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Over predicted frequency in cyclone separator

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Old   March 21, 2006, 00:02
Default Over predicted frequency in cyclone separator
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Hi, Everyone: I am doing the simulation of a reversed flow cyclone separator using FLUENT6.1, URANS+RSM+SIMPLE+QUICK, timestep is 0.0001, predicted frequency of precessing vortex core is 164Hz, while the experimental result is 45Hz. why so large the difference between the simulation and the experiment?

Any suggestion will be appreciated. Thank you!
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