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Linh.Hoang August 25, 2009 05:18

buoyantBoussinesqSimpleFoam
 
Hi Foamers,
I try to calculate a heated channel, only the upper wall ist heated with a uniform heat flux. I try to use the new buoyantBoussinesqSimpleFoam Solver from OpenFoam 1.6.
my boundary conditions:

inlet: -fixed Value for U,k, epsilon and T

-zeroGradient for p

outlet: -zeroGradient for U,k,epsilon and T

-for p i tried to use the new bc uniformDensityHydrostaticPressure
to obtain the change of the pressure because of buoyancy, iḿ not
sure weather this is right or should i use buoyantPressure for
outlet bc?

walls: -no slip for U

-wall functions for k and epsilon

-buoyantPressure for p, iḿ not sure which value to choose,
what value ist ist exactly? for rho i choosed rhok.

Are the boundary conditions right? What are the differences between buoyantPressure and uniformDensityHydrostaticPressure? Which one ist the better choice for outlet at my case?

thanks for any help
Linh


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