Problem with interface in a wind turbine simulation

be_inspired · June 9, 2009, 12:57

Hi,

I am performing a simulation of a wind turbine and there is a interface in the middle of the blade that I have used to divide the geometry between inner and outer. ( the interface is not a plane, but a circular sector of 120 grades).
In the simulation I use Moving reference Frame so I have a 120 grades sector and periodic conditions ( rotational) in the planes of -60 a 60 grades.

The problem is that when a perform the simulation, all seems ok ( even the values of moments and forces go in the good way), but if I see the pressure conditions in the inlet, outlet and periodic faces, there is a jump in pressure and other variables. ( and some gaps between the two zones because the bunching is not the same).

Fluent creates 2 new walls, but I do not change the boundary conditions of the 2 walls. Is it neccesary to change them? If I try to show them, they are empty.

Thanks a lot.

be_inspired · June 9, 2009, 13:07

Maybe with an image is better to understand the situation.
Thanks

naimishharpal · March 8, 2011, 00:46

Did you find the solution to this issue? I'm having the same problem when using STAR-CCM+. The interface cannot perform 100% every time. It has about 0.04% mismatch and converts those cells as wall, and that's why it is obvious that you see pressure jumps.

The solution could be 'fine' mesh over the interface surface. That will reduce the 'chances' of over slipping. Do you have any other solution???

Regards,
Naimish

June 9, 2009, 12:57	Problem with interface in a wind turbine simulation	#1
be_inspired Senior Member M. Montero Join Date: Mar 2009 Location: Madrid Posts: 155 Rep Power: 17	Hi, I am performing a simulation of a wind turbine and there is a interface in the middle of the blade that I have used to divide the geometry between inner and outer. ( the interface is not a plane, but a circular sector of 120 grades). In the simulation I use Moving reference Frame so I have a 120 grades sector and periodic conditions ( rotational) in the planes of -60 a 60 grades. The problem is that when a perform the simulation, all seems ok ( even the values of moments and forces go in the good way), but if I see the pressure conditions in the inlet, outlet and periodic faces, there is a jump in pressure and other variables. ( and some gaps between the two zones because the bunching is not the same). Fluent creates 2 new walls, but I do not change the boundary conditions of the 2 walls. Is it neccesary to change them? If I try to show them, they are empty. Thanks a lot.

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March 8, 2011, 00:46		#3
naimishharpal Member Naimish Harpal (MS Aerospace Engr) Join Date: Jul 2009 Location: Long Beach, CA Posts: 50 Rep Power: 17	Did you find the solution to this issue? I'm having the same problem when using STAR-CCM+. The interface cannot perform 100% every time. It has about 0.04% mismatch and converts those cells as wall, and that's why it is obvious that you see pressure jumps. The solution could be 'fine' mesh over the interface surface. That will reduce the 'chances' of over slipping. Do you have any other solution??? Regards, Naimish