Difference between revisions of "OpenFOAM/C2/Supersonic-flow-over-a-wedge/English-timed"
From Script | Spoken-Tutorial
(Created page with "{|border=1 | '''Time''' | '''Narration''' |- | 00:01 | Hello and welcome to the spoken tutorial on '''Supersonic flow over a wedge using OpenFOAM''' |- | 00:07 | In this tu...") |
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| − | | Inlet velocity is '''5 meters per second''' | + | |The Inlet velocity is '''5 meters per second''' |
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| − | | In the '''terminal''' type path for '''supersonic flow''' over a '''wedge''' | + | | In the command '''terminal''' type path for '''supersonic flow''' over a '''wedge''' |
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| − | | '''cd tutorial - '''Press Enter '''cd compressible - '''Press Enter '''cd rhoCentralFoam - '''Press Enter | + | | '''cd tutorial - ''' and Press Enter '''cd compressible - ''' and Press Enter '''cd rhoCentralFoam - ''' and Press Enter |
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|02:02 | |02:02 | ||
| − | | '''cd wedge15Ma5 | + | | '''cd wedge15Ma5 ''' |
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| 02:54 | | 02:54 | ||
| − | | To view'''blockMeshDict file''' type '''gedit''' space''' blockMeshDict''' note that '''M and D '''here are capital | + | | To view'''blockMeshDict file''' type '''gedit''' space''' blockMeshDict''' note that '''M and D '''here are capital press enter |
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| − | | In this you need to '''calculate''' the '''co- | + | | In this you need to '''calculate''' the '''co-ordinate''' for the wedge |
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| 03:23 | | 03:23 | ||
| − | | The rest of the data | + | | The rest of the data remains the same |
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|03:29 | |03:29 | ||
| − | | In '''boundary patches''' | + | | In '''boundary patches''' boundaries are set as shown in the figure |
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| 03:33 | | 03:33 | ||
| − | | Close | + | | Close '''blockMeshDict file''' |
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| 04:02 | | 04:02 | ||
| − | | This contains initial boundary condition for '''pressure,velocity and | + | | This contains the initial boundary condition for '''pressure,velocity and Temperature''' |
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| 04:32 | | 04:32 | ||
| − | | Now to view the geometry in the '''terminal ''''''type paraFoam''' and press enter This will open the '''paraview''' window | + | | Now to view the geometry in the ''' command terminal ''''''type paraFoam''' and press enter This will open the '''paraview''' window |
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| 04:53 | | 04:53 | ||
| − | | In this you can see the '''geometry''' | + | | In this you can see the '''geometry''' in which the '''rectangular''' '''section upstream''' changes to a '''wedge downstream''' Close the '''paraview''' window |
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| 05:49 | | 05:49 | ||
| − | | Again on the left hand side of '''object inspector menu | + | | Again on the left hand side of '''object inspector menu click '''APPLY''' |
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| 05:56 | | 05:56 | ||
| − | | On the left side top in '''active variable control menu''''''you will see a drop down menu showing solid color.''' Now click on it '''And change from solid color to capital U''' | + | | On the left hand side top in '''active variable control menu''''''you will see a drop down menu showing solid color.''' Now click on it '''And change from solid color to capital U''' |
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| 06:14 | | 06:14 | ||
| − | | Now make the '''color legend ON''' by clicking on left hand side top of '''active variable control menu''' and make the '''color legend ON''' '''click on it''' | + | | Now make the '''color legend ON''' by clicking on the left hand side top of '''active variable control menu''' and make the '''color legend ON''' '''click on it''' |
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| 06:28 | | 06:28 | ||
| − | | On top of the ''' | + | | On top of the '''Paraview window''' you can see the '''VCR control''' Click on '''PLAY''' |
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| 06:42 | | 06:42 | ||
| − | | Now scroll down the '''properties''' in '''object inspector menu''' on left hand side Now click on '''display''' besides '''properties''' | + | | Now scroll down the '''properties''' in '''object inspector menu''' on the left hand side Now click on '''display''' besides '''properties''' |
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| − | | Type '''Mach | + | | Type '''Mach''' |
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| 07:48 | | 07:48 | ||
| − | | Click '''APPLY''' scroll down.In '''volume fields''' '''Check''' the '''Ma '''box and click '''APPLY''' | + | | Click '''APPLY''' scroll down.In '''volume fields''' '''Check''' the '''Ma'''box and again click '''APPLY''' |
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| 08:04 | | 08:04 | ||
| − | | On top of''' active variable control menu''' click on '''Solid Color''' and change it to '''Ma''' | + | | On top of the''' active variable control menu''' click on '''Solid Color''' and change it to '''Ma''' |
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| 08:11 | | 08:11 | ||
| − | | In the '''VCR control''' menu click on '''PLAY''' and make the '''color legend ON''' | + | | In the '''VCR control''' menu again click on '''PLAY''' and make the '''color legend ON''' |
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Revision as of 15:13, 24 November 2015
| Time | Narration |
| 00:01 | Hello and welcome to the spoken tutorial on Supersonic flow over a wedge using OpenFOAM |
| 00:07 | In this tutorial I will show you How to solve a compressible flow problem of supersonic flow over a wedge How to post process the results in paraView. |
| 00:18 | To record this tutorial I am using Linux Operating system Ubuntu version 10.04
OpenFOAM version 2.1.0 ParaView version 3.12.0 |
| 00:30 | To practice this tutorial a learner should have some basic knowledge of Compressible flows andGas Dynamics |
| 00:38 | Let us now solve supersonic flow over a wedge using OpenFOAM and see the shock structure formed using paraview |
| 00:47 | The problem consists of a wedge with semi-angle of 15 degrees kept in a uniform supersonic flow |
| 00:55 | The Inlet velocity is 5 meters per second |
| 01:00 | The boundary conditions are set as shown in the figure |
| 01:05 | The type of solver I am using here is rhoCentralFoam |
| 01:10 | It is a Density-based compressible flow solver It is based on central- upwind schemes of Kurganov and Tadmor |
| 01:21 | Open a command terminal to do this press ctrl +alt+ t keys simultaneously on your keyboard |
| 01:28 | In the command terminal type path for supersonic flow over a wedge |
| 01:35 | In the terminal Type 'run' and press enter |
| 01:40 | cd tutorial - and Press Enter cd compressible - and Press Enter cd rhoCentralFoam - and Press Enter |
| 02:02 | cd wedge15Ma5 |
| 02:13 | This is the name of the folder of supersonic flow over a wedge in rhoCentralFoam and press enter |
| 02:21 | Now type ls and press enter |
| 02:24 | You will see three folders : 0,constant and system. |
| 02:29 | Now open the blockMeshDict file,to do this |
| 02:34 | type cd space constant and press enter |
| 02:41 | cd space polyMesh note that M here is capital and press enter |
| 02:49 | Now type ls and press enter you can see the blockMeshDict file |
| 02:54 | To viewblockMeshDict file type gedit space blockMeshDict note that M and D here are capital press enter |
| 03:08 | let me drag this to the capture area scroll down |
| 03:14 | In this you need to calculate the co-ordinate for the wedge |
| 03:20 | This has been already calculated and set up in the problem |
| 03:23 | The rest of the data remains the same |
| 03:29 | In boundary patches boundaries are set as shown in the figure |
| 03:33 | Close blockMeshDict file |
| 03:36 | in the command terminal type cd ..(dot dot) twice to return back to wedge folder |
| 03:45 | Now Open the 0 folder |
| 03:51 | To do this type cd space 0 and press enter |
| 03:58 | Type ls and press enter |
| 04:02 | This contains the initial boundary condition for pressure,velocity and Temperature |
| 04:10 | Type cd .. (dot dot) and press enter.Now we need to mesh the geometry |
| 04:19 | To do this in the command terminal type blockMesh and Press Enter Meshing has been done |
| 04:32 | Now to view the geometry in the command terminal 'type paraFoam' and press enter This will open the paraview window |
| 04:45 | On the left hand side of object inspector menu click APPLY |
| 04:53 | In this you can see the geometry in which the rectangular section upstream changes to a wedge downstream Close the paraview window |
| 05:05 | Now run the solver 'rhoCentralFoam' |
| 05:11 | To do this in the command terminal type rhoCentralFoam and Press Enter |
| 05:20 | The iterations running can be seen in the terminal window |
| 05:24 | Iterations running will stop after it converges or at the end of the time step Now the solving has been done |
| 05:34 | To visualise these results let us open the paraview window once again |
| 05:40 | In the command terminal type “paraFoam” and press Enter |
| 05:49 | Again on the left hand side of object inspector menu click APPLY |
| 05:56 | On the left hand side top in active variable control menu'you will see a drop down menu showing solid color. Now click on it And change from solid color to capital U' |
| 06:14 | Now make the color legend ON by clicking on the left hand side top of active variable control menu and make the color legend ON click on it |
| 06:28 | On top of the Paraview window you can see the VCR control Click on PLAY |
| 06:37 | You can see the final results of U velocity |
| 06:42 | Now scroll down the properties in object inspector menu on the left hand side Now click on display besides properties |
| 06:56 | Scroll down and click on Rescale to Size You can see the final value of Velocity magnitude |
| 07:05 | Similarly you can select pressureYou can see the final result of pressure Now close the paraview window |
| 07:16 | You can also calculate the Mach number for the flow To do this we can use the Openfoam utility by typing Mach in the command terminal |
| 07:26 | Type Mach |
| 07:29 | Note that M here is capital and press enter.You can see that Mach number is calculated for each time step |
| 07:36 | Now again open the paraview window.By typing in the command terminal paraFoamand press enter |
| 07:48 | Click APPLY scroll down.In volume fields Check the Mabox and again click APPLY |
| 08:04 | On top of the active variable control menu click on Solid Color and change it to Ma |
| 08:11 | In the VCR control menu again click on PLAY and make the color legend ON |
| 08:21 | You can see the Mach number in the color legend and corresponding colours |
| 08:29 | We notice here that when the wedge is kept in supersonic flow it produce a shock across which the flow properties like temprature, pressure and density drastically changes |
| 08:43 | Now Let me switch back to the slides' The solved tutorial can be validated with exact 'solution |
| 08:50 | available in basic books of Aerodynamics by John D Anderson |
| 08:55 | In this tutorial we learnt: Solving a compressible flow problem
Velocity and pressure contour for the wedge OpenFOAM utility for calculating the Mach number |
| 09:06 | As an Assignment Vary the wedge angle between 10 ° to 15 ° to view the shock characteristic for the flow |
| 09:14 | This bring us to the end of tutorial watch The video available at this URL: http://spoken-tutorial.org/What_is_a_Spoken_Tutorial |
| 09:21 | It summarizes the Spoken Tutorial project. If you do not have good bandwidth, you can download and watch it. |
| 09:28 | 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 us at contact@spoken-tutorial.org |
| 09:41 | Spoken Tutorials project is part of Talk to a Teacher project, It is supported by the National Mission on Education through ICT, MHRD, Government of India. More information on the same is available at the following URL link http://spoken-tutorial.org/NMEICT-Intro |
| 09:56 | This script has been contributed by Arvind M and this is Rahul Joshi from IIT BOMBAY signing off.Thanks for joining. |
