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Old   February 28, 2006, 07:35
Default simulate flow over a cylinder
  #1
changkiang
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hello, anyone is simulating (or has been simulated) flow past a cylinder? my averaged Cd(Re=1000~10000) is around 1.5 then much larger than that in experiment. by the way, my material is water, turbulent model LES, 35000 strctured grid in 20*40 mm computational domain.

any suggestion is appreciated in advance!
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Old   February 28, 2006, 13:48
Default Re: simulate flow over a cylinder
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se
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In the Reynolds number quoted, the flow is turbulent with significant spanwise flow structures. You should use 3-D model.
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Old   February 28, 2006, 16:15
Default Re: simulate flow over a cylinder
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MOHAMMED
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well, you have a low Reynolds number so unsteady vortex shedding is expected. so you have to enable usteady solver and to have a fine mesh. using dynamic mesh adaptation will be useful. but i dont think that using 3d model will be a good idea, especially if you dont want to simulate the instability in the flow.
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Old   February 28, 2006, 16:36
Default Re: simulate flow over a cylinder
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Ahmed
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1- www.studentfluent.com 2- click on tutorial lib 3- tutorial 6 Flow past a circular Cylinder
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Old   February 28, 2006, 16:48
Default Re: simulate flow over a cylinder
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onlooker
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Thanks Ahmed!
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Old   March 1, 2006, 00:02
Default Re: simulate flow over a cylinder
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changkiang
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thank u man! the website is awfully helpful i believe.
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Old   March 1, 2006, 00:17
Default Re: simulate flow over a cylinder
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changkiang
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i agree with u,MOHAMMED. BUT, these is a problem, how to use dynamic mesh adaptaton? i'v ever done vortex induce vibration(VIV)and once used dynamic mesh, and i don't think they are the same.

THANX VERY MUCH!
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Old   March 3, 2006, 18:13
Default Re: simulate flow over a cylinder
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Ahmed
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That is nice. So be good and spread the word around, do not keep it for your selves. You can also use google to look for more sites with free tutorials
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Old   March 3, 2006, 21:25
Default Re: simulate flow over a cylinder
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changkiang
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i can not agree you more.

thanks again!
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