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horizontal axis wind turbine- Issue in interface b/w stationary and rotating domain.

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Old   February 4, 2016, 07:45
Default horizontal axis wind turbine- Issue in interface b/w stationary and rotating domain.
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Sreejith B K
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Hello everyone,.

I am new in CFX. I simulated horizontal axis wind turbine through MRF approach. Rotating domain with turbine blade kept inside stationary domain.
Boundary conditions;
stationary : Velocity inlet, pressure outlet slip walls for top and bottom and periodic for side wall (120 deg sect).
Rotating : blade - no slip wall, side walls rotational periodic. interfaces with stationary domain - frozen rotor>pitch-none .

My simulation got converged. The problem is rotating domain is not interacting with outer domain. I don't know where i made mistake. Please help me....!!!
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Old   February 4, 2016, 10:21
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Frozen rotor > Pitch change = Automatic
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Old   February 5, 2016, 06:09
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Thank you turbo for your reply,

I tried automatic and pitch value (0.1, 0.7). But no significant changes observed. here i attached velocity contour at side 1 and side 2 of interface at outlet. I compared my CFX setup with a CFX Pre setup downloaded from the same forum. The only difference i felt is, the number of mesh element on both sides of interface are not exactly equal in my case. Does it matter?
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Old   February 5, 2016, 09:32
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The automatic is what it does for dissimilar meshes at the interface. Your problem looks to be somewhere else. Try a temporary model that has no upper stationary domain but the upstream and downstream only, i.e., an axial model of S1-R1-S2 with the frozen rotor automatic interface. Apply a stationary wall to the upper side. See how it goes. And then go back to your model. You will debug the issue. I suspect a mesh-related problem.

Last edited by turbo; February 6, 2016 at 10:20.
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Old   February 8, 2016, 00:26
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Thank you turbo for your kind reply.
I will try it...

I did meshes for inner and outer domains as separate mesh files. Then imported both mesh files one by one into CFX and gave all boundary conditions. I have not given any interface coupling ( as in fluent) other than frozen rotor options. Did I made any mistake here? Can you please suggest what are the things that i can do for mesh modifications ?
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Old   February 22, 2016, 05:20
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Thank you turbo.

I tried with a rectangular block instead of blade with similar boundary conditions. There everything works fine. So i guess something is wrong in blade mashing, not boundary conditions...!! Am I right?
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