I am following up from the last inquiry. I read the source code nasm.c <https://petsc.org/release/src/snes/impls/nasm/nasm.c.html> and it looks like sub-snes iteration is being initialized with a scatter call from the previous solution. In other words, if I use Newton's method for the local solver, then in each NASM iteration the Newton's method uses the previous local solution as the initial guess. Can anyone confirm this?
On Sun, Apr 2, 2023 at 6:14 PM Takahashi, Tadanaga <[email protected]> wrote: > Hello PETSc devs, > > I am using SNES NASM with Newton LS on the sub-SNES. I was wondering how > the sub-SNES chooses the initial guess during each NASM iteration. Is it > using the previously computed solution or is it restarting from zero? >
