UEqn.H

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    fvVectorMatrix UEqn
    (
        fvm::ddt(rho, U)
      + fvm::div(rhoPhi, U)
      + turbulence->divDevRhoReff(rho, U)
    );
 
    UEqn.relax();
 
    if (pimple.momentumPredictor())
    {
        solve(UEqn == -fvc::grad(p));
    }
 
    Info<< "max(U) " << max(mag(U)).value() << endl;