Any other model instead of boussinesq model?

September 25, 2003, 18:27

In manual, Boussinesq approximation is valid when beta*(T-T_0) << 1 and should not be used if the temperature differences are large.

@ beta : thermal expansion coefficient.

So, What model can I use for buoyancy-effected flow (ex, mixed convection with property variations) except Boussinesq approximation in FLUENT?

September 26, 2003, 05:45

Hi,

If the pressure variations are small enough, you could use incompressible ideal gas model. It should be used when the flow is fully incompressible, then density is a function of temperature only, where for ideal gas model it is a function of pressure and temperature. Therefore you should specify the operating pressure for this model.

Regards emre

September 25, 2003, 18:27	Any other model instead of boussinesq model?	#1
moon Guest Posts: n/a	In manual, Boussinesq approximation is valid when beta*(T-T_0) << 1 and should not be used if the temperature differences are large. @ beta : thermal expansion coefficient. So, What model can I use for buoyancy-effected flow (ex, mixed convection with property variations) except Boussinesq approximation in FLUENT?

September 26, 2003, 05:45	Re: Any other model instead of boussinesq model?	#2
emre Guest Posts: n/a	Hi, If the pressure variations are small enough, you could use incompressible ideal gas model. It should be used when the flow is fully incompressible, then density is a function of temperature only, where for ideal gas model it is a function of pressure and temperature. Therefore you should specify the operating pressure for this model. Regards emre

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