Brad Aagaard via petsc-dev <petsc-dev@mcs.anl.gov> writes: > Q2 is often useful in problems with body forces (such as gravitational > body forces), which tend to have linear variations in stress.
It's similar on the free-surface Stokes side, where pressure has a linear gradient and must be paired with a stable velocity space. Regarding elasticity, it would be useful to have collect some application problems where Q2 shows a big advantage. We should be able to solve Q2 at the same or lower cost per dof to Q1 (multigrid for this case isn't off-the-shelf at present, but it's something we're working on). > On 8/14/19 2:51 PM, Mark Adams via petsc-dev wrote: >> >> >> Do you have any applications that specifically want Q2 (versus Q1) >> elasticity or have some test problems that would benefit? >> >> >> No, I'm just trying to push things.
