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The resistance force of flow around vertical cylinder is high

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Old   August 25, 2013, 09:54
Default The resistance force of flow around vertical cylinder is high
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mr
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Dear all,

Hi,I am simulating the flow motion around a vertical cylinder under uniform

current.The velocity of flow is 0.15m/s.The flow depth is 0.5m.The cylinder

parameters are:diameter=0.25m,height=0.85m.The RNG turbulence model is used.In my

simulation vortices can be seen.However,the resistance force calculated by Flow3D

(=1.46) is much higher than the experimental result(=1.07).I don't know why this

happens.Please help me!

Thanks!
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Old   August 27, 2013, 23:46
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Dear all,

I have consulted many literatures these days.Maybe the problem of my simulation is that the boundary layer resolution around component is inaccurate.But I don't know how to improve it and how to set friction and surface roughness.

Could anyone help me?Thanks!
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