UEqn.H

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    // Solve the Momentum equation
 
    MRF.correctBoundaryVelocity(U);
 
    UEqn =
    (
        fvm::div(phi, U)
      + MRF.DDt(rho, U)
      + turb.divDevRhoReff(U)
     ==
        fvOptions(rho, U)
    );
 
    UEqn.relax();
 
    fvOptions.constrain(UEqn);
 
    if (momentumPredictor)
    {
        solve
        (
            UEqn
        ==
            fvc::reconstruct
            (
                (
                - ghf*fvc::snGrad(rho)
                - fvc::snGrad(p_rgh)
                )*mesh.magSf()
            )
        );
 
        fvOptions.correct(U);
    }