WEBVTT 00:00.170 --> 00:01.010 Hello everyone! 00:01.010 --> 00:05.030 Welcome to the CFD using Openfoam Beginner to Intermediate course. 00:05.480 --> 00:09.230 This will be the first class in this class. 00:09.230 --> 00:15.890 We will be looking at the introduction to Openfoam, installation and setup of the software basic file 00:15.890 --> 00:18.650 structure and basic commands which is used in Openfoam. 00:18.830 --> 00:20.630 First, what is Openfoam? 00:20.630 --> 00:24.440 Openfoam stands for Open Field Operation and Manipulation. 00:24.560 --> 00:28.850 It is an open source software used for computational fluid dynamics, commonly known as CFD. 00:29.760 --> 00:35.430 It is designed for solving continuum mechanics problem including fluid flow, heat transfer, and chemical 00:35.430 --> 00:36.120 reactions. 00:37.020 --> 00:43.410 Initially, it was developed by open CFD limited, a company, a division of the ESI Group, first released 00:43.410 --> 00:45.060 in the year 2004. 00:45.270 --> 00:51.660 Since then continuously enhanced and maintained by the Openfoam Foundation and an active user community. 00:51.660 --> 00:55.210 So we generally say.com and.org. 00:55.240 --> 00:59.590 Version or it is also known as foundation and community version. 00:59.590 --> 01:04.180 So in this course we will be using the community version which is the essay version. 01:04.930 --> 01:12.460 So what happens is the org or foundation version they release in the format of version one. 01:12.460 --> 01:15.010 Version two and the latest one is version 11. 01:15.010 --> 01:18.270 So it is mostly like V9V ten v 11. 01:18.270 --> 01:22.410 And uh, when this course is published the latest is v 11. 01:22.410 --> 01:27.240 But ESA they do it in a slightly different format. 01:27.240 --> 01:36.540 So they release uh two versions every year, one in the month of June and one in the month of December. 01:36.540 --> 01:43.630 So you see the latest version, which is released as of this course recording is, uh, 231, two. 01:43.660 --> 01:50.110 So version two, three one to what it means is it is released in the year 23, which is 2023. 01:50.110 --> 01:54.670 And the one two means the 12th month of the year, which is December. 01:55.360 --> 01:59.290 So the previous release was version 2306. 01:59.290 --> 02:00.550 So it was in the June. 02:00.550 --> 02:01.870 So 2306. 02:01.870 --> 02:05.200 And previous to that it is obviously 2 to 1 two. 02:05.200 --> 02:06.410 And it goes on. 02:06.410 --> 02:11.570 And uh, as of this course, it is recorded in June 2024. 02:11.570 --> 02:14.570 So we are expecting 20 406 soon. 02:14.750 --> 02:17.870 We will be using 2312 for this course. 02:20.270 --> 02:26.810 Uh, features and capabilities of Openfoam wide range of solvers is present for incompressible compressible 02:26.810 --> 02:27.770 flow solvers. 02:27.770 --> 02:33.720 We also have solvers for multiphase heat transfer, combustion, chemical reaction, and everything. 02:33.720 --> 02:37.770 It is also highly customizable since it is an open source software. 02:37.770 --> 02:42.120 You can modify create your own custom solver, edit the source code. 02:42.120 --> 02:48.780 You can play around the coding as much as you want and there is no restriction and it is absolutely 02:48.780 --> 02:49.230 free. 02:49.380 --> 02:55.720 Also, there are extensive libraries for physical models and numerical methods even if it is not coming 02:55.720 --> 02:59.320 in the installation, you can download it from external websites. 02:59.320 --> 03:01.120 Contributors from GitHub. 03:01.120 --> 03:03.190 It is called form extend version. 03:03.850 --> 03:10.210 You can write your own solvers if you need, or you can use solvers written by other people in terms 03:10.210 --> 03:10.990 of openfoam. 03:10.990 --> 03:17.650 So it is highly customizable and its pre-processing and post-processing utilities are highly powerful, 03:17.650 --> 03:23.900 like the tools for mesh generation and manipulation comes within the installation, and data analysis 03:23.900 --> 03:29.210 and visualization tools can be done using a software called Paraview, which is also open source. 03:29.210 --> 03:32.390 And it comes along with the installation of Openfoam. 03:32.690 --> 03:38.180 And we can also do complex geometries and dynamic meshing where the mesh moves with respect to time. 03:38.180 --> 03:45.460 So it is also possible in Openfoam it supports structured as well as unstructured meshes capable of 03:45.460 --> 03:50.650 handling moving boundaries and mesh deformation, and also rotating meshes in many cases. 03:51.730 --> 03:56.770 So we will see how to do the installation and setup for installation. 03:56.980 --> 04:00.580 Uh, we need WSL which is called Windows Subsystem Linux. 04:00.790 --> 04:04.690 Openfoam works only in Linux system and not in windows system. 04:04.690 --> 04:09.740 But that doesn't mean we have to get a computer which is entirely booted with Linux. 04:09.980 --> 04:17.600 That is why we have something called WSL or Windows Subsystem Linux, where we get the terminal window 04:17.600 --> 04:24.620 of the Linux inside windows so that we can use a Linux subsystem within the windows. 04:25.460 --> 04:31.430 So to install that, all you have to do is open your command prompt or run as administrator. 04:31.440 --> 04:35.040 Or you can also open your PowerShell and run this command. 04:35.580 --> 04:36.840 WSL space. 04:37.200 --> 04:39.360 Hyphen hyphen install space. 04:39.360 --> 04:43.890 Hyphen D where d means the distribution version and space. 04:43.890 --> 04:46.350 You can type ubuntu with capital U. 04:46.380 --> 04:48.990 Hyphen 22.04. 04:48.990 --> 04:55.410 So what this will do is it will install the Windows Subsystem Linux along with the ubuntu version of 04:55.420 --> 04:59.980 Linux, which is 22.04 along with the installation. 04:59.980 --> 05:03.010 And you will get ubuntu inside your system. 05:03.010 --> 05:11.650 But if you know how to do a second boot second OS inside your system, then you are free to do a Linux 05:11.650 --> 05:12.220 boot up. 05:12.220 --> 05:19.630 Or if you have a spare laptop and you can afford to remove windows OS and put in Linux completely, 05:19.630 --> 05:20.810 you can also do that. 05:20.990 --> 05:25.250 So once you enter this command and hit enter, the process will start. 05:25.250 --> 05:27.230 Now wait for the process to finish. 05:27.230 --> 05:34.700 Since I have already installed it, uh, I am not installing it again, so you can just run this command 05:34.730 --> 05:35.180 now. 05:35.180 --> 05:38.780 After it is over, it will prompt you to restart your PC. 05:39.680 --> 05:42.170 Now restart your PC and wait. 05:42.410 --> 05:46.530 So you just do the next slide also. 05:46.710 --> 05:49.650 Watch the next slide and then do this process. 05:49.740 --> 05:51.180 That's what I recommend. 05:52.260 --> 05:55.830 After restarting a window named ubuntu will open. 05:56.520 --> 06:00.420 Wait till it asks you to enter your username and password. 06:00.420 --> 06:07.710 So this username and password will be your login details for your Linux system which is in Windows Subsystem. 06:08.750 --> 06:13.580 If the ubuntu terminal does not open automatically, you can also open from the search bar. 06:13.580 --> 06:19.760 You can just open your search bar and search for ubuntu and a terminal window can be opened. 06:20.180 --> 06:26.240 Note when you are typing username, you can see the username, but when you are typing the password, 06:26.240 --> 06:28.010 the password won't be visible. 06:28.010 --> 06:32.210 So you might be wondering, I am typing something but it is not visible on the screen. 06:32.210 --> 06:36.780 It won't even show the stars like how we generally do when we type a password. 06:36.780 --> 06:39.630 It will show stars, but in this case it won't show. 06:40.200 --> 06:45.090 So instead what it will do is it will keep a blank space. 06:45.090 --> 06:48.180 So when you are typing the password, type it very carefully. 06:48.180 --> 06:50.700 It need not be very highly secure. 06:50.730 --> 06:54.210 It is just for a small security purpose. 06:54.210 --> 06:57.160 It's not going to affect your overall security of your system. 06:57.760 --> 06:59.980 So keep it as simple as possible. 07:00.760 --> 07:05.290 It need not, uh, involve anything like numbers, special characters. 07:05.290 --> 07:06.670 There is nothing mandatory like that. 07:06.670 --> 07:08.680 You can keep it as simple as you want. 07:08.830 --> 07:12.970 So make sure you are typing it very carefully and hit enter. 07:14.380 --> 07:17.350 Then the installation will be done for ubuntu. 07:17.380 --> 07:22.820 Now there is a quick tip since we are talking about installation now, I would recommend you to either 07:22.820 --> 07:25.670 install Notepad Plus Plus or Visual Studio Code. 07:25.670 --> 07:31.880 Since Openfoam is open source, we will be modifying the codes to run the simulation. 07:31.880 --> 07:35.600 There is no specific graphical user interface or GUI for this. 07:35.600 --> 07:40.340 Any notepad word or any text editor for that matter would work just fine. 07:40.340 --> 07:45.960 But some specialized Ides can make your work easier and comfortable, so I recommend you to install 07:45.960 --> 07:48.510 either Notepad Plus Plus or VSCode. 07:48.540 --> 07:56.430 I would personally use VSCode because it has amazing user interface and it will help me with autofill 07:56.430 --> 07:57.240 sometimes. 07:57.510 --> 08:03.240 So if you want to follow along, same as mine, you can go with VSCode. 08:03.240 --> 08:08.220 But if you just want to settle down with notepad Plus plus it's your personal preference. 08:08.910 --> 08:09.270 Okay. 08:09.280 --> 08:11.950 now we have the XL. 08:11.950 --> 08:17.140 If you faced any issues, please do, uh, contact me or you can search on the web. 08:17.140 --> 08:23.290 There is various resources to, uh, help you on how to install WSL. 08:23.290 --> 08:24.550 It will be very easy. 08:24.580 --> 08:29.170 Now we will do the installation and setup of Openfoam version 2312. 08:29.260 --> 08:36.870 In my system I already have the 2212 version, but now I want to install the Openfoam 2312 version. 08:36.870 --> 08:41.130 So I will do that along with you so that you can also follow along. 08:41.130 --> 08:46.110 So for that we have to visit the website uh https and so on. 08:46.110 --> 08:47.670 What is there on the screen. 08:47.670 --> 08:51.510 You can also simply search Openfoam install V2312. 08:51.540 --> 08:54.120 The first link will do just fine. 08:55.290 --> 09:04.330 So what we have to do is we have to open our terminal or it is also the ubuntu terminal. 09:04.330 --> 09:06.460 So I will tell you two methods. 09:06.460 --> 09:13.180 One is click on your windows button or open the search bar and search for ubuntu. 09:13.210 --> 09:14.860 This thing will appear. 09:14.860 --> 09:18.610 You can hit enter and it will open a terminal. 09:19.960 --> 09:21.400 Just wait for it to load. 09:27.530 --> 09:29.060 Now it is loaded. 09:29.090 --> 09:31.100 This is also fine. 09:31.130 --> 09:39.110 Okay, but if it is not opening or if it is throwing an error, there is another method. 09:39.140 --> 09:45.800 You can press windows key plus R and this run window will open. 09:45.800 --> 09:49.320 You can type in W cell and hit enter. 09:50.580 --> 09:51.930 Now this will open. 09:52.230 --> 09:58.200 Even if this doesn't work you can do the windows Plus R type in cmd. 09:58.470 --> 10:00.270 This will open your command prompt. 10:00.270 --> 10:03.900 Or you can also search command prompt from here and open it. 10:03.900 --> 10:04.650 No problem. 10:04.650 --> 10:09.180 You don't have to run it as administrator, just normal command prompt is fine. 10:09.180 --> 10:12.010 And then you can type cell and hit enter. 10:12.460 --> 10:15.400 Now this will load the cell for you. 10:18.100 --> 10:19.480 Okay now I got the cell. 10:19.480 --> 10:21.310 How do I know I have the lab? 10:21.610 --> 10:24.730 Uh, my username at the device name. 10:24.730 --> 10:31.120 And we will see something like slash mnt slash the, uh, directory of this. 10:31.120 --> 10:33.130 So this is what we call the directory. 10:33.130 --> 10:38.660 The location from the base where we are working is called directory. 10:38.660 --> 10:40.340 I will use this word very often. 10:40.850 --> 10:44.060 If you are comfortable with terminal you would already know this. 10:44.060 --> 10:47.330 So the first command which will be knowing is clear. 10:47.330 --> 10:49.700 So you type clear hit enter. 10:49.700 --> 10:51.260 It will clear it okay. 10:51.260 --> 10:58.730 Now what we are going to do is um, we are going to type in these commands and we are going to run it. 10:58.730 --> 11:01.840 It will install the, uh, openfoam. 11:01.840 --> 11:07.330 But you can also go to the website which I just mentioned, and you can copy paste this entire code, 11:07.330 --> 11:11.170 but I'm going to, uh, type this out. 11:11.170 --> 11:11.770 Okay. 11:11.770 --> 11:14.230 Now what I'm going to do is I will type CD. 11:14.560 --> 11:20.170 Now, you don't have to understand what I'm doing, uh, or what these commands mean, but CD is change 11:20.170 --> 11:20.980 directory. 11:21.010 --> 11:22.930 Now it will take me to the home directory. 11:22.940 --> 11:25.010 Now we are in the home just after dollar. 11:25.010 --> 11:26.930 If we don't see anything, that is the home. 11:27.470 --> 11:28.580 Again, I will clear it. 11:28.580 --> 11:31.940 Now I will type this command whatever is there on the screen. 11:32.450 --> 11:35.450 SQL space https 11:37.310 --> 11:49.650 dll.openfoam.com/r hyphen Debian hyphen repo dot s h space state bar. 11:49.680 --> 11:55.890 I don't know what is that space sudo space space bash. 11:56.040 --> 11:57.180 I'll hit enter. 11:57.210 --> 11:59.760 Now it is asking me for the password. 11:59.760 --> 12:04.980 So I will type the password and it is running. 12:05.010 --> 12:08.850 This is the only place where we will be needing the password we just set. 12:09.390 --> 12:17.320 So it is doing apt get update which is updating what is available already and it will see if there are 12:17.320 --> 12:19.270 any updates for the system. 12:20.770 --> 12:22.450 So wait for some time. 12:22.450 --> 12:26.560 Make sure your internet is stable, only then it will be done faster. 12:26.560 --> 12:28.390 Then we can do the second command. 12:28.390 --> 12:32.980 So by the way, whatever is there after the hash, it is not needed. 12:32.980 --> 12:34.330 It is just a comment. 12:34.330 --> 12:41.090 Now we can do the second command which is sudo apt get update. 12:41.780 --> 12:45.050 Now this is also going to update whatever is done. 12:45.050 --> 12:47.270 So this is getting the update. 12:47.270 --> 12:51.410 And uh then we will install whatever update is there. 12:51.410 --> 12:52.670 It will be done automatically. 12:52.670 --> 12:53.600 You don't have to worry. 12:53.600 --> 12:58.190 Now this is the command which will actually install openfoam. 12:58.490 --> 13:04.270 It is sudo apt get install openfoam 2312. 13:04.270 --> 13:05.620 Hyphen default. 13:05.620 --> 13:08.200 So there are many methods to install. 13:08.200 --> 13:11.950 Default is going to install everything that is there. 13:12.010 --> 13:16.120 Now this is case sensitive so don't make anything capital. 13:16.120 --> 13:17.500 Everything is small here. 13:17.590 --> 13:18.310 Hit enter. 13:18.310 --> 13:21.070 Now it is going to ask you whether do you want to continue. 13:21.070 --> 13:23.980 Now you can just type why this is not case sensitive. 13:24.010 --> 13:26.270 You can type capital Y or small Y. 13:26.300 --> 13:27.410 Doesn't matter. 13:27.410 --> 13:31.250 Type Y and hit enter and keep your internet stable. 13:31.250 --> 13:35.600 This is going to take a while and it will install Openfoam for you. 13:36.440 --> 13:40.250 Now let us wait till it is over and I'll get back to you. 13:41.510 --> 13:44.060 Now the installation is over. 13:44.060 --> 13:48.170 As you can see, it is asking us to do something. 13:48.270 --> 13:58.140 It is asking us to set up Openfoam through a command called source from bashrc file dot space and this 13:58.140 --> 13:58.680 thing. 13:58.710 --> 14:06.210 Okay, so this is what is going to tell the Linux to, uh, locate Openfoam. 14:06.210 --> 14:10.590 So whenever we are calling Openfoam it has to know where Openfoam is installed. 14:10.590 --> 14:13.030 So this is the location where it is installed. 14:13.030 --> 14:15.370 So we have to source that. 14:15.370 --> 14:16.450 It's called sourcing. 14:16.450 --> 14:20.590 Before that we will check whether Openfoam is installed properly or not. 14:20.590 --> 14:24.580 So to do that you can type in the next command on the slide. 14:24.790 --> 14:29.620 It says Openfoam 2312 and hit enter. 14:29.680 --> 14:34.660 Now if you see this then your installation is done. 14:34.660 --> 14:36.010 Well okay. 14:36.010 --> 14:41.030 Now now, uh, you have to see your username dollar and, uh, blinking thing. 14:41.030 --> 14:43.460 It will also say open form two, three, one, two here. 14:43.460 --> 14:46.760 If it is saying that, then your installation is great. 14:46.760 --> 14:50.150 If you are facing any problem, do ask me. 14:50.270 --> 14:57.320 Uh, you can contact me or there are again, various, uh, resources available on the internet to sort 14:57.350 --> 14:59.630 out any issue which you are getting an installation. 14:59.630 --> 15:05.280 Most probably someone has got that before you, so you can always check it out. 15:06.180 --> 15:11.550 Now we are going to do the sourcing thing to to come out of this terminal. 15:11.550 --> 15:16.830 You can click here and probably control C or control D will work for me. 15:16.830 --> 15:17.850 Control D works. 15:17.850 --> 15:21.660 So then I am going to do something called just CD. 15:21.810 --> 15:22.530 Okay. 15:22.650 --> 15:25.050 Just to ensure that I'm in the home directory. 15:25.090 --> 15:30.910 now we are going to type explorer dot e x e space dot. 15:30.940 --> 15:34.090 Don't miss the space dot and hit enter. 15:34.570 --> 15:41.980 Okay now this window will pop up where you will be able to see something called Dot bash RC, which 15:41.980 --> 15:45.760 is the file Openfoam was talking about dot bashrc file. 15:45.970 --> 15:50.670 So just open that it will ask for permission. 15:50.670 --> 15:52.740 You can open it using VSCode. 15:52.740 --> 15:54.840 I am using VSCode to open it. 15:54.840 --> 15:58.110 Go all the way down to the last line. 15:58.110 --> 16:01.680 Actually, you won't be seeing any of these so just forget it. 16:01.680 --> 16:02.430 You will. 16:02.430 --> 16:03.690 This will be your last line. 16:03.690 --> 16:05.760 This file will be your last line. 16:05.760 --> 16:09.030 So, uh, don't mind any of this, okay? 16:09.030 --> 16:11.130 Pretend that it doesn't exist here. 16:11.520 --> 16:18.490 So what you are going to do is you are going to copy paste this entire thing. 16:18.490 --> 16:18.880 Okay. 16:18.880 --> 16:22.360 I'm just going to copy go to VS code. 16:22.360 --> 16:27.610 And in the last line of your bashrc file you are going to paste it in. 16:27.610 --> 16:29.230 In your case it will be after the. 16:29.230 --> 16:31.810 If I go to the new line and paste it. 16:31.990 --> 16:38.360 Now you are going to do something called sauce. 16:38.390 --> 16:38.870 Okay. 16:38.870 --> 16:42.140 So this will work for you. 16:42.140 --> 16:45.350 So what you have to do is you have to type sauce. 16:45.350 --> 16:50.240 Then you have to type this then save it. 16:50.750 --> 16:54.740 And then you can open a new terminal. 16:55.130 --> 17:01.220 Uh, I will be preferring to use Windows plus R and then we'll see. 17:01.220 --> 17:03.870 Now you should not get any errors here. 17:03.870 --> 17:11.190 If you are getting any error, it means that your sourcing is gone wrong somewhere. 17:11.910 --> 17:14.970 Uh, you can safely close the previous terminal. 17:14.970 --> 17:16.020 It is fine now. 17:16.020 --> 17:18.750 Only the new terminal will work with the source. 17:18.780 --> 17:24.270 Okay, so if you are, uh, if you have done it perfectly, it will not show any error. 17:24.270 --> 17:27.760 Otherwise it will show some command that it is not sourced or something. 17:28.510 --> 17:31.180 So I will also explain what I have done here. 17:31.600 --> 17:39.100 Uh, whenever you want some shortcut, let's say that I want to go to a specific area in my PC, some 17:39.100 --> 17:39.580 directory. 17:39.580 --> 17:43.300 Now it is in main slash c slash user slash Harris Jayaraj. 17:43.570 --> 17:45.130 This is my home directory. 17:45.220 --> 17:47.800 This is the directory where I am at the terminal. 17:47.980 --> 17:54.170 But if I want to go to a specific directory, say, Udemy Openfoam course. 17:54.170 --> 18:03.500 So if I want to go there, then the command is actually CD space, then the location of that folder. 18:03.500 --> 18:08.930 Then I if I just type that, let's say I'm typing specifically that. 18:08.930 --> 18:10.460 So I'll go to my home directory. 18:10.460 --> 18:19.330 Now I am typing series slash empty slash d slash openfoam V2212. 18:20.350 --> 18:25.870 Uh, Udemy Openfoam course, if I am typing, you can see that I am entering that location. 18:25.870 --> 18:31.510 But if I don't want to do that, let's say I am going to use this folder very often. 18:31.510 --> 18:34.630 Then what I can do is I will create something called alias. 18:34.630 --> 18:40.430 So if I want to enter that location, all I have to do is enter the home directory by typing in CD. 18:40.580 --> 18:42.050 Then I will type Udemy. 18:42.470 --> 18:45.350 Hit enter and it will take me there directly. 18:45.350 --> 18:49.730 So it is an alias to do specific commands. 18:49.760 --> 18:56.510 Now if you have multiple, uh, versions of Openfoam, or if you also want to do something like this, 18:56.510 --> 19:05.250 then what you can do is you can put this entire thing within a single quotations. 19:05.280 --> 19:08.340 Then after the quotation, you just type a dot. 19:08.340 --> 19:14.130 So it has to be like dot space, then the, uh, location instead of source space. 19:14.760 --> 19:18.450 Then I am going to type alias space. 19:18.450 --> 19:21.060 Then you can give whatever word you want. 19:21.060 --> 19:24.810 I am going to use of two, three, one, two for this. 19:24.810 --> 19:27.850 So whenever I type of 2312. 19:28.540 --> 19:31.720 This file or this location will be sourced. 19:31.720 --> 19:35.230 So let's say I want to use Openfoam 2 to 1 to some time. 19:35.230 --> 19:38.230 Then I can type f 2 to 1 two in my terminal. 19:40.390 --> 19:40.780 Okay. 19:40.780 --> 19:41.650 Now. 19:43.840 --> 19:50.680 If I type that then my terminal is taking me to openfoam 2 to 1 to location wherever it is installed. 19:50.680 --> 19:57.690 But if I want to work with Openfoam 231 to say I will type Openfoam 2312. 19:58.380 --> 20:01.920 Now you see it is taking me to Openfoam 2312. 20:01.950 --> 20:04.620 So that is what we are trying to do. 20:05.280 --> 20:08.040 Okay, that is what we are trying to source here. 20:08.040 --> 20:10.890 If I type F23, one two it will take me to the log. 20:10.920 --> 20:13.050 It will source it automatically. 20:13.440 --> 20:18.460 Uh sorry it is not available as of now, so I have to restart and it will work. 20:18.460 --> 20:21.670 So this is what alias Dot does. 20:21.670 --> 20:24.610 Okay, so this is what I have done here as well. 20:24.610 --> 20:27.760 Now this is what is going to work here as well. 20:27.760 --> 20:30.100 So I hope you understood. 20:30.100 --> 20:30.940 Till there. 20:32.200 --> 20:34.780 Now the next thing okay. 20:34.780 --> 20:39.580 Now we have typed in CD clear and we have also sourced this. 20:39.580 --> 20:41.990 So this is what we did till now. 20:41.990 --> 20:45.080 If you want to go through the slides you can go through. 20:45.230 --> 20:50.120 Now uh, we are going to do something called make directory. 20:50.120 --> 20:50.420 Okay. 20:50.420 --> 20:53.120 For this I will open a new terminal. 21:00.200 --> 21:03.710 Now I will source open form 2312. 21:03.740 --> 21:08.910 Now I have sourced Openfoam 2312, which is the new version which I have just installed. 21:08.910 --> 21:14.760 So whenever you have multiple versions you might have to source it manually, but if you just did the 21:14.760 --> 21:19.290 source space slash your user, then you don't have to do this line. 21:20.190 --> 21:25.890 You will find me doing this command throughout this course very often, so you can choose to do it or 21:25.890 --> 21:27.420 skip it whenever you want. 21:27.420 --> 21:37.840 So what we are going to do is create a directory mkdir space hyphen p dollar form underscore run and 21:37.840 --> 21:38.410 hit enter. 21:38.440 --> 21:42.040 What this is going to do is just like how we created alias. 21:42.040 --> 21:45.520 It is open form has its own method of creating alias. 21:45.520 --> 21:46.390 That is this. 21:46.390 --> 21:51.970 Now if I type just run it will take me to a location. 21:52.270 --> 21:52.720 Um. 21:52.720 --> 21:56.930 um, where it has created a run directory. 21:56.930 --> 22:02.120 Usually this is the place where we will be doing all the simulations. 22:02.120 --> 22:05.990 And this is generally is what is considered as a run directory. 22:05.990 --> 22:10.640 But I will suggest you to do something else, which I will tell in the next class. 22:10.640 --> 22:10.880 Okay. 22:10.880 --> 22:12.980 We will be creating our own run directory. 22:13.490 --> 22:14.000 Okay. 22:14.000 --> 22:22.860 So uh, this is what we had to do then what you can do is uh, I is instead of running, just run there. 22:22.860 --> 22:29.790 You can also run CD dollar form underscore run. 22:29.790 --> 22:30.300 Okay. 22:30.300 --> 22:37.260 Now after that, open form offers us set of tutorials which we can copy and use it whenever we want. 22:37.260 --> 22:41.160 So whenever we are working with open form, we don't set up anything from scratch. 22:41.160 --> 22:45.230 We will copy paste some of the tutorials and modify it to cater our needs. 22:45.950 --> 22:56.510 So to do that we have to type in this command and it is CP hyphen r dollar form underscore tutorials. 22:56.750 --> 23:01.730 Slash incompressible slash. 23:01.730 --> 23:03.140 Simple form. 23:03.410 --> 23:05.300 Make sure that f is capital. 23:05.300 --> 23:10.050 It is case sensitive, so make sure everything is set properly. 23:10.350 --> 23:11.070 It's. 23:13.200 --> 23:14.250 Daley. 23:17.490 --> 23:20.610 Space dot and hit enter. 23:20.760 --> 23:21.570 Okay. 23:21.570 --> 23:26.010 Now previously when I typed LHS, we did not see anything like here. 23:26.220 --> 23:30.760 But now when I type LHS, you can see that we have something called pits daily. 23:30.760 --> 23:32.410 This is what we just copied. 23:32.410 --> 23:36.940 So CP is copy command hyphen R is copy recursively. 23:36.940 --> 23:39.850 So it means that whatever file is there inside pits daily. 23:39.850 --> 23:40.930 Copy that also. 23:42.220 --> 23:43.990 Now we have copied that also. 23:43.990 --> 23:55.730 But now uh I will ask you to do something like CP hyphen r dollar form underscore to Tory else space 23:55.730 --> 23:55.970 dot. 23:55.970 --> 23:57.230 Don't miss this dot. 23:57.710 --> 23:59.060 Then hit enter. 24:01.010 --> 24:02.300 It is going to take a while. 24:07.400 --> 24:11.540 Now if you type ls you can also see something called tutorials. 24:11.570 --> 24:20.640 Now this tutorials is uh main folder which I was telling you Like we have various solvers here. 24:20.640 --> 24:23.940 We will be using these tutorials to set up our cases. 24:23.940 --> 24:27.090 We won't set up it, set it up from scratch. 24:27.090 --> 24:28.200 We will just use this. 24:28.200 --> 24:28.740 Okay. 24:29.550 --> 24:33.930 So we have a, uh, created something called the Pitch Daily here. 24:33.930 --> 24:38.670 This is the way to check whether your installation is done properly or not. 24:38.670 --> 24:42.030 Now we are going to enter the Pitch Daily folder. 24:42.030 --> 24:45.520 It is the command CD space pitch daily. 24:45.520 --> 24:47.230 Make sure that this is capital. 24:47.320 --> 24:51.100 Hit enter now if you want to see what is there inside, you can type ls. 24:51.280 --> 24:54.070 You have zero constant and system. 24:54.070 --> 24:57.250 You don't have to worry what these things mean as of now. 24:57.280 --> 25:01.150 Now the command which you have to run next is block mesh. 25:01.150 --> 25:04.810 So I am just following whatever is there in the PPT. 25:05.080 --> 25:05.560 Okay. 25:05.770 --> 25:07.170 Now block mash. 25:07.170 --> 25:07.950 Hit enter. 25:07.980 --> 25:10.170 You have to see something called end. 25:10.170 --> 25:11.670 Here it will you. 25:11.670 --> 25:12.630 You don't have to. 25:12.660 --> 25:15.240 You should not see any warning word here. 25:15.240 --> 25:17.730 It will be ending smoothly with end. 25:17.820 --> 25:22.830 Then the next command is simple form. 25:23.580 --> 25:24.300 Hit enter. 25:25.020 --> 25:25.410 Now. 25:25.410 --> 25:26.910 Wait till this is over. 25:33.070 --> 25:36.010 It will take a bit of time, but it will be over soon. 25:38.950 --> 25:41.440 Okay, now again you are seeing something called N. 25:41.440 --> 25:42.430 Now this is over. 25:42.430 --> 25:48.820 What we have done is we have just simulated a backward facing step case. 25:48.820 --> 25:49.510 Okay? 25:49.600 --> 25:53.020 And we will be typing something called para form. 25:53.020 --> 25:55.970 This is the way to do the post-processing. 25:55.970 --> 25:58.940 This might or might not work for you. 25:58.940 --> 26:01.160 Like it did not work for me, right? 26:01.160 --> 26:05.870 Because it might or might not work for some people. 26:05.870 --> 26:08.120 So you don't have to worry about that. 26:08.120 --> 26:11.660 So what we will be doing is we will be installing something called Paraview. 26:12.380 --> 26:13.700 So what is Paraview? 26:13.760 --> 26:17.780 Paraview is the open source data analysis and visualization tool. 26:17.780 --> 26:22.980 It is developed by a company called Kitware and various institutions in collaboration. 26:23.070 --> 26:26.730 So the key features is it handles a large data sets. 26:26.730 --> 26:31.110 It can be used for any sort of scientific computation, not just Openfoam and CFD. 26:31.530 --> 26:36.870 It has an interactive 3D visualization platform and it is scriptable via Python. 26:36.870 --> 26:42.300 If you want to automate things or if you want to make it customizable, you can do it using Python and 26:42.300 --> 26:44.650 using Paraview along with Openfoam. 26:44.980 --> 26:48.460 It is very powerful to post-process all our data. 26:48.460 --> 26:52.090 We can perform operations like slicing, contour plots, stream line. 26:52.090 --> 26:57.310 If you want to do a graph over specific line on the geometry, you can do that. 26:57.310 --> 27:01.960 If you want to export the data within some cells in the mesh, you can do that. 27:02.350 --> 27:05.350 It has a wide variety of capabilities. 27:05.350 --> 27:07.360 So we are going to install Paraview. 27:08.030 --> 27:13.130 So the method to do it is we will be going to this website paraview.org. 27:13.130 --> 27:15.740 And you can download the latest version. 27:15.740 --> 27:21.380 You can install it install the software in your C drive in the default location. 27:21.440 --> 27:24.320 Now we are going to do something. 27:24.320 --> 27:26.420 I will type ls. 27:26.420 --> 27:29.750 As you can see we have zero 100 202 81. 27:29.750 --> 27:31.130 These are the time steps. 27:31.460 --> 27:38.740 Now we have to run a command called touch space para dot phone hit enter. 27:38.920 --> 27:42.910 Now what this essentially does is it created a file called para dot phone. 27:43.180 --> 27:44.710 This is the para view file. 27:44.710 --> 27:47.230 Now I have installed para view already. 27:48.010 --> 27:55.030 So what I'm going to do is I'm going to type explorer dot x space dot hit enter. 27:55.090 --> 27:59.030 It will take me to the location where these files are existing. 27:59.060 --> 28:00.560 Now we will be seeing this. 28:00.560 --> 28:07.790 So just right click open with choose another app. 28:09.020 --> 28:11.900 Then you can click on Choose app on your PC. 28:13.100 --> 28:20.420 If you scroll down you will be able to see this paraview whatever you wherever you have installed so 28:20.430 --> 28:22.770 you will be able to see Paraview. 28:22.770 --> 28:24.780 So this is my previous version. 28:24.780 --> 28:25.830 This is my new version. 28:25.830 --> 28:28.680 So I am double double clicking the new version. 28:28.680 --> 28:33.660 So whatever you have installed you will be able to see that double click inside bin. 28:34.410 --> 28:38.730 If you just scroll down you will be able to see Paraview and application file. 28:42.720 --> 28:44.250 See this is an application file. 28:44.250 --> 28:45.520 So click on this. 28:45.520 --> 28:49.390 Click on open and make sure to give always. 28:50.410 --> 28:52.570 Now this will load us the case files. 28:53.380 --> 28:55.690 It will take a bit of time for the first time. 29:04.660 --> 29:13.130 So once I clicked the green apply here you might be able to see something like this in terms of geometry, 29:13.130 --> 29:14.930 but the colors might be different. 29:14.960 --> 29:21.230 Okay, so the color map might be different, but as long as it looks similar it is fine. 29:21.260 --> 29:28.820 So if you go here you will be able to choose between velocity pressure or k epsilon nu t. 29:29.030 --> 29:35.640 We will be seeing what these are and how these got generated later, But for now you are just going 29:35.640 --> 29:37.920 to check whether the installation works fine or not. 29:38.790 --> 29:42.660 And this is the interface where we will be changing the times. 29:42.660 --> 29:48.210 As you can see, we have 100 to 100 and 281 since this is a steady state case. 29:48.210 --> 29:52.830 So we are interested only in the last time step where it got converged. 29:53.370 --> 29:53.640 Okay. 29:53.640 --> 29:55.560 So this is the pressure data. 29:56.070 --> 29:58.370 We have the velocity data. 29:58.370 --> 30:05.270 So if you click this button it is going to uh take all the data within this window. 30:05.270 --> 30:09.650 And uh set the minimum and maximum to the color map accordingly. 30:10.670 --> 30:14.990 So I'll this is called rescale to visible data range. 30:14.990 --> 30:16.070 I have selected that. 30:16.070 --> 30:18.530 So this is what we have just simulated. 30:18.530 --> 30:20.750 This is a backward facing step case. 30:20.750 --> 30:23.940 If I click here it will run me through the time step. 30:23.940 --> 30:27.120 But this is a steady state simulation so it doesn't matter. 30:27.690 --> 30:29.280 Now I can close this. 30:29.490 --> 30:35.430 If I go back to the terminal it will be uh, just like how we left it. 30:35.520 --> 30:38.490 Okay, now we will see what is left. 30:38.790 --> 30:40.110 We have done this. 30:40.110 --> 30:42.630 Your color might look something like this. 30:42.630 --> 30:45.240 I have changed the color map for my preference. 30:45.240 --> 30:49.240 Okay, now we will see what is the file structure and basic commands in Openfoam. 30:49.840 --> 30:52.150 So we have a case okay. 30:52.330 --> 30:58.120 A case is the setup which we will be using to run any simulation. 30:58.660 --> 31:01.810 So the case has three different parts. 31:01.810 --> 31:03.850 One is time directories. 31:03.970 --> 31:10.730 Then there is a folder called constant which will store all the constant values or properties related 31:10.730 --> 31:11.810 to the simulation. 31:12.230 --> 31:19.340 And then we have a folder called system, which will store all the control related things, which is 31:19.340 --> 31:20.780 related to the simulation. 31:21.170 --> 31:29.000 Under time directories will be having zero, uh, and after that it will progress as the time step. 31:29.000 --> 31:34.320 If your time step is 0.1, then after zero we will have 0.1, 0.10.20.3. 31:34.320 --> 31:40.950 If a time step is 0.001, then it will be 00.0.001, 0.002, and so on. 31:41.700 --> 31:42.900 So you get the point. 31:42.900 --> 31:52.230 So all these zero files will have corresponding velocity pressure temperature uh and uh pressure minus 31:52.230 --> 31:53.580 the hydrostatic forces. 31:53.580 --> 31:55.410 So all these files will be there. 31:55.740 --> 32:01.960 And in the constant folder Generally we have the mesh here which is stored in the format called poly 32:01.960 --> 32:02.230 mesh. 32:02.230 --> 32:08.560 We will be having a folder called poly mesh under which we will be having the point cell faces boundary 32:08.560 --> 32:09.160 details. 32:09.460 --> 32:14.290 After that we will have various properties like turbulence properties, transport properties which will 32:14.290 --> 32:19.180 have the uh fluids, kinematic viscosity and turbulence model. 32:19.180 --> 32:25.050 Turbulence properties will have the turbulence details like whether it is laminar or Reynolds averaged 32:25.200 --> 32:27.060 simulation or whatever it is. 32:27.600 --> 32:33.120 Under system we will be having the control dict which will be controlling the application, which will 32:33.120 --> 32:35.250 be using all the solver which we will be using. 32:35.970 --> 32:44.250 Any external function, user defined function to plot any data or if you want to change the time step, 32:44.490 --> 32:46.200 uh, start time, end time. 32:46.200 --> 32:51.160 Anything anything related to simulation or setup we will be doing through the control dict. 32:51.160 --> 32:57.640 If we scheme and if we solution correspond to the numerical schemes which will be using to generate 32:57.640 --> 32:58.090 the data. 32:58.090 --> 33:00.730 So we have various CFD numerical schemes. 33:00.730 --> 33:03.910 And we will be setting up those through those two files. 33:03.910 --> 33:12.410 Block mesh dict is a file which will be useful in generating mesh basic mesh snap A hex mesh can be 33:12.410 --> 33:15.380 used for generating complex meshes. 33:15.380 --> 33:19.220 So these are the general files under these folders. 33:19.220 --> 33:24.350 But usually there will be more files which is not uh generic. 33:24.350 --> 33:27.110 So we are not plotting it in this chart. 33:27.710 --> 33:36.240 So some of the useful commands are uh, these I will demonstrate by typing it okay. 33:36.840 --> 33:38.490 So first is LHS. 33:38.670 --> 33:40.050 LHS will do list. 33:40.050 --> 33:47.250 So it will list whatever um folder is there in that specific directory. 33:47.250 --> 33:52.050 Let's say I want to then the second command is CD space the name of the folder. 33:52.050 --> 33:54.390 So that is what I am going to do CD space. 33:54.390 --> 33:58.020 Now here I have Openfoam as one of my folders. 33:58.020 --> 34:04.120 So if you want to autofill, you just type first 1 or 2 letters and hit tab. 34:04.120 --> 34:05.680 It will auto fill for you. 34:05.770 --> 34:06.400 Hit enter. 34:06.400 --> 34:09.250 Now you can see that I am inside Openfoam. 34:09.460 --> 34:14.890 Now if I want to go back, what I will do is I will do CD space dot dot. 34:15.100 --> 34:16.330 It will take me back. 34:16.540 --> 34:18.100 Now for demonstration. 34:18.100 --> 34:19.660 I'll go back inside. 34:20.050 --> 34:23.410 Now, as you can see, I have four folders here. 34:23.680 --> 34:26.750 Uh, let's say I want to go into the fourth file. 34:26.750 --> 34:29.870 Now it's asking me to choose the one. 34:30.560 --> 34:33.110 I am choosing it and hitting enter. 34:33.290 --> 34:35.150 Okay, now under this I have run. 34:35.180 --> 34:41.780 Now, let's say if I want to go back to the home again, either I can do CD and hit enter. 34:41.780 --> 34:51.970 It will always take me to home, or else if I want to do let's say I am like very further into this. 34:52.420 --> 34:53.080 Okay. 34:53.170 --> 34:56.140 Now I just want to go back to folders. 34:56.140 --> 35:02.350 I will do CD space dot dot slash dot dot for coming out of two folders. 35:04.060 --> 35:10.720 And if I want to come out of three folders what I will do is CD space dot dot dot dot slash dot dot. 35:11.170 --> 35:13.430 It will take me back by three folders. 35:13.460 --> 35:15.500 Okay, I'll clear it. 35:16.100 --> 35:20.090 Now touch is a command which will create files. 35:20.090 --> 35:23.360 So generally we will use it to create paraview files. 35:23.630 --> 35:27.380 Let's say I have these three okay I will go back to my home. 35:27.380 --> 35:29.630 We have only open form now okay. 35:29.660 --> 35:36.320 Now I will create the paraview file here touch base para dot form I'll hit enter and search. 35:36.330 --> 35:37.230 What is there? 35:37.350 --> 35:40.080 You can see I have parrot form file. 35:40.440 --> 35:40.980 Okay. 35:40.980 --> 35:42.270 Now if you want to create. 35:42.270 --> 35:43.350 This is for creating a file. 35:43.350 --> 35:49.530 Now if you want to create a folder then you can use mkdir which basically means make directory. 35:50.160 --> 35:53.700 And I can type in the folder name let's say folder. 35:54.630 --> 35:54.810 Okay. 35:54.810 --> 36:00.210 Now when I type ls you can see we have two folders open form and folder which we just created. 36:00.820 --> 36:04.540 Now if you want to enter folder yeah I will enter. 36:04.540 --> 36:09.310 Now let's say I want to remove the folder okay. 36:09.310 --> 36:13.300 The folder which I just created it is r m hyphen r. 36:13.540 --> 36:15.370 Then I will type the folder name hit enter. 36:15.370 --> 36:17.800 Now if I search the folder is not there. 36:17.800 --> 36:22.780 If I want to remove the paraview file, I'll just do rm and it is also gone. 36:22.780 --> 36:26.030 So generally for folders we will be using hyphen. 36:26.030 --> 36:26.420 Ah. 36:26.420 --> 36:30.620 But um we will not be using it to delete files. 36:30.620 --> 36:38.000 Now explorer dot exe will generally open just your Windows Explorer okay. 36:38.000 --> 36:45.350 But if we want to open it in the specific location let's say I am inside Openfoam. 36:45.350 --> 36:48.500 Here I am in version 2212. 36:48.800 --> 36:52.290 And this I am under, uh, tutorials. 36:54.270 --> 36:55.290 Okay, I am under run. 36:55.290 --> 36:55.770 Okay. 36:55.770 --> 36:57.870 Now if I see there is nothing inside. 36:57.870 --> 37:00.240 But I just want to open this location. 37:00.240 --> 37:04.260 What I'm going to do is explorer dot x space dot. 37:04.260 --> 37:08.160 So that space dot means open it in this location. 37:08.160 --> 37:09.960 So dot means this location. 37:09.960 --> 37:17.810 It's a second parameter input I'll hit enter and as you can see it is exactly opening that location. 37:18.410 --> 37:20.510 So that is how that command is useful. 37:20.540 --> 37:23.600 So these are the basic commands which we will use very often. 37:23.630 --> 37:29.570 Apart from this we are not going to use much uh, which is related to Linux directly. 37:29.570 --> 37:31.370 So these are Linux commands. 37:31.370 --> 37:37.550 We will be using more commands which is related to openfoam which we will learn as the course progresses. 37:37.740 --> 37:39.360 So that's it for this video. 37:39.360 --> 37:43.020 If you have any questions, feel free to contact me. 37:44.550 --> 37:47.580 Um, there is a big openfoam community online. 37:47.580 --> 37:53.370 If you have any doubts, first try to check it online so you will be learning more than what you just 37:53.370 --> 37:57.870 need because you will be seeing, uh, problems from other people also. 37:57.870 --> 37:59.550 So you will learn more. 38:00.270 --> 38:00.960 Thank you. 38:00.960 --> 38:02.400 See you in the next class.