John, I wasn't too sure how to accomplish that, but here is the main file. This is a module in a larger code, but the function I'm looking at is "assemble_pressure". https://github.com/CalebPhillips5/ABM_Ang/blob/master/pressure_ABM . In this instance I'm just trying to set the top boundary to 1 and the bottom boundary to 0 with 2nd order elements.
Cheers, Caleb On Wed, Jul 8, 2020 at 5:10 PM John Peterson <jwpeter...@gmail.com> wrote: > > > On Wed, Jul 8, 2020 at 4:48 PM Caleb M Phillips <calebphill...@utexas.edu> > wrote: > >> Hey all, >> >> Quick question that is completely throwing me for a loop. I'm working on a >> poisson equation for pressure and wanting to specify dirichlet boundary >> conditions. I used the penalty method (per libmesh documentation), and it >> works beautifully, aka matches the real solution. However, when I change >> to >> 2nd order polynomials, everything falls apart. The penalty method does >> implement the boundary conditions, but the solution is complete garbage. >> >> Any explanation for changing (.., FIRST) to (.., SECOND) and the solution >> (the code runs fine) but the solution being garbage? >> > > > I just ran introduction_ex3, which uses penalty BCs and second-order > elements, and wrote the result to an Exodus file, and it looks OK to me. > > So my guess is it's a bug of some sort in your code. Is it possible for > you to share it somehow? > > -- > John > > _______________________________________________ Libmesh-users mailing list Libmesh-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmesh-users
