Difference between revisions of "OpenFOAM/C3/Flow-over-a-flat-plate/English-timed"
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| In this tutorial, I will teach you about: | | In this tutorial, I will teach you about: | ||
| − | + | Geometry of the flat plate | |
| − | + | Changing the grid spacing in '''meshing''' | |
| − | + | Postprocessing results in '''ParaView''' and | |
| − | + | Visualizing using '''Vector Plot'''. | |
|- | |- | ||
| 00:19 | | 00:19 | ||
| To record this tutorial, I am using: | | To record this tutorial, I am using: | ||
| − | + | '''Linux Operating system Ubuntu''' version 12.04. | |
| − | + | '''OpenFOAM''' version 2.1.1 and | |
| − | + | '''ParaView''' version 3.12.0 | |
| − | + | ||
| − | + | ||
| − | + | ||
|- | |- | ||
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| 01:15 | | 01:15 | ||
| − | |Then go to the 'run' directory. You will see 'Tutorials'. Click on it. | + | |Then go to the 'run' directory. You will see 'Tutorials'. Click on it. Scroll down and then click on '''Incompressible.''' Scroll down. |
| − | Scroll down and then click on '''Incompressible.''' Scroll down. | + | |
|- | |- | ||
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| 07:26 | | 07:26 | ||
| This brings us to the end of the tutorial. In this tutorial, we learnt: | | This brings us to the end of the tutorial. In this tutorial, we learnt: | ||
| − | + | '''Geometry''' and '''meshing''' of the '''flat plate geometry''' and | |
| − | + | Vector plotting in '''ParaView'''. | |
|- | |- | ||
| 07:37 | | 07:37 | ||
| − | | As an Assignment- | + | | As an Assignment- Create a '''geometry''' of '''flow over a flat plate'''.Refine the '''grid spacing''' near the plate. |
| − | Create a '''geometry''' of '''flow over a flat plate'''. | + | |
| − | Refine the '''grid spacing''' near the plate. | + | |
|- | |- | ||
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| 07:55 | | 07:55 | ||
| The Spoken Tutorial Project team: | | The Spoken Tutorial Project team: | ||
| − | + | Conducts workshops using spoken tutorials. Gives certificates to those who pass an online test. | |
| − | + | ||
For more details, please write to: '''contact@spoken-tutorial.org''' | For more details, please write to: '''contact@spoken-tutorial.org''' | ||
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| 08:17 | | 08:17 | ||
| − | |More information on this mission is available at this URL: | + | |More information on this mission is available at this URL:http://spoken-tutorial.org/NMEICT-Intro. |
| − | http://spoken-tutorial.org/NMEICT-Intro. | + | This is Rahul Joshi from '''IIT Bombay''', signing off.Thanks for joining. |
| − | This is Rahul Joshi from '''IIT Bombay''', signing off. | + | |
| − | Thanks for joining. | + | |
|} | |} | ||
Revision as of 18:46, 20 February 2017
| Time | Narration |
| 00:01 | Hello and welcome to the spoken tutorial on Flow over a flat plate using OpenFOAM. |
| 00:06 | In this tutorial, I will teach you about:
Geometry of the flat plate Changing the grid spacing in meshing Postprocessing results in ParaView and Visualizing using Vector Plot. |
| 00:19 | To record this tutorial, I am using:
Linux Operating system Ubuntu version 12.04. OpenFOAM version 2.1.1 and ParaView version 3.12.0 |
| 00:30 | Flow over flat plate is a fundamental problem in fluid mechanics. |
| 00:35 | We can visualize the growth of the boundary layer. Boundary layer is a very thin region above the body |
| 00:41 | where the velocity is 0.99 times the free stream velocity. |
| 00:46 | This is a diagram of flow over the flat plate. |
| 00:49 | The boundary conditions are given as follows.
You have the Inlet, the Plate, Top – which is the Farfield and Outlet – which is the pressure outlet boundary. |
| 01:00 | The Free stream velocity U = 1 m/s and we are solving this for Reynolds number (Re) = 100. |
| 01:08 | Now let us go to the home folder. In the home folder, click on the OpenFoam folder. |
| 01:15 | Then go to the 'run' directory. You will see 'Tutorials'. Click on it. Scroll down and then click on Incompressible. Scroll down. |
| 01:27 | You will see the 'simpleFoam' folder. Click on it. This solver suits our case. |
| 01:34 | In this, create a folder by the name flatplate. Right click - Create New Folder - flatplate. |
| 01:44 | Now, let's open the pitzdaily case. |
| 01:47 | Let me zoom this. Copy the three folders - 0, constant and system. Copy this. |
| 01:56 | Now let us go one level back. Paste these three folders inside the flatplate folder. |
| 02:05 | Open the constant folder and then the polyMesh folder. |
| 02:10 | Change the geometry and boundary condition names in the blockMeshDict file. |
| 02:15 | I have already made the changes. Let us open the blockMeshDict file . Scroll down. The geometry is in meters. |
| 02:25 | We have set the dimensions of the flatplate. |
| 02:29 | We can see the simpleGrading. It is kept as (1 3 1) as we need a finer mesh near the plate. |
| 02:35 | Now close this. Go two levels back. |
| 02:41 | Similarly, make changes in the boundary condition names inside the files in the '0' folder. |
| 02:48 | These files have pressure, velocity and wall functions. |
| 02:54 | To calculate the values of wall functions, please refer to the earlier tutorial in the OpenFoam series. Let us go one level back. |
| 03:03 | The system folder can be kept default. Let us close this. |
| 03:09 | Now let us open the terminal window. In the terminal window, type "run" and press Enter. |
| 03:16 | Type cd space tutorials press Enter. |
| 03:21 | Type cd incompressible press Enter. |
| 03:25 | Type cd space simpleFoam press Enter. |
| 03:31 | Now type "ls" and press Enter. |
| 03:34 | We can see the flatplate folder. |
| 03:37 | Now, type cd space flatplate and press Enter. |
| 03:42 | Now type "ls" and press Enter. |
| 03:45 | You can see the three folders 0, constant and system. |
| 03:49 | Now, we will mesh the geometry. We are using a course mesh for this problem. Meshing can be done by typing blockMesh in the terminal. |
| 03:58 | Press Enter. Meshing has been done. |
| 04:01 | Note that if there is some error in the blockMesh file, it will be shown in the terminal window. |
| 04:07 | To view the geometry, type “paraFoam”, press Enter. |
| 04:13 | After the ParaView window opens, on the left hand side of the object inspector menu, click Apply. |
| 04:21 | We can see the geometry. Close the ParaView window. Let me switch back to the slides. |
| 04:28 | The solver we are using here is simpleFoam. SimpleFoam is a steady state solver for in compressible and turbulent flows. |
| 04:37 | Let me switch back to the terminal window. In the terminal window, type "simpleFoam" and press Enter. |
| 04:45 | You will see the iterations running in the terminal window. |
| 04:51 | Once the solving is done, type "paraFoam" to view the results. |
| 04:55 | On the left hand side of the Object Inspector menu, click Apply to view the geometry. |
| 05:01 | Scroll down the properties panel of the Object Inspector menu for time step, regions and fields. |
| 05:08 | To view the contours from the top drop down menu, in the Active Variable Control menu, change from solid color to capital 'U'. |
| 05:19 | You can see the initial condition of the velocity. |
| 05:23 | Now on top of the ParaView window, you will see the VCR control. |
| 05:28 | Click on the Play button. |
| 05:33 | You will see the contour of Pressure or Velocity on the flat plate accordingly. |
| 05:39 | This is the velocity contour. Toggle on the Color legend. |
| 05:43 | To do this, click on the color legend icon on the Active Variable Control menu. |
| 05:50 | Click Apply in the Object inspector menu. |
| 05:53 | In the Object inspector menu, click on Display. |
| 05:57 | Scroll down and click on Rescale to data range. |
| 06:03 | Let me shift this Color legend on top to visualize the Vector Plot. Go to the Filters Menu > Common > Glyph. |
| 06:15 | Go to the Properties in Object Inspector menu. |
| 06:20 | Click Apply on the left hand side of Object Inspector menu. |
| 06:24 | You can change the number of vectors by changing their size at the bottom. |
| 06:29 | Also, the size of the vectors can be changed by clicking on the Edit button. The Set Scale Factor can be changed to 0.1. |
| 06:41 | Again, click the Apply button. |
| 06:44 | Now let me zoom this. |
| 06:46 | To do this, in the Active Variable Control menu, click on zoom To Box option |
| 06:52 | and zoom over any area that you desire. |
| 06:58 | We can see the parabolic variation of the vector plots as the flow moves over the plate. |
| 07:04 | Delete this. Now delete the vector plot. |
| 07:09 | Also, we can see that the color near to 1 corresponds to the velocity of 0.99 times the free stream velocity. |
| 07:17 | You can also plot the variation of velocity along the X and Y axes using the plot over data line. |
| 07:26 | This brings us to the end of the tutorial. In this tutorial, we learnt:
Geometry and meshing of the flat plate geometry and Vector plotting in ParaView. |
| 07:37 | As an Assignment- Create a geometry of flow over a flat plate.Refine the grid spacing near the plate. |
| 07:45 | Watch the video available at this URL: http://spoken-tutorial.org/What_is_a_Spoken_Tutorial
It summarizes the Spoken Tutorial project. If you do not have good bandwidth, you can download and watch it. |
| 07:55 | The Spoken Tutorial Project team:
Conducts workshops using spoken tutorials. Gives certificates to those who pass an online test. For more details, please write to: contact@spoken-tutorial.org |
| 08:08 | Spoken Tutorial project is a part of the Talk to a Teacher project. It is supported by the National Mission on Education through ICT, MHRD, Government of India. |
| 08:17 | More information on this mission is available at this URL:http://spoken-tutorial.org/NMEICT-Intro.
This is Rahul Joshi from IIT Bombay, signing off.Thanks for joining. |
