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Modelling a propeller

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Old   May 15, 2003, 14:17
Default Modelling a propeller
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amorriison
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How do CFD programs model a propeller?

Various methods - pressure increasing disk - to CFDing the propeller blade itself?
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Old   May 16, 2003, 04:17
Default Re: Modelling a propeller
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Holidays
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It depends what you want to do. In most cases one will model the propeller per se and set a multi-frame of reference case. With CFX I have seen modelled the full hull, the propeller and the free surface; this is important as for boats the interaction between propeller and hull can be fundamental (or propeller and pod).

In some cases, say a big water treatment tank or a mixing vessel maybe, you may represent the stirring effect of blades via a source term, although this might not always work well, eg if the baldes are close to walls or if the blades occupy a significant volume in the vessel etc.
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