Buoyancy

January 9, 2001, 10:00

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.

January 9, 2001, 12:31

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.

January 10, 2001, 08:11

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.

January 10, 2001, 12:22

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

January 10, 2001, 14:34

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

January 11, 2001, 07:30

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

January 9, 2001, 10:00	Buoyancy	#1
Elton Guest Posts: n/a	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.

January 9, 2001, 12:31	Re: Buoyancy	#2
Evan Rosenbaum Guest Posts: n/a	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.

January 10, 2001, 08:11	Re: Buoyancy	#3
Elton Guest Posts: n/a	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.

January 10, 2001, 12:22	Re: Buoyancy	#4
Evan Rosenbaum Guest Posts: n/a	We've used FLUENT 4.32, 4.48, 5.1 and 5.4.8.

January 10, 2001, 14:34	Kappa-Epsilon??	#5
Clinton Lafferty Guest Posts: n/a	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

January 11, 2001, 07:30	Re: Kappa-Epsilon??	#6
Elton Guest Posts: n/a	Yes, I got you. Kappa-epsilon is K-e turbulence model.

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