Pressure on the free slip wall

March 21, 2007, 13:36

Hi,everyone

I'm trying to simulate the flowfield of a wind turbine. The domain is shown below. The rotating frame of reference was used in the simulation.

The boundary condition of the cylindrical surface is free slip wall.

The result of streamline is reasonable. But the pressure on the free slip wall is reasonless.

The result of the pressure on the boundary is shown in the picture. How to solve this problem?

Best regards, yliu

March 21, 2007, 18:06

No pics ...

March 21, 2007, 22:51

It seems that my html code is not correct.

The picture URL is

http://lh6.google.com/image/THUWind/.../sDRzH1-Ivrg/G%3A%5CPressure.JPG

Thank you

March 22, 2007, 12:16

Hi Yliu,

What are your other boundary conditions? The variation is only +/- 200 Pa, which is fairly small. It may simply be due to roundoff.

-Robin

March 27, 2007, 14:47

Try tri linear pressure interpolation. It can be activated on the advanced tab of the solver control branch.

March 30, 2007, 04:47

Hi,Robin and Hekler Thank you! I have tried tri linear pressure interpolation. But there is no improvement. I think the mesh maybe too sparse.

March 21, 2007, 13:36	Pressure on the free slip wall	#1
yliu Guest Posts: n/a	Hi,everyone I'm trying to simulate the flowfield of a wind turbine. The domain is shown below. The rotating frame of reference was used in the simulation. The boundary condition of the cylindrical surface is free slip wall. The result of streamline is reasonable. But the pressure on the free slip wall is reasonless. The result of the pressure on the boundary is shown in the picture. How to solve this problem? Best regards, yliu

March 21, 2007, 18:06	Re: Pressure on the free slip wall	#2
Joe Guest Posts: n/a	No pics ...

March 21, 2007, 22:51	Re: Pressure on the free slip wall	#3
yliu Guest Posts: n/a	It seems that my html code is not correct. The picture URL is http://lh6.google.com/image/THUWind/.../sDRzH1-Ivrg/G%3A%5CPressure.JPG Thank you

March 22, 2007, 12:16	Re: Pressure on the free slip wall	#4
Robin Guest Posts: n/a	Hi Yliu, What are your other boundary conditions? The variation is only +/- 200 Pa, which is fairly small. It may simply be due to roundoff. -Robin

March 27, 2007, 14:47	Re: Pressure on the free slip wall	#5
HekLer Guest Posts: n/a	Try tri linear pressure interpolation. It can be activated on the advanced tab of the solver control branch.

March 30, 2007, 04:47	Re: Pressure on the free slip wall	#6
yliu Guest Posts: n/a	Hi,Robin and Hekler Thank you! I have tried tri linear pressure interpolation. But there is no improvement. I think the mesh maybe too sparse.

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