deal.II User Group

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Welcome to the deal.II mailing list. If you are new to the mailing list, please take the time to read these posts: Getting started and posting guidelines for new users and deal.II discussion group: Feedback and guidelines.
deal.II website: http://dealii.org

Github: https://github.com/dealii/dealii

Please fill in the user survey: https://forms.gle/TxFL5SAGDuN8hB3C7

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Jean-Paul Pelteret

6/30/16

Announcement

Getting started and posting guidelines for new users

Hi there, and welcome to the deal.II user group forum! Presumably you've found yourself here from

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news

Announcement

Getting started and posting guidelines for new users

Hi there, and welcome to the deal.II user group forum! Presumably you've found yourself here from

6/30/16

Jean-Paul Pelteret2

8/13/15

Announcement

deal.II discussion group: Feedback and guidelines

Dear deal.II users, During the user group meeting held in Texas at the beginning of August we asked

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news

Announcement

deal.II discussion group: Feedback and guidelines

Dear deal.II users, During the user group meeting held in Texas at the beginning of August we asked

8/13/15

Jihuan Tian, … Wolfgang Bangerth9

Jan 1

HierBEM: A 3D Galerkin BEM library based on deal.II

Hello Prof. Wolfgang, Thanks for your suggestions! I'll start the integration in an incremental

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HierBEM: A 3D Galerkin BEM library based on deal.II

Hello Prof. Wolfgang, Thanks for your suggestions! I'll start the integration in an incremental

Jan 1

Praveen C, … Daniel Arndt7

12/29/25

collect_periodic_faces slow on large grids and in parallel

On Fri, Dec 26, 2025 at 6:41 PM 'Wolfgang Bangerth' via deal.II User Group <dealii@

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collect_periodic_faces slow on large grids and in parallel

On Fri, Dec 26, 2025 at 6:41 PM 'Wolfgang Bangerth' via deal.II User Group <dealii@

12/29/25

Gerald Marewo, blais...@gmail.com5

12/27/25

My last attempt with candi fails towards the end

Dear BB and others, I now know that I have BLAS installed: (base) gerald@hephaestus:~$ dnf search

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My last attempt with candi fails towards the end

Dear BB and others, I now know that I have BLAS installed: (base) gerald@hephaestus:~$ dnf search

12/27/25

Yiliang Wang, Wolfgang Bangerth9

12/20/25

Truncation errors when using petsc in dealii

No problem, Dr. Bangerth. I will submit a patch to fix this issue. Bests, Yiliang Wang On Sat, Dec 20

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Truncation errors when using petsc in dealii

No problem, Dr. Bangerth. I will submit a patch to fix this issue. Bests, Yiliang Wang On Sat, Dec 20

12/20/25

Rene Gassmoeller

12/18/25

deal.II Newsletter #340

Hello everyone! This is deal.II newsletter #340. It automatically reports recently merged features

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deal.II Newsletter #340

Hello everyone! This is deal.II newsletter #340. It automatically reports recently merged features

12/18/25

Nihar Bhardwaj Darbhamulla, Wolfgang Bangerth5

12/17/25

Questions regarding parallel::shared::Triangulation and partitioning

On 12/16/25 14:05, Nihar Bhardwaj Darbhamulla wrote: > > I've tried two things with single

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Questions regarding parallel::shared::Triangulation and partitioning

On 12/16/25 14:05, Nihar Bhardwaj Darbhamulla wrote: > > I've tried two things with single

12/17/25

Davit Gyulamiryan2

12/15/25

Multigrid with adaptive refinement and inner face batches in matrix-free

Edit: I am also using matrix-free operators some of which require iterating over the inner cell

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Multigrid with adaptive refinement and inner face batches in matrix-free

Edit: I am also using matrix-free operators some of which require iterating over the inner cell

12/15/25

Rene Gassmoeller

12/10/25

deal.II Newsletter #339

Hello everyone! This is deal.II newsletter #339. It automatically reports recently merged features

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deal.II Newsletter #339

Hello everyone! This is deal.II newsletter #339. It automatically reports recently merged features

12/10/25

Jakob Nielsen, Luca Heltai4

12/5/25

Galerkin BEM in deal.II

Dear Jakob, yes, this is roughly how we do it. You have a list of possible quadrature point selection

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Galerkin BEM in deal.II

Dear Jakob, yes, this is roughly how we do it. You have a list of possible quadrature point selection

12/5/25

Rene Gassmoeller

12/3/25

deal.II Newsletter #338

Hello everyone! This is deal.II newsletter #338. It automatically reports recently merged features

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deal.II Newsletter #338

Hello everyone! This is deal.II newsletter #338. It automatically reports recently merged features

12/3/25

Nihar Bhardwaj Darbhamulla, Wolfgang Bangerth10

12/2/25

Problem with scaling with parallel::distributed::Triangulation and direct solver

Thank you for your help Professor Wolfgang. Regards, Nihar On Tuesday, 18 November 2025 at 10:19:51

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Problem with scaling with parallel::distributed::Triangulation and direct solver

Thank you for your help Professor Wolfgang. Regards, Nihar On Tuesday, 18 November 2025 at 10:19:51

12/2/25

Davit Gyulamiryan2

11/29/25

Incompatibility of MatrixFreeTools::compute_matrix() with PETScWrappers::MPI::SparseMatrix

I found the problem - the setup of the sparsity pattern was incorrect. The fixed code is below:

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Incompatibility of MatrixFreeTools::compute_matrix() with PETScWrappers::MPI::SparseMatrix

I found the problem - the setup of the sparsity pattern was incorrect. The fixed code is below:

11/29/25

Abbas Ballout, Luca Heltai4

11/29/25

Functions::Parsed<dim> flexibility and Functions<dim> performance

Dear Luca, Just reporting back: My function evaluations now are 1.5x-2.0x slower with symegine

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Functions::Parsed<dim> flexibility and Functions<dim> performance

Dear Luca, Just reporting back: My function evaluations now are 1.5x-2.0x slower with symegine

11/29/25

Rene Gassmoeller

11/25/25

deal.II Newsletter #337

Hello everyone! This is deal.II newsletter #337. It automatically reports recently merged features

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deal.II Newsletter #337

Hello everyone! This is deal.II newsletter #337. It automatically reports recently merged features

11/25/25

Arthur Bawin, Wolfgang Bangerth4

11/20/25

Removing from existing AffineConstraints

I'm a bit confused then. The following tests three get_view() with IndexSets : your example (

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Removing from existing AffineConstraints

I'm a bit confused then. The following tests three get_view() with IndexSets : your example (

11/20/25

Lukas Dreyer, … Wolfgang Bangerth11

11/19/25

Implementing a Nédélec Finite Element for Triangles and Tetrahedra

Hi Lukas: > I still have one main point that I do not understand about both current > nedelec

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Implementing a Nédélec Finite Element for Triangles and Tetrahedra

Hi Lukas: > I still have one main point that I do not understand about both current > nedelec

11/19/25

jack urombo, Marc Fehling2

11/19/25

deal II in Docker Permission

Hi Jack, I believe the correct command is `docker run --user root` Marc On Wednesday, November 19,

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deal II in Docker Permission

Hi Jack, I believe the correct command is `docker run --user root` Marc On Wednesday, November 19,

11/19/25

Rene Gassmoeller

11/18/25

deal.II Newsletter #336

Hello everyone! This is deal.II newsletter #336. It automatically reports recently merged features

unread,

deal.II Newsletter #336

Hello everyone! This is deal.II newsletter #336. It automatically reports recently merged features

11/18/25

Hang ZHANG2

11/12/25

Compiling deal.ii with candi on a cluster with cray programming environment

Hi all, The issue has been resolved, the problem was in the configuration file deal.II-toolchain/

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Compiling deal.ii with candi on a cluster with cray programming environment

Hi all, The issue has been resolved, the problem was in the configuration file deal.II-toolchain/

11/12/25

Rene Gassmoeller

11/10/25

deal.II Newsletter #335

Hello everyone! This is deal.II newsletter #335. It automatically reports recently merged features

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deal.II Newsletter #335

Hello everyone! This is deal.II newsletter #335. It automatically reports recently merged features

11/10/25

Weidong Pian, Wolfgang Bangerth2

11/8/25

Questions encountered in Adaptively Refining Mesh

On 11/7/25 20:17, 'Weidong Pian' via deal.II User Group wrote: > > I'm studying

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Questions encountered in Adaptively Refining Mesh

On 11/7/25 20:17, 'Weidong Pian' via deal.II User Group wrote: > > I'm studying

11/8/25

Kyle Schwiebert, Matthias Maier3

11/7/25

Linking unoptimized user code against release deal.II

Matthias, Thank you for the reply. In retrospect such a solution should have been obvious. I knew

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Linking unoptimized user code against release deal.II

Matthias, Thank you for the reply. In retrospect such a solution should have been obvious. I knew

11/7/25

Arthur Bawin, … Timo Heister6

11/6/25

WorkStream with read-only PETSc parallel vectors

Dear Arthur, See https://github.com/dealii/dealii/issues/18886 Basically, even reading from PETSc

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WorkStream with read-only PETSc parallel vectors

Dear Arthur, See https://github.com/dealii/dealii/issues/18886 Basically, even reading from PETSc

11/6/25

Tingchang Yin, Wolfgang Bangerth3

11/4/25

CDR solver: exception happens when using MPI

On 11/4/25 04:48, Tingchang Yin wrote: > > I downloaded the convection diffusion reaction

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CDR solver: exception happens when using MPI

On 11/4/25 04:48, Tingchang Yin wrote: > > I downloaded the convection diffusion reaction

11/4/25

Sebastian Kinnewig, blais...@gmail.com2

10/31/25

Installing deal.II with a single command, introducing DCS2

That looks super interesting! We will for sure give it a try and report any issues if there are any :

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Installing deal.II with a single command, introducing DCS2

That looks super interesting! We will for sure give it a try and report any issues if there are any :

10/31/25

Hélène Papillon Laroche, Wolfgang Bangerth5

10/30/25

DoF indices of a hanging node

Thank you, it works! Best, Hélène Le mardi 28 octobre 2025 à 13:33:42 UTC-4, Wolfgang Bangerth a

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DoF indices of a hanging node

Thank you, it works! Best, Hélène Le mardi 28 octobre 2025 à 13:33:42 UTC-4, Wolfgang Bangerth a

10/30/25

Rene Gassmoeller

10/27/25

deal.II Newsletter #334

Hello everyone! This is deal.II newsletter #334. It automatically reports recently merged features

unread,

deal.II Newsletter #334

Hello everyone! This is deal.II newsletter #334. It automatically reports recently merged features

10/27/25

Arthur Bawin, Wolfgang Bangerth5

10/20/25

Coupling issue in fluid-structure interaction test

On 10/20/25 16:10, Arthur Bawin wrote: > > If the coupling is enforced by simply modifying the

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Coupling issue in fluid-structure interaction test

On 10/20/25 16:10, Arthur Bawin wrote: > > If the coupling is enforced by simply modifying the

10/20/25

Rene Gassmoeller

10/17/25

deal.II Newsletter #333

Hello everyone! This is deal.II newsletter #333. It automatically reports recently merged features

unread,

deal.II Newsletter #333

Hello everyone! This is deal.II newsletter #333. It automatically reports recently merged features

10/17/25

blais...@gmail.com

10/15/25

Lethe v1.0 official release

We are proud to announce the v1.0.2 release of Lethe as well as the publication of its release paper

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Lethe v1.0 official release

We are proud to announce the v1.0.2 release of Lethe as well as the publication of its release paper

10/15/25