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foam-extend4.1-coherent-io/applications/solvers/compressible/sonicDyMFoam/UEqn.H

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fvVectorMatrix UEqn
(
fvm::ddt(rho, U)
+ fvm::div(phi, U)
+ turbulence->divDevRhoReff(U)
);
if (oCorr == nOuterCorr - 1)
{
if (mesh.solutionDict().relax("UFinal"))
{
UEqn.relax(mesh.solutionDict().relaxationFactor("UFinal"));
}
else
{
UEqn.relax(1);
}
}
else
{
UEqn.relax();
}
solve(UEqn == -fvc::grad(p));