what do global and cumulative terms in continuity refer to exactly?
at results there are 3 types of residuals of continuity equation.whats the definition of them and difference?if cumulative and or global be negative whats wrong in the problem?

For the solvers of incompressible fluid, take a look at the
src/finiteVolume/cfdTools/incompressible/continuityErrs.H: Code:
volScalarField contErr(fvc::div(phi)); continuity error is whether the magnitude of divergence is taken or not. The "local" error is a measure of the continuity of each cell and the "global" error represents the continuity in the whole computational domain. If the global error converges to zero, I think the negative value is of no matter. I have no idea about the importance of considering the cumulative error. Fumiya 
thanks fumiya
I cant grasp how the total continuity is calculated.my case is compressible. What does mean cumulative continuity error? Any hint is accepted here! 
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