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Old   June 14, 2012, 16:03
Default stirred vessel
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francesco
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hi all,
i'm new with cfx and i'm trying to simulate a multiphase liquid-liquid stirred tank.
i began with a simple single phase model, but the solver fails because it finds a non zero normal component of the velocity of the rotating mixer shaft. this is due, I think, to the low quality triangular mesh of the shaft itself, which doesn't reproduce the curvature of the cylindrical element. Is there any mesh method to overcome this problem? i tried to convert the 3 node surface tri element with a 6 node surface element, but it seems that ICEM can't generate the volume mesh elements.
I've attached the icem cfd file.
Anyone can help me?

Best Regards,

Francesco
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Old   June 14, 2012, 19:15
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Glenn Horrocks
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Quote:
Is there any mesh method to overcome this problem?
Isn't that obvious? You need to improve mesh quality. Specifically you need a finer mesh which resolves the shape better.

CFX (or just about any other CFD solver) cannot use "high order elements" like FEA does, so forget about the 6 node surface elements. Finite volume CFD solvers put the high order numerics in the discretisation scheme, not the element formulation.
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