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PotentialFOAM - meeting the Kutta condition

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Old   January 9, 2012, 05:32
Default PotentialFOAM - meeting the Kutta condition
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Richard Moser
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I am using the potentialFOAM solver for flow around a 2D aerofoil (in this case a multi-element aerofoil, but my question is general). I understand the limitations of using a potential solver, but there are good reasons for doing it in this case. The problem I am having is in making sure that the Kutta condition is satisfied. I have attached a screenshot of the streamlines I am currently getting, which indicate that the Kutta condition is not being satisfied (and also explains why my results match neither the exact solution or the output from another potential method). My question is therefore what I need to do to make sure that the Kutta condition is satisfied - is it something in my boundary files (which I have attached), or a separate setting somewhere?

Any help would be much appreciated.

Richard
Attached Images
File Type: jpg streamlines.jpg (67.0 KB, 40 views)
Attached Files
File Type: txt initialConditions.txt (975 Bytes, 13 views)
File Type: txt U.txt (1.3 KB, 14 views)
File Type: txt p.txt (1.3 KB, 7 views)
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Old   January 11, 2012, 15:29
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Pablo
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To get kutta condition you need a rotational fluid, so at least inviscid.
With potential flow you need to define the wakes explicitly.
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Old   January 11, 2012, 16:43
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Richard Moser
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Thanks for your response. Do you know how to define the wake explicitly in potentialFoam?
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Old   January 11, 2012, 17:42
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well, a very rude solution would be create a gap at the mesh from the trailing edge until the end, you must choose the angle (it could be aligned with free stream or tangent to trailing edge and after aligned with T.E.)
And the best solution is work with euler equations, it means delete every difusive term, u will work with inviscid rotational fluid.
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