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Old   October 30, 2006, 14:50
Default flow over cylinder
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Rekha
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I want to model flow over two cylinders in Fluent 6.2, I just have a reynolds number, which turbulence model should I use preferably and why??
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Old   October 30, 2006, 16:06
Default Re: flow over cylinder
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rekha
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I forgot, that I dont intend to report any specific values I just want the vorticity contours...
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Old   October 31, 2006, 01:56
Default Re: flow over cylinder
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sach
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for vorticity fluent recomends rng model is you are using thin fluid (air water) then go for k-e second order, but for rng check whats the mesh requirement I am not sure but you need to go for hex mesh. beware of the y+. Rekha let me know if it works, shall I kidd for a min "Umrao Jaan"
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Old   October 31, 2006, 05:25
Default Re: flow over cylinder
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Michael B
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dont use k-espilon as it tends to stick more to the surface than in real life. Use a k-omega based SST instead. Check out www.pbase.com/michaelbo/cfd
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Old   October 31, 2006, 05:34
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sach
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Michael what you thimnk about RNG for rotating for (vorticity)
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Old   October 31, 2006, 06:32
Default Re: flow over cylinder
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Michael B
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probably better than standard k-epsilon but I have the experience that it is very case dependent. If you wan't to calc swirling flows i recommend RSM.
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Old   November 1, 2006, 05:26
Default Re: flow over cylinder
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Salar askari
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Hi, Use k-epsilon model.
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Old   November 1, 2006, 14:45
Default Re: flow over cylinder
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rekha
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Hi,

I want to make it an external flow, I dont want any walls except the cylinder walls, how should be my mesh and BC's, what should be taken care of while mesh generation.. Please Help! rekha.
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Old   November 2, 2006, 15:05
Default Re: flow over cylinder
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RAMESH K
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Vortex shedding is an unsteady phenomenon. The user may apply either a steady state or unsteady (time dependent) solver to capture these effects, as appropriate. follow this link www.mne.psu.edu/cimbala/Learning/Fluent/fluent_cylinder.htm - 21k
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Old   November 6, 2006, 23:37
Default Re: flow over cylinder
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vinod mate
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dear rekha , i m working on flow over the cylinder in heat exchnger. can u suggest some thing when flow velocity is inclined. pl mail me thanks vinod
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