[EmadTandis]

Hello friends
I was looking at some PISO solver algorithms like sonicLiquidFoam and noticed that continuity error is calculated using three variables, one of which is cumulative error. What is the physical meaning of this variable? and Is is correct to calculated it in inner loop of PISO?!

[RobertHB]

 {
    volScalarField contErr(fvc::div(phi));

    scalar sumLocalContErr = runTime.deltaTValue()*
        mag(contErr)().weightedAverage(mesh.V()).value();

    scalar globalContErr = runTime.deltaTValue()*
        contErr.weightedAverage(mesh.V()).value();
    cumulativeContErr += globalContErr;

    Info<< "time step continuity errors : sum local = " << sumLocalContErr
        << ", global = " << globalContErr
        << ", cumulative = " << cumulativeContErr
        << endl;
 }

Seems like it is the summed up value of the global continuity error.