Buoyancy
 

Dear All,

I am now simulating air flow patern driven by buoyancy. Could anyone tell me what turbulence model should I use and what should I do with other definitions in fluent 4.5. Thanks a lot.

Re: Buoyancy
 

Elton, we've gotten good results for buoyancy-driven air flows using the standard kappa-epsilon turbulence model. Don't use the Bousinnesq approximation with buoyancy unless you have really small temperature gradients.

Re: Buoyancy
 

Hi Evan,

Thanks for your response. Could you tell me what fluent code are you using because fluent 4.5 doesn't have standard Kappa-epsilon turbulence model.

Re: Buoyancy
 

We've used FLUENT 4.32, 4.48, 5.1 and 5.4.8.

Kappa-Epsilon??
 

kappa-epsilon? Are you refering to the k-epsilon turbulence model based on kinetic energy and turbulent dissipation? If not, please provide a reference.

Thanks, Clinton

Re: Kappa-Epsilon??
 

Yes, I got you. Kappa-epsilon is K-e turbulence model.