CFX & Transient structural

Shabi1992 · November 22, 2015, 13:56

Hi,
I need your help, I have a plate that vibrates in a flow , The plate is created by transient structural and the flow is simulated by CFX, It is a two- way FSI. Reynolds number is based on diameter and is 100, I want to calculate the mean velocity of fluid over a plate that vibrates in a flow. In CFD Post the velocity around of the plate while the plate is oscillating is zero, Is there any one to help me? I want to the flow feels the plate but in this way the flow cant see the plate and also there is no vortex.

ANSYS6.png

ghorrocks · November 22, 2015, 17:24

The no slip condition says that the flow next to the plate has a velocity of zero (relative to the plate). The solver is returning the correct value.

So you need to think up a more physically realistic parameter to measure.

Shabi1992 · November 23, 2015, 14:27

Quote:

Originally Posted by ghorrocks

The no slip condition says that the flow next to the plate has a velocity of zero (relative to the plate). The solver is returning the correct value.

So you need to think up a more physically realistic parameter to measure.

Thanks for your helping, So if I want to see the fluid velocity near the plate how can I simulate this case, I think this is look like a flutter, can I use Transient Structural with CFX ?

Opaque · November 23, 2015, 16:01

Not sure, but if you check your setup for the boundary conditions on the plate, you may find out that the mesh motion is not stationary, and you are enforcing No Slip Wall with Wall Velocity Relative to the Mesh Motion

If that is the case, you will see 0 velocity of the fluid. You may want to see then the Mesh Velocity instead.

Hope the above helps

Shabi1992 · November 24, 2015, 14:55

Quote:

Originally Posted by Opaque

Not sure, but if you check your setup for the boundary conditions on the plate, you may find out that the mesh motion is not stationary, and you are enforcing No Slip Wall with Wall Velocity Relative to the Mesh Motion

If that is the case, you will see 0 velocity of the fluid. You may want to see then the Mesh Velocity instead.

Hope the above helps

Thanks for your helping, I saw the Mesh Velocity and all the domain has 0 velocity!!

November 22, 2015, 13:56	CFX & Transient structural	#1
Shabi1992 New Member Join Date: Oct 2015 Posts: 28 Rep Power: 10	Hi, I need your help, I have a plate that vibrates in a flow , The plate is created by transient structural and the flow is simulated by CFX, It is a two- way FSI. Reynolds number is based on diameter and is 100, I want to calculate the mean velocity of fluid over a plate that vibrates in a flow. In CFD Post the velocity around of the plate while the plate is oscillating is zero, Is there any one to help me? I want to the flow feels the plate but in this way the flow cant see the plate and also there is no vortex. ANSYS6.png

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November 22, 2015, 17:24		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,716 Rep Power: 143	The no slip condition says that the flow next to the plate has a velocity of zero (relative to the plate). The solver is returning the correct value. So you need to think up a more physically realistic parameter to measure.

November 23, 2015, 16:01		#4
Opaque Senior Member Join Date: Jun 2009 Posts: 1,811 Rep Power: 32	Not sure, but if you check your setup for the boundary conditions on the plate, you may find out that the mesh motion is not stationary, and you are enforcing No Slip Wall with Wall Velocity Relative to the Mesh Motion If that is the case, you will see 0 velocity of the fluid. You may want to see then the Mesh Velocity instead. Hope the above helps