Re: [petsc-users] Reasons for breakdown in preconditioned LSQR

Thanks for the quick response! On 07. 05. 24 14: 24, Pierre Jolivet wrote: > > >> On 7 May 2024, at 7: 04 AM, Marco Seiz wrote: >> >> This Message Is From an External Sender >> This message ZjQcmQRYFpfptBannerStart This Mess

[petsc-users] Reasons for breakdown in preconditioned LSQR

Hello, something a bit different from my last question, since that didn't progress so well: I have a related model which generally produces a rectangular matrix A, so I am using LSQR to solve the system. The matrix A has two nonzeros (1, -1) ZjQcmQRYFpfptBannerStart

Re: [petsc-users] Fieldsplit, multigrid and DM interaction

04:00, Barry Smith wrote: > > >    Sorry no one responded to this email sooner. > >> On Mar 12, 2024, at 4:18 AM, Marco Seiz wrote: >> >> This Message Is From an External Sender >> This message came from outside your organization. >> Hello, >&

[petsc-users] Fieldsplit, multigrid and DM interaction

Hello, I'd like to solve a Stokes-like equation with PETSc, i. e. div( mu * symgrad(u) ) = -grad(p) - grad(mu*q) div(u) = q with the spatially variable coefficients (mu, q) coming from another application, which will advect and evolve fields ZjQcmQRYFpfptBannerStart