Matthew Knepley <[email protected]> writes: > Okay, that makes sense. If I do not have fluxes matching the sources, I do > not > preserve montonicity for an advected field. I might need this to machine > precision > because some other equations cannot tolerate a negative number there. I will > write this one down. > > Why do I need it "for a projection in a staggered grid incompressible flow > problem". > This would mean I satisfy (I think) > > \int_T div p = 0
Matt Knepley can take the divergence of a scalar. > meaning that there is a force balance on each cell to machine precision. If > I just care > about the fluid flow, this does not seem important.
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