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Old   October 14, 2008, 01:46
Default Blade tip
  #1
Alex
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Hello,

I'm trying to simulate the flow arount a rotor blade tip. I'm using the SIMPLE solver and the Spalart-Almaras viscosity model. Boundary conditions are pressure-far-field.

I can't get the continuity to converge. It get's stuck at around 1-2e-4.

What can I do?

Thanks,

Alex
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Old   October 14, 2008, 02:30
Default Re: Blade tip
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doki
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that is probably related to two things. first, the outer boundaries are not far enough from the inner boundaries. this makes a pressure far field BC hard to maintain. second, the mesh is somehow coarse. especially the aspect ratio,... may not be in allowable range.
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Old   October 14, 2008, 02:42
Default Re: Blade tip
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Alex
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doki, thanks for the quick reply.

the models size is in x-direction: 15 times the chord length y-direction: 2 times the span length z-direction: 10 times the chord length

From previous simulations I thought that this should be sufficient. I'll try it with the aspect ratio first...

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Old   October 14, 2008, 06:39
Default Re: Blade tip
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Prasad Dudhgaonkar
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What's your convergence criterion for continuity?
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Old   October 14, 2008, 07:45
Default Re: Blade tip
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Alex
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I set it to 1e-5
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