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How to extract viscous dissipation

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Old   April 2, 2019, 07:44
Default How to extract viscous dissipation
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I am new to OpenFoam and have tried to extract the viscous term from my own PisoFoam, with :

Code:
V= turbulence->divDevReff(U);
and get the following error when compiling

Code:
UEqn.H:17:28: error: no match for 'operator=' (operand types are 'Foam::volVectorField {aka Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh>}' and Foam::tmp<Foam::fvMatrix<Foam::Vector<double> > >')
 V= turbulence->divDevReff(U);
can I instead use a sentence like this perhaps, will that give me the same value as the one I tried?:

Code:
V=turbulence->nuEff()*fvc::laplacian(U);
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