Tutorial:Supersonic flow over a wedge using OpenFOAM
Script : Arvind N
Narration: Rahul Joshi
Keywords: Video tutorial,CFD,Wedge,Mach number,Compressible flows.
|Slide 1||Hello and welcome to the spoken tutorial on Supersonic flow over a wedge using OpenFOAM|
|Slide 2: Learning Objectives|| In this tutorial I will show you
| Slide 3:
| To record this tutorial, I am using
| Slide 4:
The tutorials were recorded using the versions specified in previous slide.
Subsequently the tutorials were edited to latest versions.
To install latest system requirements go to Installation Sheet.
| Slide 5:
| To practice this tutorial a learner should have some basic knowledge of
| Let us now solve
|Slide 6 : Boundary Conditions||The problem consists of a wedge with semi-angle of 15 degrees kept in a uniform supersonic flow.|
|Inlet velocity 5m/s||Inlet velocity is 5 meters per second|
|Boundary conditions as shown in the figure||The boundary conditions are set as shown in the figure.|
|Slide 7 : Solver||The type of solver I am using here is rhoCentralFoam.|
| It is a Density-based compressible flow solver.
|Switch to the Terminal by Ctrl+Alt+T|| Open a command terminal .
|In the terminal type path for supersonic flow over a wedge.|
| In command terminal:
Type run and press Enter.
|In the terminal type 'run' and press Enter.|
|Type cd tutorial and press enter||Now type cd tutorial - Press Enter.|
|Type cd compressible - Press Enter||cd compressible - Press Enter.|
|Type cd rhoCentralFoam - Press Enter||cd rhoCentralFoam - Press Enter.|
|Type cd wedge and press enter||cd wedge15Ma5|
| This is the name of the folder of supersonic flow over a wedge in rhoCentralFoam.
And press Enter.
|Type ls||Now type ls and press Enter.|
|You will see three folders : 0,constant and system.|
|Type cd constant and press enter|| Now open the blockMeshDict file.
|Type cd polyMesh and press enter|| cd space polyMesh
|Type ls and press enter|| Now type ls and press Enter.
|Type gedit blockMeshDict and press enter|| Type gedit space blockMeshDict.
Note that M and D here are capital and press Enter.
|Drag and scroll down.|| Let me drag this to the capture area.
|enter the data in vertices but it i already set up in the problem|| In this you need to calculate the co-ordinates for the wedge.
|The rest of the data remain the same.|
|Boundary names similar to that in slide 5||In boundary patches the boundaries are set as shown in the figure.|
|Close the blockMeshDict file.|
|Type : cd .. (twice) and press Enter >> wedge folder|| In the command terminal, type
cd ..(dot dot) twice to return back to the wedge folder.
|Now open the 0 folder.|
|Type cd 0 and press enter||To do this type cd space 0 and press Enter.|
|type ls and press enter||Type ls and press Enter.|
|This contains initial boundary condition for pressure,velocity and temprature.|
|type cd .. and press enter||Type cd .. (dot dot) and press Enter.|
|Now we need to mesh the geometry.|
| Mesh the geometry.
| To do this in the command terminal,
type blockMesh and press Enter.
|Terminal : type paraFoam and press enter|| Now to view the geometry in the terminal, type paraFoam and press Enter.
|Paraview window||On the left hand side of object inspector menu click APPLY.|
|About wedge geometry|| In this you can see the geometry is which is a rectangular section upstream.
changes to a wedge downstream.
|Now run the solver 'rhoCentralFoam'|
|Terminal : rehoCentralFoam and press enter||To do this in the command terminal, type rhoCentralFoam and press Enter.|
|Iterations in terminal window||The iterations running can be seen in the terminal window.|
| Iterations running will stop after it converges.
| open paraview
||To visualise these results let us open the ParaView window once again.|
|type: paraFoam and press enter||In the command terminal, type “paraFoam” and press Enter.|
|Click APPLY in object inspector menu||Again on the left hand side of object inspector menu click APPLY.|
| Solid geometry in drop down menu
|| On the left side top in active variable control menu, you will see a dropdown menu showing Solid Color.
Now click on it and change from solid color to capital U.
|Make the color legend ON|| Now make the color legend ON by clicking on the left hand side top of active variable control menu.
| On top of the ParaView window, you can see the VCR control.
|In the paraview window||You can see the final results of U velocity.|
|In object inspector menu|| Now scroll down the Properties in Object inspector menu on the left hand side.
|Click on rescale to size||Scroll down and click on Rescale to Size.|
|You can see the final value of Velocity magnitude.|
| Select pressure in drop dwon menu (p)
|| Similarly you can select pressure.
| Calculate the Mach number
|| You can also calculate the Mach number for the flow.
| Type mach in terminal.
|| Type Mach in the command terminal.
| Open paraview window.
|| Now again open the ParaView window by typing in the command terminal paraFoam.
| In object inspector menu, check the Ma check box.
|| Scroll down.
|In VCR control click on play button >> make the color legend ON||In the VCR control menu click on PLAY and make the color legend ON.|
|In paraview window||You can see the Mach number in the color legend and corresponding colours.|
| We notice here that when the wedge is kept in a supersonic flow,
|Slide 8: For validation|| Let me switch back to the slides.
|Slide 9: Summary|| In this tutorial we learnt:
|Slide 10 : Assignment|| Assignment:
| Slide 11:
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| Slide 12:
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| Slide 13:
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| Slide 14:
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| Slide 15:
Lab Migration Project
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| Slide 16:
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| Slide 17:
| Spoken Tutorials are part of Talk to a Teacher project.
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|About the contributor|| This script has been contributed by Arvind N.
And this is Rahul Joshi from IIT BOMBAY signing off.
Thanks for joining.