 So please fill in your attendance and then we will go ahead with our next session, which is the hand-on training session for running a test case, square driven cavity. This session will be primarily taken by our team member, Mr. Abushan Regni. Hello Abushan. Yeah, so in the next session we are going to do hands-on session using spoken tutorial. So you are going to do your first simulation in open form. That simulation is going to be on a square-driven cavity. So it's a cavity that is being driven by a velocity at the very top. So what I'm going to do is I'm going to provide a link of one of our spoken tutorials. It will take you, I think, around 50 minutes to complete it. And if you run into any problems, we'll be there to solve your problems. And at the very end, I'm going to do it myself as well. So if you are stuck, don't worry. I'll be showing you how to do this at the very end after 15 minutes. And a general instruction. If you are using WSL, instead of Get It, Get It isn't text editor, by the way. You can use notepad.exe if you are using WSL. So I'm going to give the link of the spoken tutorial that you have to use. So just click on this link and watch the video and you can parallelly do the simulation in open form. So now I'm going to start the time. I will give you guys around 50 minutes to do this. It should be done within 50 minutes. And if you have any problems, just hold on and type us in the chat. We have our team members, Binaik and Krishna and myself. We will try to solve your queries. And after the 15 minutes, I'm going to show you how it's done. You guys can start. So the link is in the chat box. All of you are requested to please open the chat box and click on the link. And start doing following whatever you instructed. For any queries, you can unmute and ask. First you try and if you face any issues, you can always unmute and ask your query. Or you can also post your query in the chat box if you have issues in your microphone. Hello. Yes, please go ahead. Ma'am, this control alt command is not working for me. So which terminal is to be opened like CMD or PowerShell or something else? So I think you might have installed WSL Ubuntu, right? Yes, sir. So you have to open that Ubuntu. That is your terminal. Ubuntu, right, sir. Okay, sir. Yes. Thank you, sir. Excuse me. Yes, Divya. Like I'm getting an error saying missing destination file operand after opt. Like when I use cp command. Missing. Sorry. Can you tell the... I'm getting a missing... Okay. So file operand after opt. So I think you have typed the command wrong. That means you have not given the destination file. At the very end of that copy command, there is a dot. A dot. So I think you missed that dot. Is that so? Now I'm getting an error saying no search for directory. So I think you have typed the spelling of the command wrong. I'm going to type that... Paste that command in the chat window. Yes, sir. You can just copy from there. Yes, sir. Thank you. Excuse me. Yes, Vignesh. Sir, actually I need to find the system folders. Cavity folder 0 with 0 and constant. I have to open that folder. So you have open 0 and constant folder, right? Yes, open it. I need to edit in that, right? So I think you are in some directory right now. You must be either inside 0 or inside constant directory. Maybe you have to get out. Okay, sir. You can get out of that 0 or constant directory by doing cd space dot dot. Sir, I will open that file now, sir, for block mesh. Okay, sir. Thank you. Yeah. Hello. Yes, sir. So I am facing problems, sir, opening that folder. So the tutorial folder, sir. What is the error that you get while trying to open it? No such file on the directory. Okay. So have you copied the file? Yes, sir. So while copying, did you get any error or while opening the file, did you get any error? Sorry, actually showing that no such file is in the directory. Okay. Are you sure you have typed the spelling of those directories, correct? Yes, sir. You can also copy it from the command that I just typed in the chat window. The space minus R. If that is working, can you take that, whether that is working or not? Sir, cannot start tutorial no such file in the directory. It is showing like that, sir. Okay. So whatever your command that tutorial and compressible, this I have to paste on that. Okay. Yeah. You have to copy the tutorial file for the CP space dash R, the command. Can you try that command and tell me whether it is working or not for you? Hello. Yes, sir. Is there any way to view the mesh created by the block most? So, okay. There is a way. Have we installed pair of you, right? I told you to install pair of you. Yes. Okay. There is a way to view it. Don't worry. I'll show you at the end of this tutorial system. Okay. Okay. But I hope you might have done maybe all those tutorial things, right? You might you run the command and then you are able to simulate it, right? Okay. Yeah. Just make sure that you do that and we are going to be together. Okay. Yes, Calvin. Okay. I have installed open form version 10. Okay. So, the command like form tutorials. I am getting the missing destination file of friend after that. So, I think even in the open boom Taven, the commands should work. Okay. Either you have missed something or the spelling is wrong. This makes you that at the very end of that command, there is a space and a dot. Okay. Okay. Okay. I'll check it. Okay. Hello. Yes. I mean, while I'm typing the command notepad.exe, cavity, system, block, mess, dict, dollar sign is not coming after entering. Without dollar, it is coming. And in a tutorial, it is a dollar there. So, sorry. While typing what, what come on again? Notepad.exe, cavity, system, block, mess, dict. In tutorial, there is dollar after entering, but. Okay. What come on? Okay. Just see this. Can you just type that either in the chat box? Oh, you can start at the screen. Okay. That is nice. See, you are in the run directory and notepad.exe, cavity, system, block, mess, dict. You might have, there is a notepad.exe that is open somewhere, right? Okay. You need to close that. Okay. Then. Yeah. How do I access that tutorial? Gidit, cavity. So, if you have a double SL, you don't have a Gidit. You can also, but right now you can use notepad.exe. When I'm not using notepad.exe, then permission denied. Yeah. That is, you don't need to. Okay. Okay. You can use notepad.exe and it will open the notepad. Gidit is also like a notepad. It is a text editor. Then I have to close the notepad. Yeah. Yeah. You have to close the notepad. Okay. So, this is for everyone while typing the command next year that your spelling is correct. I have been seeing that some of the few of the students have typed your command wrong while doing the CP command. Excuse me, sir. Yes, Manan. I'm not able to install actually the open form after the step four as per the instruction given in the sheet. Can you please help? So, right now I think it's too late to help to install open form. So, I think I want you to write us to other mail ID that was given to the chat. Okay, sir. Contact SEFD. So, you are installing open form seven, right? Yes, sir. So, you are installing open form seven from Ubuntu, but it's not working. We are using virtual box. So, virtual box. Okay, what, which is the version of virtual, I mean, Ubuntu have installed in your virtual box? Just a second, sir. 18.04. So, I think it should work. Why didn't you like check all the commands? In that step two, there are actually two commands. Do you like both of those commands one by one in step two? Yes, sir. I have done that. Okay. What is the, what either do you get when you try to install open form? Sir, actually I'm getting error in step four. Up till step three, it's correct. And then I'm getting error in step four. When I write SUDO, AP, whatever this command is, install open form seven. Okay, yeah. Then I get an error stating that unable to correct problems you have to help broken packages. Okay. So, why didn't you go through this step one more time from step two? Okay. Okay. So, there's a two command actually in step two. Just make sure that you decided. Okay. Okay, I'll try. Thank you. And if you still have problems, just write to us. Okay. Thank you, sir. Sir, same problem here. Okay. This right to us. I already mailed you. Okay. Okay. This is the open form 1706 for my project work. Okay. But now I'm trying to install open form seven, but having the error like a little fetch some website, some website is coming, website name. Okay. I just mailed you. Okay. You can just mail to us. I'll try to solve the problem. Okay. So, when it is you are saying. Western 1706 supports. Yeah. Yeah. Can I use 1706 for this? You can use it. Yeah. Okay. Thank you. Thank you. This is getting blocked mistake is not working. If you're trying to use block miss command, it is not blocking state. It is just blocking this. So, I think that you are using get it. We have said time to time again to use not bad. EXE if you're using the place and so anyway, it's already 17 minutes. I think those partisan participants who have completed the tutorial. Can they raise their hand so that I can get an idea how many of you have are able to complete. Okay. We have few raised hands. Okay. If you have completed your tutorial, you can raise your hand. Okay. So now you can load your hand. I'm going to show you guys how to do it. If you have not been able to do it, don't read this. Follow me. Since this is your first tutorial, you can just follow me and in your next tutorial, you can do it yourself. Okay. I have saved my screen. I hope my screen is visible. Can anyone confirm? Yes, it is visible. Okay. So let me start with our first command that is to go to the run directory. So I'm going to CD from run and this will get me to the run directory. You can check whether you are in your run directory or not by taking a look at this slash, slash things here. So it says that I'm in run. That means I'm in currently I'm in run directory. So now what I'm going to do is I'm going to copy the tutorial cavity from form tutorials for that. I'm going to use this command cp dash r then dollar form tutorials. There is a trick to it to not if you don't want to make any spelling mistake after typing half of the line, you can press tab and this terminal will complete it for you. Now if I press tab, it's going to complete my sentence like form tutorials. Again, I'm going to stress and I'm going to do incompressible. I'm not going to type all incompressible. I'm just going to press tab. Okay. Yeah. Okay. Now I'm going to type income and I'm going to when I press tab, see it all automatically completed incompressible for me. So now I'm going to type I go for and then cavity and then cavity again. And after the cavity, I need to place a space then a dot. This dot means that I want to copy this file into the current directory that is run directory. Now when I press enter, the command is completed. Now if I do LS, you can see that I have a file cavity in my run directory. So now to get into this cavity, I'm going to type this command CD cavity. So this will get me inside the cavity. You can see that here I was only until run. Now I have it on and cavity. This means I'm inside my cavity folder. Okay. Now let's see what is in the block miss. So if you are using open to, you might want to use get it virtual box. You might want to use get it and then system and then block mistake. But since most of you guys are using WSL and in WSL get it is not installed by default. You have to use notepad.exe. Okay. So if you use notepad.exe and space and system and slash and block miss dict, you will get block miss dict file. So I hope you can see my block miss dict file, right? Yes, sir. Okay. So as you can see, these are the vertices of my cavity. So since cavity is square, right? We are doing simulation on square cavity. So these are the vertices of each point of the cavity. And this is my block. You'll learn about this in the next session. More right now, I'm just going to provide you a brief description on what is this. So this is the block. I am using one block to mess my geometry. And I'm saying that I will divide my geometry into 20 halves in the x direction and 20 halves in the y direction. And in the z direction, I'm going to only provide one division. That means there is no division in z direction since this is a 2D simulation. And this is the boundary. So at the very top, I'm providing a moving wall. And apart from top on my left, right and bottom, I am using fixed walls. This is just a name. I'm providing the name fixed walls. And I'm assigning those walls to the fixed walls. And in front and back, since this is a 2D simulation, we have to provide empty. You will get into this more detail in the next session. So don't worry about it if you don't understand it right now. So I'm going to close my block miss dict file. And I'm going to do LS. So in my cavity, inside cavity, I have zero constant and system. In zero folder, we will have our initial conditions and boundary condition. And constant, we have properties of the fluid and turbulence properties first thing. And inside system, we have files that controls our simulation. So let's see what is inside our zero folder. So when I do LS space zero, it will show me the content of inside my zero folder. That is U and P. So we have U and P inside our zero folder. Let's see what is inside the U. So to do that, I'm going to type notepad.exe and then zero and then slash and then U. So this will open a notepad and it has contents of the U. So U stands for velocity and it contains boundary condition and internal field, which is the initial condition of my velocity. So in the moving wall, that is at the top, I am providing a velocity one meter per second in the x direction. If I were to provide in y or z direction, I would have value over here also. But right now the wall is only moving in the x direction. So there is only one. And in fixed wall, that is in other walls, I'm giving no sleep boundary condition. That means there is a friction involved or viscosity involved in the other three walls. And the front and back is kept empty since this is a 2D simulation. So now I'm going to close this. So let's see what is inside the pressure. That is file P. So I'm going to notepad.exe and then zero slash and then P. So when I do that, you can see that I have moving wall, fixed wall and front and back. Front and back is given empty as usual. And we are giving zero gradient boundary condition for our moving and fixed wall. So now let's see what is inside constant. So inside constant, we have transport properties. It contains fluid properties. Let's see what is inside it. I'm going to type notepad.exe and then constant and then transport properties. You don't have to type though all the command. You can just type trans and then press tab. It will automatically complete it for you. So we see this is a viscosity parameter, kinematic viscosity of our fluid that is being provided here. I'm going to close this. Now let's see what is inside system. So inside system we have block nested. We have already seen block nested. It contains information on geometry. We have control tick, FB scheme and FB solution. FB schemes contains information about what kind of schemes that we have used to discretize our equation, governing equation. The same equation that you just saw in the previous lecture. In FB solution you have information on residuals and the way how the discretized equation is being solved. Now let's see what is inside the control tick. So I'm going to type notepad.exe and then system and then control tick. So here initially there's information on application. That means what solver are we using to solve our problem? Where is in ICO form this time? So it is listed as ICO form and the start time is given 0 second. So the simulation will begin from the 0 second and it will end at 0.5 seconds. And we also need to provide time step since this is a transient simulation and the transient simulation is 0.005. Now I'm going to close this. So now I'm going to start the simulation. So the command before starting the simulation, I need to mess the geometry. So I'm going to mess it by typing block allusion. Can you once show me the block mesh? My code is slightly different so I need to just type. So you need not to be worried if your code is slightly different. Depending on the version, there may be slight changes. I think at last I merged my patch. That would have been better. Okay, what do you have here? I like it's not there. Okay, it doesn't matter because we are not using merge patch pair here. If you were to use merge patch pair here, there would be something in here. Since it is not here, the open form is just ignoring it right now. So if you don't have it, you need not to worry about it. So now before starting the simulation, I'm going to mess my geometry. So I'm going to type block mess. So this will mess my geometry. As you can see something is happening. It has messed my geometry. Now to run the simulation, I'm going to type command icofoam. So when I press enter, it will start my simulation. And my simulation is complete. Since it's a very simple simulation, it will fleece very fast. Now, in order to view the result that you have just obtained, just carefully type this command below. I want you to write this command down because you will be using this command every now and then. If you have open to a virtual box, you can just type paraform. And this would open a paraform window like this. But since most of you guys are using SSL and you don't have a graphic enabled in your SSL, you have to go through some other route to visualize the result. So just write this command somewhere and type with me. The first command is dot result dot form. Just carefully write this command somewhere because you will be using this every now and then. It is dot space result dot form. So when I press enter, it will create a file in my directory cavity. So if I do ls, I have a file named result dot form. And this contains using this file, I can view my simulation result. Now, I want you guys to open this directory using file explorer. To do that, you have to type this command explorer.exe and then space and dot. I want you guys to also write this command somewhere because you will be using this command very often. Again, the command is explorer dot exe space dot. Now, when I press enter, it will open the directory in my file explorer. And this is that result dot form file. If you are doing it for the first time, you won't get this icon of Parabue in your result dot form because the windows doesn't recognize that you have Parabue installed right now. So for that, just carefully follow me. Do a right click and press on open with and choose another app. Since I have already opened this using previously using Parabue, I have Parabue option, but you might not have Parabue. Just scroll down and click on choose an app on your PC. I hope everyone is following me. I'll just wait here for a while. Just wait. After open Parabue, what we have to write? Is it touch? What is it? It is touch space result dot form. I just show me the code. Touch space result dot form. Yeah. Okay. Thank you. Okay. You did it right. Once again, I'm going to pause here for a little time. And after this command, you have to give this command explorer dot exe space dot. Write this command down somewhere in the paper. I hope all of you have done this. Till now here. Right. So after that, you will suppose to go here when you do the explorer dot exe space dot. This window will open. I'm sorry. Just show me that again. Yeah. Okay. Okay. Sir, can you scroll a little bit of the last command of the formation? So command for missing is block miss. I'm just typing it here. Thank you, sir. Sir, can you show me what to do after the opening the result form? Okay. Yeah. I'm going to show it. I hope everyone has cast on till now. Just give me a yes. So you have, you guys have followed me here till now, right? Yeah, sir. Here, like my, it is not showing para view app. So it's like blank. Yeah. Yeah. Exactly. At the very first, you will get a blank thing. So for that, to get this pair of you, what you have to do is right click on this thing. Yeah. So more options. Sorry. I click on this thing and click on open with and choose another app. Okay. Okay. So here. Yeah. So here also you won't get a para view thing. Yes, sir. Here it is not there. So you have to scroll down and click on choose an app on your PC. Okay. Okay. Yes, sir. Everyone is following me till now. I'm going to click on this, choose an app on your PC. Then para view 5.11. Yeah. So now after clicking on choose on an app on your PC, what you have to do is you have to go to this PC, click on see and click on program files. Yeah. And then somewhere here you have to find para view. You can just click a file and type P in your keyboard. You will get a para view. Okay. And inside the para view, you have to go to this bean folder. Bean folder. Yeah. Yeah. And here you can find the para view application. Yeah. Yeah. And then click on open. Yes. And click on always. Once you do that, click on always. Yeah. So when you do that, it will open your para view window. And first thing you have to do is click on apply. Click on apply. Yeah. Okay. At your left over here. Yeah. Yeah. I got this. Yeah. Okay. Now you can view your results. So if you go here at this top left, you can see a P written over there. Yes. You can switch it to velocity V. You. Yeah. And you can go to the final time step by clicking on this last frame. 0.5. You click on this. It will show you the results that was obtained in your last frame. So this is the velocity counter. And if you want to see pressure counter, you can just click on P. And this is how you view your simulation result in para view. I hope everyone was able to follow. What is that 0.5 time? I'm not getting it. This is the time step. Okay. But earlier it was showing 0.1. So. I mean. Yeah. It's okay because that was 0.1. Then it fully moved to 0.2, 0.3 and 0.5 depending on your time step. So I think we're done here this simulation session. I hope everyone was able to follow this. Sir, can you, did you just step through the time? Can you step through the time steps and see the. Yeah. So this is just the beginning in the end. Are there intermediary time steps? Yeah, this is an intermediate time step. This is a very simple simulation. So right now you won't see any changes. Okay. Later on when you do a more complex simulation, you'll be able to see detailed changes with a time step. Okay. Okay. I'm going to wrap up this session because we have our next session from Professor Hari Krishna. That is an introduction to meshing where you learn how the meshing in the CFD is done.