CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   OpenFOAM Running, Solving & CFD (http://www.cfd-online.com/Forums/openfoam-solving/)
-   -   No-slip boundary condition for oscillating airfoil (http://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

I don't understand your question...

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


All times are GMT -4. The time now is 00:58.