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

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C

fvVectorMatrix UEqn
(
fvm::ddt(U)
+ fvm::div(phi, U)
- fvm::laplacian(nu, U)
);
UEqn.relax();
// Solve the momentum equation
solve(UEqn == -fvc::grad(p));