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Forum: OpenFOAM

July 28, 2010, 16:33

Replies: 22

HeatFlux in buoyantBoussinesq

Views: 18,191

Posted By Thomas Baumann

Hi, I have never used OpenFOAM-1.6.x. But...

Hi,
I have never used OpenFOAM-1.6.x.

But it works using OpenFOAM-1.6 and the same data works with OpenFOAM-1.7.

Regards Thomas

Forum: OpenFOAM

July 13, 2010, 03:18

Replies: 22

HeatFlux in buoyantBoussinesq

Views: 18,191

Posted By Thomas Baumann

Hi Robert, you have normally two kinds of...

Hi Robert,

you have normally two kinds of boundary conditions:
set a fixed value, for example the temperature or set a gradient for example wallheatflux. You mkust know more details of yoyur...

Forum: OpenFOAM

February 9, 2010, 04:28

Replies: 22

HeatFlux in buoyantBoussinesq

Views: 18,191

Posted By Thomas Baumann

Hi panda60, you need to understand how the...

Hi panda60,

you need to understand how the temperature-field is determined with the basic turbulence models (like kepsilon). Normally you set a turbulent Prandtlnumber as a constant (e.d. 0.9) and...

Forum: OpenFOAM

February 9, 2010, 03:19

Replies: 22

HeatFlux in buoyantBoussinesq

Views: 18,191

Posted By Thomas Baumann

Hi David, if you solve a turbulent flow you...

Hi David,

if you solve a turbulent flow you have to use k=alpha_eff=alpha_laminar+alpha_turbulent p.e. for RANS. So because you don't know alpha_turbulent pre the simulation if you're using a...

Forum: OpenFOAM

December 2, 2009, 05:41

Replies: 22

HeatFlux in buoyantBoussinesq

Views: 18,191

Posted By Thomas Baumann

Hi Stawrogin, I'm using OpenFOAM-1.6. For...

Hi Stawrogin,

I'm using OpenFOAM-1.6. For the wallheatflux I implemented a boundary condition downloaded from the wikipage of OpenFOAM.

http://openfoamwiki.net/index.php/Contrib_wallHeatFlux
...

Forum: OpenFOAM

December 1, 2009, 08:32

Replies: 22

HeatFlux in buoyantBoussinesq

Views: 18,191

Posted By Thomas Baumann

Hello stawrogin, I think alphaEff and...

Hello stawrogin,

I think alphaEff and kappaEff is the same, look:

For the wallheatflux:

gradient = heatflux / (alphaEff * cp0 *rho0)

with
heatflux = J/(s*m^2)

Forum: OpenFOAM

November 30, 2009, 12:00

Replies: 22

HeatFlux in buoyantBoussinesq

Views: 18,191

Posted By Thomas Baumann

Hello, kappaEff at the...

Hello,

kappaEff at the buoyantBoussinesqSimpleFoam solver and alphaEff in the turbulentHeatFluxTemperature patch are the same variable. So rename one of them, recompile it and that's it.

The...

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