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foam-extend4.1-coherent-io/applications/solvers/engine/icoDyMEngineFoam/checkTotalVolume.H

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{
// Volume and motion flux check
scalar newTotalVolume = sum(mesh.V()).value();
volScalarField motionContErr =
fvc::ddt(dimensionedScalar("1", dimless, 1.0), mesh)
- fvc::div(fvc::meshPhi(U));
scalar sumLocalContErr = runTime.deltaT().value()*
mag(motionContErr)().weightedAverage(mesh.V()).value();
scalar maxContErr =
runTime.deltaT().value()*max(motionContErr.internalField());
Info<< "Volume: new = " << newTotalVolume << " old = " << totalVolume
<< " change = " << Foam::mag(newTotalVolume - totalVolume) << nl
<< "Motion continuity errors : sum local = " << sumLocalContErr
<< ", maximum = " << maxContErr
<< endl;
totalVolume = newTotalVolume;
}