> > 2) It would be nice to know what exactly is being dropped. <full> > > is obvious and apparently <diag> drops the right most matrix, but > > what do lower and upper drop? > > > > http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/PC/PCFIELDSPLIT.html > > > > 3) I'm confused about the minus sign in the <diag> form and its > > motivation. It doesn't come from the factorization. Is the rhs > > multiplied with a minus sign as well? Why not follow the sign > > convention of Elman's taxonomy (eq 3 and 4, JCP 227, 2008)? > > > > It makes the PC positive definite. > > Matt
Thanks Matt, these petsc-dev manual pages are much clearer than current. dr. ir. Christiaan Klaij CFD Researcher Research & Development E mailto:C.Klaij at marin.nl T +31 317 49 33 44 MARIN 2, Haagsteeg, P.O. Box 28, 6700 AA Wageningen, The Netherlands T +31 317 49 39 11, F +31 317 49 32 45, I www.marin.nl
