WEBVTT 00:00.200 --> 00:01.280 Hello everyone! 00:01.280 --> 00:07.490 In this tutorial we will be seeing how to make a case from Openfoam tutorial. 00:07.490 --> 00:08.810 So openfoam. 00:08.810 --> 00:12.620 When it is installed, it comes with a set of tutorials. 00:12.740 --> 00:19.070 As we are working with something which is open source, we don't have to build everything from scratch. 00:19.070 --> 00:27.110 We will have some examples and we can make our own case with those examples as a base case. 00:27.110 --> 00:31.360 So in Openfoam those examples are commonly known as tutorials. 00:32.080 --> 00:40.660 So we will see how we can take tutorial folders or case files and modify it for our own purpose and 00:40.660 --> 00:42.580 uh, run our own simulation. 00:42.580 --> 00:48.520 So to locate your, uh, tutorials folder, all you have to do is first source your open form. 00:48.520 --> 00:52.510 If you don't have multiple versions, you can skip till now. 00:52.510 --> 00:55.170 So from now it will be very common. 00:55.170 --> 00:58.560 So you can be in any directory okay. 00:58.560 --> 00:59.880 So it doesn't matter. 01:00.570 --> 01:06.060 Now you can type CD dollar form underscore tutorials okay. 01:06.060 --> 01:11.610 If you type this you will go to the location where those tutorial cases are there. 01:11.610 --> 01:16.350 Now you can type explorer dot x space dot hit enter. 01:17.250 --> 01:18.890 Location will open. 01:19.220 --> 01:26.090 If you see here there is a lot of tutorials, so the most common ones are like heat transfer, incompressible 01:26.090 --> 01:28.340 and compressible and multiphase. 01:28.460 --> 01:29.330 In most cases. 01:29.930 --> 01:32.750 So if you see we have the incompressible folder. 01:32.750 --> 01:37.070 If I go inside that you will be able to find all the solvers. 01:37.070 --> 01:41.930 So these are case files will be separate for every solver. 01:41.930 --> 01:46.500 If you see these many solvers are there for incompressible cases. 01:46.650 --> 01:52.200 So the most popular ones are icofom, pimple foam and simple foam. 01:52.260 --> 01:56.940 So if you go inside simple foam again you will find a lot of tutorials. 01:57.630 --> 02:02.640 So these are the base tutorials through which you can build your own case. 02:02.730 --> 02:04.860 Having this as a reference. 02:04.950 --> 02:13.400 So we also have pimple foam where again it comes in terms of laminar large eddy simulation or Arias 02:13.400 --> 02:13.970 model. 02:14.030 --> 02:17.630 So if I go inside laminar we have these many tutorials. 02:17.750 --> 02:21.050 And if I go into alias we have some tutorials. 02:21.410 --> 02:27.140 And if I go into Arias which is Reynolds averaged Navier-Stokes, we have these many tutorials again. 02:28.040 --> 02:28.370 Okay. 02:28.370 --> 02:35.860 So if I go into Icofom again we have these many tutorials under cavity. 02:35.860 --> 02:39.610 Also I have multiple different cavity tutorials. 02:39.790 --> 02:40.210 Okay. 02:40.210 --> 02:43.900 So if you see uh, let's take Icofom case. 02:43.900 --> 02:47.350 If I go here I have zero constant system folder. 02:47.350 --> 02:54.460 So under everything we will have the block mesh decomposed part if we skim a few solution everything. 02:54.460 --> 02:58.920 So if you see uh a icofom it is always laminar. 02:59.070 --> 03:02.820 So we won't have the, uh, turbulent properties files. 03:02.820 --> 03:10.410 So all you can do is you can copy this and paste it wherever you want and go to your terminal, navigate 03:10.410 --> 03:11.220 to that location. 03:11.220 --> 03:12.840 Then you can run your simulation. 03:12.840 --> 03:13.380 Okay. 03:14.280 --> 03:20.940 But if you are using something like pimple foam, uh, let's take our case, okay. 03:20.940 --> 03:22.910 Because in Icofom we saw the laminar. 03:22.910 --> 03:29.990 So if you take this case in simple form, uh, let's take very simple thing like T junction. 03:29.990 --> 03:30.530 Okay. 03:30.710 --> 03:35.930 If you see here we have got zero constant and system. 03:35.930 --> 03:38.900 We have block mesh scheme of solution and controlled it. 03:38.900 --> 03:40.490 All necessary files are there. 03:40.640 --> 03:42.050 It is a very simple case. 03:42.050 --> 03:46.100 If you go under constant you will be able to find turbulence properties. 03:51.160 --> 03:54.130 See we have these turbulence properties here. 03:54.130 --> 03:56.170 It is saying it is using k epsilon. 03:56.680 --> 04:00.430 So we will be seeing a video on how to model k omega SST. 04:00.640 --> 04:05.440 But I will not touch upon k epsilon or spalart-allmaras turbulence models. 04:06.160 --> 04:11.010 So instead what you can do is you can refer to tutorials like this. 04:11.040 --> 04:11.370 Okay. 04:11.370 --> 04:12.690 It uses k epsilon. 04:12.870 --> 04:19.230 And if you go here in zero you can find uh there is epsilon folder k. 04:19.230 --> 04:20.940 Is there new T is there. 04:20.940 --> 04:26.220 Also you have new tilde which means you can also use spalart-allmaras in this case. 04:26.220 --> 04:31.410 So these will be covered when we are seeing arrays turbulence models. 04:31.590 --> 04:35.460 But as of now I'm just saying how to make use of those tutorials. 04:35.660 --> 04:42.080 Okay, now let's say we have a simple form and as usual, we have pitched daily case. 04:42.080 --> 04:50.000 Okay, now when you are trying to build upon a case, let's see what this turbulence model is. 04:51.530 --> 04:52.010 Okay. 04:52.010 --> 04:54.080 They have k epsilon by default. 04:54.080 --> 04:57.500 So we are not going to change these tutorials. 04:57.500 --> 05:02.370 Because if you are making any change to the tutorial at all, you can't use it again, right? 05:02.370 --> 05:08.820 So what you will do is you will copy this folder to some location and then use it. 05:09.300 --> 05:11.010 So we will see how to do that. 05:11.010 --> 05:13.950 I'll go to some location okay. 05:13.950 --> 05:19.890 Now let's say mostly we will do all the things in one directory so you can run and it will take you 05:19.890 --> 05:21.390 to the run directory. 05:21.390 --> 05:23.430 Now we will copy the pitch daily case. 05:23.430 --> 05:29.630 So the command is CP hyphen r dollar form underscore tutorials. 05:29.630 --> 05:33.350 So this will point to this folder. 05:33.350 --> 05:37.310 Now under tutorials we have to go inside incompressible. 05:38.600 --> 05:41.270 So I will go inside incompressible. 05:41.270 --> 05:44.300 Under incompressible we have to go into simple form. 05:44.300 --> 05:46.190 So simple form. 05:46.190 --> 05:48.380 Then under that we have. 05:49.180 --> 05:50.650 it's daily. 05:50.650 --> 05:58.960 If I am not wrong, yes, we have pitched daily and we want to copy this entire folder with the name. 05:58.960 --> 06:01.360 So just space and dot hit enter. 06:02.170 --> 06:06.520 Okay, now we have copied the folder I will do ls. 06:06.520 --> 06:11.920 Now you can see we have Pitch daily and the tutorials folder. 06:11.920 --> 06:14.340 Now I will go inside pitch daily. 06:14.340 --> 06:19.110 And if you see we have the zero constant and system which means we can't run the case. 06:19.110 --> 06:22.470 So for example I can do block mesh. 06:22.470 --> 06:24.090 Now I can run. 06:24.810 --> 06:27.030 Let me drag this simple form. 06:30.390 --> 06:33.540 And I can do touch dot form. 06:34.050 --> 06:37.230 And what I can do is I will open this location. 06:40.220 --> 06:43.070 And as you can see, we have all the case files here. 06:43.070 --> 06:48.740 So this is the way which we will use to modify any tutorials. 06:48.740 --> 06:53.450 Now let's say you want everything from the page daily like you want. 06:53.450 --> 06:56.660 The boundary names all seem okay. 06:57.860 --> 07:03.660 So you want the mesh like inlet outlet, upper wall wall and front and back only. 07:03.930 --> 07:08.370 And you want the same in p uh k epsilon everything. 07:08.370 --> 07:13.410 And even in constant you want the turbulence property to be the same or maybe different. 07:13.410 --> 07:19.740 But if you want the same thing, and if you just want to make the mesh different, then you can copy 07:19.740 --> 07:27.210 this case because it already has the method to implement k epsilon turbulence model and spalart-allmaras. 07:27.210 --> 07:27.230 Spalart-allmaras. 07:27.230 --> 07:30.680 So you can take this and modify as you want it. 07:30.890 --> 07:31.310 Okay. 07:31.310 --> 07:35.720 So if you want to change the mesh, you can do if you want to change the control dict, you can do. 07:35.720 --> 07:38.720 If you want to change the boundary files, you can do. 07:38.720 --> 07:41.060 So everything comes with the template right. 07:41.060 --> 07:47.210 So if you open the velocity file you can see it comes with the template of these things with these headers. 07:47.210 --> 07:50.000 And you don't want to type all of these from scratch. 07:50.690 --> 07:57.130 So always copy from a tutorial which is as close as your, uh, case which are trying to set up, and 07:57.130 --> 07:58.120 you can modify it. 07:58.120 --> 08:01.480 I wouldn't copy a pimple from case to run a steady state case. 08:01.480 --> 08:01.630 Right. 08:01.630 --> 08:08.920 So I can copy something from pimple form if I, if I want to just, uh, run, uh, a transient case 08:08.920 --> 08:20.520 and using terminal to copy using this command is just one method, Say I have a folder. 08:20.550 --> 08:27.720 Okay, now let's say I have this folder, and I'm just making something called run. 08:27.720 --> 08:28.110 Okay. 08:28.110 --> 08:30.420 Now I want to run the case here. 08:30.420 --> 08:33.540 So what I will do is I can go to incompressible. 08:33.540 --> 08:40.710 Now let's say I want to run the cavity case I'll go to or better I will take the elbow case I'll copy 08:40.710 --> 08:41.390 the elbow. 08:41.690 --> 08:43.910 Go here, paste it here. 08:43.910 --> 08:44.180 Okay. 08:44.180 --> 08:47.690 So you can use the Windows Explorer if you are in windows. 08:47.690 --> 08:53.120 And then you can run it like for example I will go to that location. 08:53.720 --> 08:58.340 Now I am in the location under which I have run okay. 09:01.220 --> 09:03.140 So we have elbow here. 09:05.270 --> 09:05.630 Okay. 09:05.630 --> 09:11.080 Now I can run whatever is needed so you don't worry about the all run and all clean file here. 09:11.080 --> 09:14.290 We will, uh, learn about that in later video. 09:14.290 --> 09:17.680 For now, we can see that many things are there here. 09:17.680 --> 09:22.240 So you just want to run this case, then you can load it. 09:22.510 --> 09:24.490 Then from the terminal, you can run it. 09:24.490 --> 09:26.230 Now I'm not going to run it. 09:26.470 --> 09:28.240 So it was just for demonstration. 09:28.240 --> 09:30.600 So this is what you can do Okay. 09:30.600 --> 09:33.240 So always make a copy and then do it. 09:33.270 --> 09:36.030 Don't change the tutorial folders. 09:36.060 --> 09:39.240 That would be not a good idea to do so. 09:39.240 --> 09:46.770 This tutorial is all about looking at the tutorials folder and copying a case and trying to simulate 09:46.770 --> 09:47.010 it. 09:47.010 --> 09:51.630 So I hope now you understand how to use the tutorial folder. 09:51.630 --> 09:54.180 So if you see here we have a lot. 09:54.180 --> 09:59.560 For example we have the multiphase uh under multiphase we have a lot of solvers. 09:59.560 --> 09:59.830 Okay. 09:59.830 --> 10:01.420 So all of these are solvers. 10:01.570 --> 10:05.260 And if you go into compressible again we have a lot of solvers. 10:05.260 --> 10:07.810 Under each solver we will have many tutorials. 10:07.810 --> 10:10.600 So you can watch over these tutorials. 10:10.600 --> 10:18.700 And once we understand what these uh, all run and all clean files are, then you will also know what 10:18.700 --> 10:23.430 are the set of commands which you have to run to run the simulation. 10:23.430 --> 10:28.170 All the tutorials won't have block mesh and then run a simple form. 10:28.170 --> 10:30.000 So it all depends on a lot of things. 10:30.000 --> 10:37.500 There are many things, uh, many manipulation of the case, like setting a, uh, setting a field in 10:37.500 --> 10:43.620 a multiphase case, just setting one part of the entire mesh to one specific phase of the fluid. 10:43.620 --> 10:44.930 So these things are there. 10:44.930 --> 10:47.540 The for that we'll be using something called set fields. 10:47.990 --> 10:49.430 And there is a set dict. 10:49.430 --> 10:50.810 So there are a lot of things. 10:50.810 --> 10:56.300 So when you are not sure about how to run a case that's where all run file will help you. 10:56.300 --> 11:00.500 So we will look into that later in the course. 11:00.920 --> 11:06.200 But for now, I just hope you understood how to use the tutorials folder and the resources Openfoam 11:06.200 --> 11:07.340 offers you through it. 11:07.610 --> 11:08.300 Thank you. 11:08.300 --> 11:09.440 See you in the next class.