UEqn.H

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    fvVectorMatrix UEqn
    (
        betav*fvm::ddt(rho, U)
      + fvm::div(phi, U)
      + turbulence->divDevRhoReff(U)
     ==
        betav*rho*g
    );

    volSymmTensorField invA = inv(I*UEqn.A() + drag->Dcu());

    if (momentumPredictor)
    {
        U = invA & (UEqn.H() - betav*fvc::grad(p));
        U.correctBoundaryConditions();
    }

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