[petsc-users] examples of DMPlex*FVM methods

[Jed Brown]

Matthew Knepley <knepley at gmail.com> 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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