[petsc-users] Spatial distribution of the residual after an implicit TS timestep

[Barry Smith]

   You can write a custom monitor and set it with TSMonitorSet() 

    This routine would call TSGetSNES() then SNESGetSolution() then call SNESComputeFunction() then call VecView() on the result.

    But note that just because the residual is big somewhere doesn’t mean the error need be.

    You could also run with -snes_monitor_residual to see how the residual is being reduced inside the nonlinear solve (that is, what parts of the residual are most stubborn).


    Barry


On Mar 15, 2014, at 5:47 PM, Mani Chandra <mc0710 at gmail.com> wrote:

> Hi,
> 
> Is there anyway I can VecView the residual after TS has completed an implicit time step? I'd like to see where in my domain most of the errors are coming from. I looked at TSMonitor but that doesn't seem to give me access to the residual at the end of the current time step.
> 
> Thanks,
> Mani