Re: [petsc-users] Modifying Entries Tied to Specific Points in Finite Element Stiffness Matrix using DMPlex

On Fri, Dec 9, 2022 at 10:51 AM Hongrui Yu wrote: > Thank you for your reply! Unfortunately yes.. I’ll need to modify > stiffness between nodes on the boundary so most of them are going to be in > completely general location. > Hmm, there is usually a better way to do this. This is a mesh and

Re: [petsc-users] Modifying Entries Tied to Specific Points in Finite Element Stiffness Matrix using DMPlex

Thank you for your reply! Unfortunately yes.. I’ll need to modify stiffness between nodes on the boundary so most of them are going to be in completely general location. I can create an IS after distribution using DMPlexCreatePointNumbering() but they are Global numbering. Is there a way to

Re: [petsc-users] Modifying Entries Tied to Specific Points in Finite Element Stiffness Matrix using DMPlex

On Thu, Dec 8, 2022 at 6:06 PM Hongrui Yu wrote: > Hello! I’m trying to adapt a serial Finite Element code using PETSc. In > this code it reads in special stiffness terms between the boundary DoFs > from an input file, and add them to corresponding locations in the global > Jacobian matrix. >

[petsc-users] Modifying Entries Tied to Specific Points in Finite Element Stiffness Matrix using DMPlex

Hello! I'm trying to adapt a serial Finite Element code using PETSc. In this code it reads in special stiffness terms between the boundary DoFs from an input file, and add them to corresponding locations in the global Jacobian matrix. I currently use a DM Plex object to store the mesh information.