EEqn.H

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{
    volScalarField& he = thermo.he();
 
    fvScalarMatrix EEqn
    (
        fvm::div(phi, he)
        + (
            he.name() == "e"
            ? fvc::div(phi, volScalarField("Ekp", 0.5 * magSqr(U) + p / rho))
            : fvc::div(phi, volScalarField("K", 0.5 * magSqr(U)))
        )
        - fvm::laplacian(turbulence->alphaEff(), he)
        ==
        fvOptions(rho, he)
    );
 
    EEqn.relax();
 
    fvOptions.constrain(EEqn);
 
    eresidual = EEqn.solve().initialResidual();
 
    fvOptions.correct(he);
 
    thermo.correct(); // Here are calculated both temperature and density based on P,U and he.
}