Dear all,
I try to create a compatible sparse MPI matrix A with dmplex global vector x,
so I can do matrix-vector multiplication y = A*x.
I think I can first get the local and global sizes of x on comm, say n and N,
also sizes of y, m, M,
then create A by using MatCreate(comm, &A), set the si
From: knep...@gmail.com
Sent: Sunday, June 18, 2023 20:35
To: Duan Junming
Cc: petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Advice on small block matrix vector multiplication
On Sun, Jun 18, 2023 at 2:13 PM Duan Junming via petsc-users
mailto:petsc-users@mcs.anl.gov>> wrote:
Dear a
Dear all,
I am using DMPlex to manage the unknowns, two fields, one for pressure, and one
for velocities with two/three components, defined in each cell. They're
represented by polynomials, with N (10~50) dofs for each component.
I have an operator which can be written in a matrix form (N-by-N,
Dear Jed,
Thank you for your help!
Now I moved the line using "DMViewFromOptions" after the function
"PetscDSSetObjective",
and it works for "-dm_coord_petscspace_degree 3 -petscspace_degree 3".
But when I tried degree 4:
./ex33 -dm_plex_simplex 0 -dm_plex_box_faces 1,1 -mesh_transform annu
Dear Jed,
Thank you for the suggestion.
When I run tests/ex33.c with
./ex33 -dm_plex_simplex 0 -dm_plex_box_faces 1,1 -mesh_transform annulus
-dm_coord_space 0 -dm_coord_petscspace_degree 3 -dm_refine 1 -dm_view
cgns:test.cgns
and load it using Paraview,
the mesh is still with straight line
:34:24 PM
To: Duan Junming
Cc: petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] dm_view of high-order geometry/solution
On Mon, Jun 12, 2023 at 4:13 AM Duan Junming via petsc-users
mailto:petsc-users@mcs.anl.gov>> wrote:
Dear all,
I am playing with dm/impls/plex/tests/ex33.c and know
Dear all,
I am playing with dm/impls/plex/tests/ex33.c and know how to set high-order
geometry.
Is it possible to output the final mesh to vtu, e.g. annulus example?
Thanks!
Junming
Dear all,
I have a simple demo code attached below, which gives a segmentation violation
error.
Can you help me with this problem? I think the problem is due to the destroy
function.
I am using version 3.19.2 with debugging.
#include
static char help[] = "test.\n";
int main(int argc, char
Dear all,
I need to use Q3 tensor product Hermite element in 2D (point value, gradient,
and mixed derivative at 4 vertices in a cell as unknowns).
Is it available in PETSc FEM module now? I found that only Lagrange element is
available.
If not, what is the correct path to implement Q3 tensor
Dear all,
I am using PETSc 3.17.4 on a Linux server, compiling with --download-exodus
--download-hdf5 --download-openmpi --download-triangle --with-fc=0
--with-debugging=0 PETSC_ARCH=arch-linux-c-opt COPTFLAGS="-g -O3"
CXXOPTFLAGS="-g -O3".
The strange thing is when I run my code with mpirun -n
at 8:46 AM Duan Junming via petsc-users
mailto:petsc-users@mcs.anl.gov>> wrote:
Dear all,
I want to add more dofs to the coordinate DM to represent a curved mesh.
I first create a simple box mesh with one cell:
PetscCall(DMCreate(comm, &dm));
PetscCall(DMSetType(dm, DMPLEX));
Dear all,
I want to add more dofs to the coordinate DM to represent a curved mesh.
I first create a simple box mesh with one cell:
PetscCall(DMCreate(comm, &dm));
PetscCall(DMSetType(dm, DMPLEX));
dim = 2;
PetscInt n_faces[2] = {1, 1};
DMBoundaryType periodicity[2] = {DM_BOUNDARY_GHO
Dear community,
I create a 1D uniform mesh (3 cells) using DMDA with periodic boundary like
this:
x --- x --- x ---
0 1 2
When I output with HDF5 viewer, the solutions "0, 1, 2" are written to the file.
Because I want to do the visualization, I wonder is it possible to write the
s
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