Thank you, I used these routines to setup a CN type TS. The problem I face now is that I seem to be unable to access the temporal derivatives u_t[..] for the definition of the residuals. I get a segmentation violation inside the PetscFEIntegrateResidual routine whenever I try to. I have attached the error message below. Also, I am wondering whether it is possible to update the neumann boundary condition of the FE object for each timestep. This would be useful for coupling purposes.
Thank you, Max [0]PETSC ERROR: ------------------------------------------------------------------------ [0]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation, probably memory access out of range [0]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger [0]PETSC ERROR: or see http://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind [0]PETSC ERROR: or try http://valgrind.org on GNU/linux and Apple Mac OS X to find memory corruption errors [0]PETSC ERROR: likely location of problem given in stack below [0]PETSC ERROR: --------------------- Stack Frames ------------------------------------ [0]PETSC ERROR: Note: The EXACT line numbers in the stack are not available, [0]PETSC ERROR: INSTEAD the line number of the start of the function [0]PETSC ERROR: is given. [0]PETSC ERROR: [0] PetscFEIntegrateResidual_Basic line 3503 /Users/maxhartig/PETSc/src/dm/dt/interface/dtfe.c [0]PETSC ERROR: [0] PetscFEIntegrateResidual line 5753 /Users/maxhartig/PETSc/src/dm/dt/interface/dtfe.c [0]PETSC ERROR: [0] DMPlexComputeResidual_Internal line 1706 /Users/maxhartig/PETSc/src/snes/utils/dmplexsnes.c [0]PETSC ERROR: [0] DMPlexSNESComputeResidualFEM line 2152 /Users/maxhartig/PETSc/src/snes/utils/dmplexsnes.c [0]PETSC ERROR: [0] SNESComputeFunction_DMLocal line 65 /Users/maxhartig/PETSc/src/snes/utils/dmlocalsnes.c [0]PETSC ERROR: [0] SNES user function line 2144 /Users/maxhartig/PETSc/src/snes/interface/snes.c [0]PETSC ERROR: [0] SNESComputeFunction line 2129 /Users/maxhartig/PETSc/src/snes/interface/snes.c [0]PETSC ERROR: [0] SNESSolve_NEWTONLS line 150 /Users/maxhartig/PETSc/src/snes/impls/ls/ls.c [0]PETSC ERROR: [0] SNESSolve line 3961 /Users/maxhartig/PETSc/src/snes/interface/snes.c [0]PETSC ERROR: [0] TS_SNESSolve line 188 /Users/maxhartig/PETSc/src/ts/impls/implicit/theta/theta.c [0]PETSC ERROR: [0] TSStep_Theta line 206 /Users/maxhartig/PETSc/src/ts/impls/implicit/theta/theta.c [0]PETSC ERROR: [0] TSStep line 3700 /Users/maxhartig/PETSc/src/ts/interface/ts.c [0]PETSC ERROR: [0] TSSolve line 3921 /Users/maxhartig/PETSc/src/ts/interface/ts.c [0]PETSC ERROR: --------------------- Error Message -------------------------------------------------------------- [0]PETSC ERROR: Signal received [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for trouble shooting. [0]PETSC ERROR: Petsc Release Version 3.7.2, unknown [0]PETSC ERROR: Configure options --download-triangle [0]PETSC ERROR: #1 User provided function() line 0 in unknown file application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0 [unset]: write_line error; fd=-1 buf=:cmd=abort exitcode=59 > On 03 Aug 2016, at 16:44, Matthew Knepley <knep...@gmail.com> wrote: > > On Tue, Aug 2, 2016 at 8:22 AM, Maximilian Hartig <imilian.har...@gmail.com > <mailto:imilian.har...@gmail.com>> wrote: > Hello all, > > I would like to run a transient problem with PetscFE. Example ex11.c seems > relevant since it uses the PestcFV context to create boundary conditions and > RHS Functions for the TS. > Is there an easy way to do transient analysis with TS and petscFE or do I > have to code my own time-stepping routine? > > You can use > > ierr = DMTSSetBoundaryLocal(adaptedDM, DMPlexTSComputeBoundary, > user);CHKERRQ(ierr); > ierr = DMTSSetIFunctionLocal(adaptedDM, DMPlexTSComputeIFunctionFEM, > user);CHKERRQ(ierr); > ierr = DMTSSetIJacobianLocal(adaptedDM, DMPlexTSComputeIJacobianFEM, > user);CHKERRQ(ierr); > > I have been meaning to write a heat equation example, but I have not finished > yet, > > Thanks, > > Matt > > Thanks, > Max > > > > -- > What most experimenters take for granted before they begin their experiments > is infinitely more interesting than any results to which their experiments > lead. > -- Norbert Wiener
