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-   -   The resistance force of flow around vertical cylinder is high (http://www.cfd-online.com/Forums/flow-3d/122673-resistance-force-flow-around-vertical-cylinder-high.html)

hpkidmr August 25, 2013 09:54

The resistance force of flow around vertical cylinder is high
 
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!

hpkidmr August 27, 2013 23:46

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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