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October 30, 2006, 13:50 |
flow over cylinder
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#1 |
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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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October 30, 2006, 15:06 |
Re: flow over cylinder
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#2 |
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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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October 31, 2006, 00:56 |
Re: flow over cylinder
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#3 |
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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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October 31, 2006, 04:25 |
Re: flow over cylinder
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#4 |
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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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October 31, 2006, 04:34 |
Re: flow over cylinder
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#5 |
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Michael what you thimnk about RNG for rotating for (vorticity)
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October 31, 2006, 05:32 |
Re: flow over cylinder
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#6 |
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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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November 1, 2006, 04:26 |
Re: flow over cylinder
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#7 |
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Hi, Use k-epsilon model.
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November 1, 2006, 13:45 |
Re: flow over cylinder
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#8 |
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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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November 2, 2006, 14:05 |
Re: flow over cylinder
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#9 |
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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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November 6, 2006, 22:37 |
Re: flow over cylinder
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#10 |
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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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