Thanks, we are solving supersonic flows. 2015-07-07 12:31 GMT-04:00 Jed Brown <[email protected]>:
> Song Gao <[email protected]> writes: > > > Dear PETSc users, > > > > We are solving a FEM compressible Navier-Stokes problem. The unknowns are > > arranged as [ rho1, rho1*u1, rho1*v1, rho1*w1, e1, ..... ]. We are using > > ASM+ILU(0) but I'm playing with fieldsplit preconditioner to assess its > > advantages. After some search, I found most of the fieldsplit examples > are > > for Stockes flows or incompressible Navier-Stokes. Is there any > > compressible Navier-Stokes example? > > There is not an example. For low-Mach compressible, it's common to use > a preconditioner that involves a change to primitive variables and > approximate Schur complement in the pressure space. For transonic or > supersonic flows, the equations are rather strongly coupled and > fieldsplit tends to be ineffective. For such problems, it's common to > use ASM or geometric multigrid with point-block smoothers. >
