No-slip boundary condition for oscillating airfoil

Tarak · May 7, 2013, 19:29

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 · Yesterday, 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.

May 7, 2013, 19:29	No-slip boundary condition for oscillating airfoil	#1
Tarak Member Tarak Join Date: Aug 2010 Location: Atlanta, GA Posts: 99 Rep Power: 4	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

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Time dependant pressure boundary condition	yosuke1984	OpenFOAM Verification & Validation	2	April 7, 2013 10:36
CFX fails to calculate a diffuser pipe flow	shenying0710	CFX	7	March 26, 2013 05:13
Wind turbine simulation	Saturn	CFX	23	April 16, 2011 07:34
Slip Boundary Condition over the curve wall	Kelvin_mk	OpenFOAM	0	March 16, 2011 01:15
Low-Pressure Boundary Slip	AlexA	FLUENT	1	January 5, 2007 21:30

May 8, 2013, 02:47		#2
fredo490 Senior Member HECKMANN Frédéric Join Date: Jul 2010 Posts: 121 Rep Power: 4	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

Yesterday, 06:09		#3
simt New Member Join Date: Apr 2013 Posts: 5 Rep Power: 2	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.