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Old   May 25, 2003, 19:26
Default cavitation
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bob
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Does anybody know about any sucsess in modelling of cavitating flows using star-CD? I'd like to find references for the model description and results of calculations. Thank you.
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Old   May 30, 2003, 08:01
Default Re: cavitation
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frankie
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Hi Bob!

STAR has 2 cavitation models: the barotropic one (based on a paper by Schmidt, 1999 [1]) and the bubble two-phase one (based on a paper by Kubota, 1992 [2]). The barotropic modle assumes a weak compressibility of both vapor and liquid for calculating the vaopr fraction. The bubble model uses the assumption of local equilibrium of a bubble cloud to set the vapor fraction. Practically, the barotropic model is best suited for internal or nozzle flows, whereas the bubble two-phase is found to give better results where bubble cavitation plays a major role, for instance for hydrofoils. Moreover, STAR has the capability to run the cavitation with a free-surface, i.e. you have a free-surface separating a light from an heavy fluid, and cavitation can additionnaly appear in the heavy fluid (see also the supplementary notes coming along STAR v3150A)

Cheers,

Frankie.

[1] Schmidt & al., Cavitation in Two-Dimensional Asymmetric Nozzles, SAE Technical Paper 1999-01-0518, 1999. [2] Kubota & al., A new modeling of cavitating flows: a numerical study of unsteady cavitation on a hydrofoil section, J. Fluid Mech., 240, 1992.
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Old   June 18, 2003, 16:11
Default Re: cavitation
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aditya
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Hi

How do you say for sure that the Bubble model of cavitation is better suited for only external flows (flows of hydrofoils) and not well suited for internal nozzle flows?
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