Flow over a fixed cylinder

mahdimazloom · October 16, 2014, 06:36

TUBES_CROSSFLOW_OVER_FIG2.jpg

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.

ghorrocks · October 16, 2014, 19:18

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.

October 16, 2014, 06:36	Flow over a fixed cylinder	#1
mahdimazloom New Member Mahdi Mazloom Join Date: Jul 2014 Location: Mashhad - Iran Posts: 12 Rep Power: 12	TUBES_CROSSFLOW_OVER_FIG2.jpg 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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October 16, 2014, 19:18		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	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.