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-   -   No-slip boundary condition for oscillating airfoil (https://www.cfd-online.com/Forums/openfoam-solving/117398-no-slip-boundary-condition-oscillating-airfoil.html)

 Tarak May 7, 2013 19:29

No-slip boundary condition for oscillating airfoil

Hii,

I'm using the pimpleDyMFoam solver for simulations of flow over a sinusoidally oscillating airfoil. I have an AMI surface which oscillates along with the airfoil. For this problem, can someone tell me how to use the no-slip BC for U at the airfoil surface? I'm thinking about 2 BC's right now:
1) movingwallvelocity
2) oscillatingFixedValue

Please let me know which one is better suited for this purpose.

Thanks,
Tarak

 fredo490 May 8, 2013 02:47

A no slip boundary condition is done by setting a relative velocity (wall vs air) equal to zero at the wall. If I understand, your problem is that the wall is actually moving so the wall velocity is not anymore (0 0 0) ?

From my understanding of the Dynamic Mesh in OpenFoam, there is a loop of correction to take into account the displacement of the mesh. So a fixedValue (0 0 0) should still be right ?!

That's actually a good question ;)

 simt May 12, 2013 06:09

movingWallVelocity specifies velocity relative to the (moving) mesh.
fixedValue is velocity relative to space.

You should use movingWallVelocity for the no-slip on the foil.

 zebbi June 5, 2013 07:04

stick-slip boundary

Quote:
 Originally Posted by Tarak (Post 425970) Hii, I'm using the pimpleDyMFoam solver for simulations of flow over a sinusoidally oscillating airfoil. I have an AMI surface which oscillates along with the airfoil. For this problem, can someone tell me how to use the no-slip BC for U at the airfoil surface? I'm thinking about 2 BC's right now: 1) movingwallvelocity 2) oscillatingFixedValue Please let me know which one is better suited for this purpose. Thanks, Tarak
hello
i am a new member, i am doing some research in fluid dynamic and want some help from any one related to my research how to approach stick-slip conditions
thanks
nauman

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