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TEqn implementation in icoReactingMultiphaseInterFoam

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Old   September 30, 2019, 10:28
Question TEqn implementation in icoReactingMultiphaseInterFoam
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Gowthaman Parivendhan
Join Date: Aug 2019
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Hi Foamers,

I have a basic question on implementation of temperature equation in one of the solvers in OF v1806. I was going through the TEqn.H file of icoReactingMultiphaseInterFoam in OF and found the following implementation:

 fvScalarMatrix TEqn
        fvm::ddt(rhoCp, T)
      + fvm::div(rhoCpPhi, T, "div(phi,T)")
      - fvm::Sp(fvc::ddt(rhoCp) + fvc::div(rhoCpPhi), T)
      - fvm::laplacian(kappaEff, T,  "laplacian(kappa,T)")
      + radiation->ST(T)
      + fvOptions(rhoCp, T)
Does the left-hand side of the equation mean the following?
\rho C_{p} \frac{\partial T}{\partial t} + \rho C_{p} \nabla . (\Phi T) - \Delta (kT)

If that is the case, then why are density and Cp has taken out as constant? Shouldn't the volume of fluid averaged rhoCp depend on both time and space in a multiphase system?

Please let me know if I'm missing something here as I'm quite new to heat transfer modelling.

Many thanks,
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heat and mass transfer, openfoam 1806, teqn, vof method

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