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Old   October 16, 2014, 06:36
Question Flow over a fixed cylinder
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Mahdi Mazloom
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I want to model transient cross-wise two-dimensional flow over a fixed cylinder.

Should I consider a turbulence model for the fluid for Re up to 20000?

Based on attached figure from "Blevins, Flow Induced Vibration, 1990"
vortex street transforms from laminar to fully turbulent for 150<Re<300000.
But boundary layer stay laminar in this range of Re.

If so which turbulence model should I use?

Meanwhile I'v tried no turbulence modelling and the results seem good regarding Strouhal number.
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Old   October 16, 2014, 19:18
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Glenn Horrocks
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I would try the SST model in that range first, and if that seems to be giving you too much dissipation int he boundary layer then move to the gamma-theta turbulence transition model.
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cfx, flow regime, turbulence, vortex shedding

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