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Diffuser inlet boundary condition problem

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Old   April 4, 2009, 04:24
Question Diffuser inlet boundary condition problem
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Hi all,
I've got a radial compressor wheel, and after that a diffuser. I want to simulate only the diffuser. I've calculated the inlet velocity components numerically. It has a radial component and an axial component, but the axial is normal to every point on the inlet. If I choose "cartesian velocity component", i set the components in the global coordinate system. In "Cylindrycal vel. comp" the problem is the same. If I choose the "Normal speed" option, i can set the "axial" component, but the radial(which coming from the rotation of the compressor wheel) not. So I have to set an "axial" component, which is normal to inlet in every points, and a radial component, which is perpendicular to these axial components.

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boundary conditions, compressor, diffuser, inlet, velocity components

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