> On Oct 30, 2015, at 12:23 PM, Zou (Non-US), Ling <[email protected]> wrote: > > Hi All, > > From physics point of view, I know my simulation converges if nothing changes > any more. > > I wonder how normally you do to detect if your simulation reaches steady > state from numerical point of view. > Is it a good practice to use SNES convergence as a criterion, i.e., > SNES converges and it takes 0 iteration(s)
Depends on the time integrator and SNES tolerance you are using. If you use a -snes_rtol 1.e-5 it will always try to squeeze 5 MORE digits out of the residual so won't take 0 iterations even if there is only a small change in the solution. > > Thanks, > > Ling
