Yes. I would like to a rotational BCs(Twist bcs).
Such a boundary is needed to reduce the computational domain. Thanks lot Best regards Fengwen ____________________________________________________ Senior Researcher Department of Mechanical Engineering, DTU Nils Koppels Allé Building 404 2800 Kgs. Lyngby [email protected] ________________________________ From: Lawrence Mitchell <[email protected]> Sent: Monday, October 29, 2018 1:17:34 PM To: Matt Knepley Cc: Fengwen Wang; PETSc; PETSc Subject: Re: [petsc-users] [petsc-maint] How to impose boundary conditions using DMDA > On 29 Oct 2018, at 10:56, Matthew Knepley <[email protected]> wrote: > > You can certainly map the right edge to the top edge (its topologically a > square again), but that > mapping is not smooth, and I do not know how you would make a global basis > for the approximation space. Yeah, I thought this was topologically just a cone, but that would have: u(x=1) = -v(y=1) and v(x=1) = u(y=1) (note matching sign). So if you wanted the v(x=1) = -u(y=1) there would be a twist somehow, and then a discontinuity in the mapping. Lawrence
