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??

I forgot, that I dont intend to report any specific values I just want the vorticity contours...

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"

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

Michael what you thimnk about RNG for rotating for (vorticity)

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.

Hi, Use k-epsilon model.

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.

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

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