# Heat source using fvOptions in laplacianFoam

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July 17, 2014, 07:09
Heat source using fvOptions in laplacianFoam
#1
New Member

Kalli
Join Date: Jul 2014
Posts: 9
Rep Power: 4
Hello Foamers,

I am working on a solid conduction problem using laplacianFoam where I wish to add a heat generation term Q [W/m^3] on selected cells (using topoSet) in the mesh. I have modified the laplacianFoam in following way:

Quote:
 fvm::ddt(T) - fvm::laplacian(DT, T) - fvOptions(T)
But I need to apply the heat generation term which I intend to keep constant. I am not sure how I achieve that with the above formulation.

After reading on fvOptions, I realized that I could use scalarExplicitSetValue to define a scalar explicit source. But this method will only fix temperature in the selected cellZone whereas I intend to fix the heat generation rate.

I do not intend to define the heat generation region in geometry this is why fvOption is more suitable for my problem. I am looking forward to your insights.

Thank you.

July 17, 2014, 09:32
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#2
New Member

Kalli
Join Date: Jul 2014
Posts: 9
Rep Power: 4
As I was digging further I glanced upon semiImplicitSource and tried to use it. I am not sure if my formulation is right as my results are highly non-physical.

Here is what I tried. The heat generation rate Q [W/m^3] can be written as

Quote:
 Q=rho*Cp*(T-T_old)
which implies

Quote:
 T = T_old + Q/(rho*Cp)
So, I define injectionRateSuSp as

Quote:
 T (Q/(rho*Cp) 1<---[for T_old] )
Do you think the above method make sense?

Though, I am not sure as the temperature field gives out unreal numbers. The absolute temperature goes down to 0.

Any insight will be much appreciated.

Thank you.

 Tags conduction, fvoptions, heat generation rate, laplacianfoam

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