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incompatible fields for operationproblem in simpleFoam

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Old   March 10, 2009, 10:51
Default Hi Khaled, I think your fvm
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kbr
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Hi Khaled,

I think your fvm::Sp(rho, alpha)-Term should just look like 'rho*alpha' due to its explicit character. 'fvm' is used for source terms like fvm::Sp(rho,U) in any UEqn.
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Old   March 10, 2009, 11:10
Default Hey Kerstin, my goal is to
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Hey Kerstin,

my goal is to solve the steady-state navier-stokes-equation in simpleFoam with a volume sourceterm rho*alpha.

You mean it is enough to write

fvm::div(phi, U)
+ rho*alpha
+ turbulence->divR(U) );

?

Khaled
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Old   March 10, 2009, 11:16
Default Hi Khaled, yes I think so b
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Hi Khaled,

yes I think so but I'm not sure. In my opinion the only way to discretize this term implicitly is

fvm::Sp(rho * alpha / U, U)

but I'm not sure if this is a good idea. Have a look in the source code of some turbulence models like kOmegaSST (epsEqn).

Kerstin
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Old   March 10, 2009, 11:25
Default Ok Kerstin, thanks for the
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Ok Kerstin,

thanks for the answer.

But last question: what means the term

fvm::Sp(rho * alpha / U, U)

exactly or how openFoam discretize this term?
I am a beginner and donīt understand openfoam really good.

Regards,
Khaled
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