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Term for total Stresses

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Old   April 8, 2011, 14:16
Default Term for total Stresses
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in the k-epsilon turbulence model the total stress term is calculated as volSymmTensorField
tmp<volSymmTensorField> kEps::devRhoReff() const
    return tmp<volSymmTensorField>
        new volSymmTensorField
and the source term for the momentum equation as fvVectorMatrix
tmp<fvVectorMatrix> kEps::divDevRhoReff(volVectorField& U) const
      - fvm::laplacian(muEff(), U)
      - fvc::div(muEff()*dev2(fvc::grad(U)().T()))
Now I'd like to modify the total stress tensor devRhoReff and use it for the calculation of the source term of the momentum equation divDevRhoReff like this:
fvVectorMatrix divDevRhoReff = fvc::div(devRhoReff);
However the following error occurs:
error: conversion from ‘Foam::tmp<Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> >’ to non-scalar type ‘Foam::fvVectorMatrix’ requested
Is there another way to convert the total stress tensor devRhoReff to the source term divDevRhoReff?

Thanks alot!

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