[petsc-users] Nested field split

[Alexander Lindsay]

I've seen threads in the archives about nested field split but I'm not sure
they match what I'm asking about.

I'm doing a Schur field split for a porous version of incompressible
Navier-Stokes. In addition to pressure and velocity fields, we have fluid
and solid temperature fields. I plan to put all primal variables in one
split and the pressure obviously in the Schur split. Now within the "primal
variable split" a user is wondering whether we can do a further split, e.g.
perhaps an additive split with the solid temperature split out from the
velocities and fluid temperature (the former is almost pure conduction
whereas the latter may be advection dominated). Is this possible?

Alex
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