On 12/08/2022 18:15, Matthew Knepley wrote:
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On Fri, Aug 12, 2022 at 9:27 AM David Scott wrote:
On 12/08/2022
On 12/08/2022 11:26, Matthew Knepley wrote:
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On Fri, Aug 12, 2022 at 2:21 AM Quynh Nguyen
mailto:nguyenquynh9...@gmai
document suggests 1MB is a good option.
Lawrence
On Fri, 26 Nov 2021 at 15:10, David Scott wrote:
Hello,
I am trying to write out HDF5 files. The program I have works all
right
up to a point but then fails when I double the size of the file that I
am trying to write out. I
Hello,
I am trying to write out HDF5 files. The program I have works all right
up to a point but then fails when I double the size of the file that I
am trying to write out. I have attached a file containing the error
message and another file containing the short program that I used to
generate i
Hello,
I am specifying an options file on the command line with '-options_file
'. I would like the program to write out to
stdout. Is there a simple way to do this?
I thought that I would be able interrogate the options database to
obtain the file name but, whilst the file is definitely being r
Matt,
I'll have a go at writing Xdmf files.
Am I right in thinking that VTK files are written sequentially?
Thanks,
David
On 09/07/2020 20:17, Matthew Knepley wrote:
On Thu, Jul 9, 2020 at 2:51 PM David Scott <mailto:d.sc...@epcc.ed.ac.uk>> wrote:
Hello,
I have wri
I should have said that I have created files with the suffix '.h5'. Was
that the right thing to do?
David
On 09/07/2020 19:50, David Scott wrote:
Hello,
I have written out a Vec using the (Fortran) HDF5 routines provided by
PETSc.
I now want to import the data into ParaView 5.8.0 a
Hello,
I have written out a Vec using the (Fortran) HDF5 routines provided by
PETSc.
I now want to import the data into ParaView 5.8.0 and display a contour.
I can read the data in using VisItPixieReader but the contour tool is
not available. Can I use the HDF5 files produced by PETSc 13.3.3 with
ding something?
Thanks,
Matt
Thanks,
David
On 18/02/2020 12:42, Matthew Knepley wrote:
On Tue, Feb 18, 2020 at 6:03 AM David Scott
mailto:d.sc...@epcc.ed.ac.uk>> wrote:
Hello,
I wish to solve a channel flow problem with different boundary
Hello,
I wish to solve a channel flow problem with different boundary
conditions. In the streamwise direction I may have periodic or
inlet/outlet BCs. I would like to make my code for the two cases as
similar as possible. If I use DM_BOUNDARY_PERIODIC then when performing
a linear solve the ghost
Hello,
In my code I have
call KSPSetComputeOperators(ksp_u, compute_matrix_u,
PETSC_NULL_OBJECT, ierr)
later I have something like
call KSPSolve(ksp_u, RHS_u_vec, u3_vec, ierr)
call DMCreateMatrix(da_u, B, ierr)
call compute_matrix_u(ksp_u, B, B, PETSC_NULL_INTEGER, ierr)
call KSPG
n 11, 2015 at 6:48 AM, David Scott <mailto:d.sc...@ed.ac.uk>> wrote:
Hello,
I am using MINRES with GAMG and have supplied various options
#PETSc Option Table entries:
-ksp_max_it 500
-ksp_monitor_true_residual
-log_summary
-mg_levels_ksp_max_it 2
Hello,
I am using MINRES with GAMG and have supplied various options
#PETSc Option Table entries:
-ksp_max_it 500
-ksp_monitor_true_residual
-log_summary
-mg_levels_ksp_max_it 2
-mg_levels_ksp_type chebyshev
-mg_levels_pc_type sor
-options_left
-pc_gamg_agg_nsmooths 1
-pc_gamg_threshold 0.03
-pc
On 12/12/2014 16:07, Matthew Knepley wrote:
On Fri, Dec 12, 2014 at 8:58 AM, David Scott <mailto:d.sc...@ed.ac.uk>> wrote:
How can I get GAMG to take into account the fact that I have more
than one degree of freedom per node when it is producing a coarser
grid? I am deali
How can I get GAMG to take into account the fact that I have more than
one degree of freedom per node when it is producing a coarser grid? I am
dealing with a problem in structural mechanics and have an unstructued
grid. The matrix is read from a file produced by another application.
The compon
On 03/05/2013 15:16, David Scott wrote:
> I have inserted
> call PetscViewerBinaryOpen(PETSC_COMM_WORLD, 'DifficultSystem', &
>FILE_MODE_WRITE, viewer, ierr)
> call KSPGetOperators(ksp, A, PETSC_NULL_OBJECT, &
>PETSC_NULL_INTEGER, ie
Barry,
On 23/04/2013 02:36, Barry Smith wrote:
>
> On Apr 22, 2013, at 11:26 AM, David Scott wrote:
>
>> Thanks for the suggestion.
>>
>> I had tried '-pc_type gamg -pc_gamg_agg_nsmooths 1' with an earlier version
>> of the code without success.
Hello Barry,
On 23/04/2013 02:36, Barry Smith wrote:
>David,
>
> We would be very interested in determining what is "going wrong" with
> the solver here since we hope to make it robust. Would it be possible for
> you to use a MatView() and VecView() on the matrix and the right hand sid
uces physically sensible results.
David
On 22/04/2013 13:12, Matthew Knepley wrote:
> On Mon, Apr 22, 2013 at 7:56 AM, David Scott <mailto:d.scott at ed.ac.uk>> wrote:
>
> Hello,
>
> I am working on a fluid-mechanical code to solve the two-phase
> Navier?Stokes e
.
If I use GMRES for the first few thousand time steps and then swap to CG
it does converge but the speed of execution is somewhat reduced.
I have attached relevant excerpts from the code.
Yours sincerely,
David Scott
--
Dr. D. M. Scott
Applications Consultant
Edinburgh Parallel Computing Centre
d. (Indeed, consider the family of problems in which you
>> extend the domain in that patch and apply _any_ boundary conditions in
>> the extended domain. All of those solutions are also solutions of your
>> problem with "second derivative is zero" on your "boundary&
ith implementation
> details.
>
>
> On Thu, Jan 10, 2013 at 9:03 AM, David Scott <mailto:d.scott at ed.ac.uk>> wrote:
>
> Hello,
>
> I am solving Poisson's equation (actually Laplace's equation in this
> simple test case) on a 3D structured gri
Hello,
I am solving Poisson's equation (actually Laplace's equation in this
simple test case) on a 3D structured grid. The boundary condition in the
first dimension is periodic. In the others there are Von Neumann
conditions except for one surface where the second derivative is zero. I
have sp
I wish to set boundary values in a structured grid. How do I do this if
I am using DMDA_BOUNDARY_GHOSTED? I thought that I should set the
boundary values in the function specified by a call to DMSetInitialGuess
but it appears to be passed a global vector.
I would prefer any example code to be i
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