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foam-extend4.1-coherent-io/applications/solvers/incompressible/icoDyMFoam/UEqn.H

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fvVectorMatrix UEqn
(
fvm::ddt(U)
+ fvm::div(phi, U)
- fvm::laplacian(nu, U)
);
if (momentumPredictor)
{
solve(UEqn == -fvc::grad(p));
}