# Latest **URL:** https://bempp.discourse.group/latest.md?page=4 [Latest](https://bempp.discourse.group/latest.md) · [Categories](https://bempp.discourse.group/categories.md) **Page:** 5 --- ## [Is it worth using gpu on boundary operators?](https://bempp.discourse.group/t/is-it-worth-using-gpu-on-boundary-operators/76)
**Author:** [@Varoloc](https://bempp.discourse.group/u/Varoloc)\ **Replies:** 0\ **Last updated:** [21 April 2021 16:36 UTC](https://bempp.discourse.group/t/is-it-worth-using-gpu-on-boundary-operators/76 "2021-04-21T16:36:26Z")
I was checking out the Bempp OpenCL performance benchmarks and it got me thinking why bemp.api.POTENTIAL\_OPERATOR\_DEVICE\_TYPE = ‘gpu’ was tested but no bemp.api.BOUNDARY\_OPERATOR\_DEVICE\_TYPE = ‘gpu’ was included in the… --- ## [System Deflation](https://bempp.discourse.group/t/system-deflation/74)
**Author:** [@Peter](https://bempp.discourse.group/u/Peter)\ **Replies:** 1\ **Last updated:** [16 April 2021 10:42 UTC](https://bempp.discourse.group/t/system-deflation/74 "2021-04-16T10:42:24Z")
Dear bempp-cl team, When solving a problem for the electric potential I have a system that is in principle singular. My system is (0.5M+DLP)\\phi = F, where M is the identity operator (or mass matrix), DLP is the double… --- ## [How to compute the solution gradient on the boundary](https://bempp.discourse.group/t/how-to-compute-the-solution-gradient-on-the-boundary/73)
**Author:** [@arovinelli](https://bempp.discourse.group/u/arovinelli)\ **Replies:** 0\ **Last updated:** [10 April 2021 01:47 UTC](https://bempp.discourse.group/t/how-to-compute-the-solution-gradient-on-the-boundary/73 "2021-04-10T01:47:57Z")
Hi there, I need to compute what is generally referred to as du/dn. Using some math I can get away with it by computing grad(u) \\dot n . However, i can’t find any operator/API computing either the former or the latter. … --- ## [Scattering by infinitely long bodies](https://bempp.discourse.group/t/scattering-by-infinitely-long-bodies/71)
**Author:** [@Varoloc](https://bempp.discourse.group/u/Varoloc)\ **Replies:** 0\ **Last updated:** [6 April 2021 16:42 UTC](https://bempp.discourse.group/t/scattering-by-infinitely-long-bodies/71 "2021-04-06T16:42:44Z")
Dear bempp-cl team, I have been trying to implement plane wave scattering by infinitely long bodies using G(x,y)=\\frac{j}{4}H\_{0}^{(2)}(k\_{b}|x-y|) instead of the Green’s function of a three-dimensional Helmholtz proble… --- ## [Alternative formulation of Maxwell equation](https://bempp.discourse.group/t/alternative-formulation-of-maxwell-equation/62)
**Author:** [@piman](https://bempp.discourse.group/u/piman)\ **Replies:** 2\ **Last updated:** [16 February 2021 11:56 UTC](https://bempp.discourse.group/t/alternative-formulation-of-maxwell-equation/62 "2021-02-16T11:56:42Z")
Hi everybody, I wonder, is it possible to apply bempp to solve Maxwell equation in alternative formulation I found in article “Overcoming Low-Frequency Breakdown of the Magnetic Field Integral Equation” https://doi.org/… --- ## [Exporting Calculated Solution as Arrays of Indices](https://bempp.discourse.group/t/exporting-calculated-solution-as-arrays-of-indices/64)
**Author:** [@gwang4](https://bempp.discourse.group/u/gwang4)\ **Replies:** 1\ **Last updated:** [12 February 2021 10:07 UTC](https://bempp.discourse.group/t/exporting-calculated-solution-as-arrays-of-indices/64 "2021-02-12T10:07:35Z")
Hello, I have calculated a solution for Laplace’s equation (for electric field) using Dirichlet boundary conditions, and am able to generate a Trisurf Plot of the solution within Jupyter. Is there a way to export this d… --- ## [Grid function coefficients](https://bempp.discourse.group/t/grid-function-coefficients/49)
**Author:** [@Peter](https://bempp.discourse.group/u/Peter)\ **Replies:** 3\ **Last updated:** [1 February 2021 11:01 UTC](https://bempp.discourse.group/t/grid-function-coefficients/49 "2021-02-01T11:01:44Z")
Hi all, For my project I am interested in improving the accuracy of my solution with higher order functions, therefore I am restricted to using the legacy version of bempp. My question is about coefficients, both in th… --- ## [Problems running the tutorials/examples](https://bempp.discourse.group/t/problems-running-the-tutorials-examples/60)
**Author:** [@DAWardle](https://bempp.discourse.group/u/DAWardle)\ **Replies:** 0\ **Last updated:** [1 February 2021 07:08 UTC](https://bempp.discourse.group/t/problems-running-the-tutorials-examples/60 "2021-02-01T07:08:21Z")
Hi everyone. I’m not sure if I have a bug or just need help, so I’m not sure if I should be posting on GitHub/issues or this discourse — apologies if I’m posting in the wrong place. I want to solve an electromagnetic s… --- ## [Slow Maxwell FMM](https://bempp.discourse.group/t/slow-maxwell-fmm/56)
**Author:** [@mandyxmq](https://bempp.discourse.group/u/mandyxmq)\ **Replies:** 1\ **Last updated:** [27 January 2021 00:59 UTC](https://bempp.discourse.group/t/slow-maxwell-fmm/56 "2021-01-27T00:59:18Z")
I’m using bempp-cl 0.2.2 and trying to use FMM for Electromagnetic scattering problems. I created a test based on the maxwell\_dielectric tutorial example (I changed two spheres to one and changed some parameters). I obse… --- ## [At which grid size does FMM become 'worth it'?](https://bempp.discourse.group/t/at-which-grid-size-does-fmm-become-worth-it/50)
**Author:** [@Rasmus](https://bempp.discourse.group/u/Rasmus)\ **Replies:** 4\ **Last updated:** [7 January 2021 13:41 UTC](https://bempp.discourse.group/t/at-which-grid-size-does-fmm-become-worth-it/50 "2021-01-07T13:41:15Z")
Hi everyone. Thanks a lot for all the help so far. I’m (still) doing Helmholtz scattering on a rigid object. I’m using somewhat large grid’s, and my simulations takes a long time to compute. import time import bempp.ap… --- ## [Placing monopole source at or near boundary](https://bempp.discourse.group/t/placing-monopole-source-at-or-near-boundary/47)
**Author:** [@Rasmus](https://bempp.discourse.group/u/Rasmus)\ **Replies:** 2\ **Last updated:** [30 November 2020 18:16 UTC](https://bempp.discourse.group/t/placing-monopole-source-at-or-near-boundary/47 "2020-11-30T18:16:47Z")
Hi I’m using BEMPP to solve the exterior Helmholtz problem a single point on a surface but for many incident directions. I would like to, instead of solving the linear system N times for all source position and keeping… --- ## [BEM-BEM coupling with complex wavenumber and density](https://bempp.discourse.group/t/bem-bem-coupling-with-complex-wavenumber-and-density/43)
**Author:** [@luizaugustoalvim](https://bempp.discourse.group/u/luizaugustoalvim)\ **Replies:** 8\ **Last updated:** [23 November 2020 15:58 UTC](https://bempp.discourse.group/t/bem-bem-coupling-with-complex-wavenumber-and-density/43 "2020-11-23T15:58:21Z")
Greetings everyone, To contextualize my question, I have asked on the previously used bempp group (https://groups.google.com/g/bempp/c/Tsslj2noIi4) about solving the Helmholtz transmission problem with Bempp and was ref… --- ## [The ACA or other algorithm to accelerate bempp?](https://bempp.discourse.group/t/the-aca-or-other-algorithm-to-accelerate-bempp/42)
**Author:** [@hellojxt](https://bempp.discourse.group/u/hellojxt)\ **Replies:** 1\ **Last updated:** [29 October 2020 16:57 UTC](https://bempp.discourse.group/t/the-aca-or-other-algorithm-to-accelerate-bempp/42 "2020-10-29T16:57:28Z")
Hi, Does bempp support The Adaptive Cross Approximation Algorithm? I can’t find the relevant description in the document. But I saw the relevant introduction in an article citing bempp: When I select the assember as … --- ## [Simple monopole source example gets a wrong result](https://bempp.discourse.group/t/simple-monopole-source-example-gets-a-wrong-result/41)
**Author:** [@hellojxt](https://bempp.discourse.group/u/hellojxt)\ **Replies:** 3\ **Last updated:** [22 October 2020 08:35 UTC](https://bempp.discourse.group/t/simple-monopole-source-example-gets-a-wrong-result/41 "2020-10-22T08:35:07Z")
I am learning to use bempp to solve acoustic problems. I test it with a simple monopole source example: p(x)=\\frac{e^{-i k r}}{4 \\pi r} I use the Fredholm integral equation of the first kind to calculate Dirichlet dat… --- ## [Boundary layer effect](https://bempp.discourse.group/t/boundary-layer-effect/35)
**Author:** [@Sangwoo.Kang](https://bempp.discourse.group/u/Sangwoo.Kang)\ **Replies:** 2\ **Last updated:** [12 October 2020 11:04 UTC](https://bempp.discourse.group/t/boundary-layer-effect/35 "2020-10-12T11:04:16Z")
Hello Thanks to your great project, I’m applying bempp to my project (related to Maxwell equations). Now, the final step only remains that is to calculate the electric field inside of the target with the potential oper… --- ## [Obtaining Solved Solution Data in vtk Format](https://bempp.discourse.group/t/obtaining-solved-solution-data-in-vtk-format/37)
**Author:** [@gwang4](https://bempp.discourse.group/u/gwang4)\ **Replies:** 2\ **Last updated:** [12 October 2020 09:26 UTC](https://bempp.discourse.group/t/obtaining-solved-solution-data-in-vtk-format/37 "2020-10-12T09:26:31Z")
Hello, I am working on simulating Laplace’s equation with Dirichlet Boundary Conditions, specifying the electric potential on the surface. I’m importing a grid I generated in .vtk format and following the documentation … --- ## [FMM Memory Usage Statistics](https://bempp.discourse.group/t/fmm-memory-usage-statistics/32)
**Author:** [@DerekOlson](https://bempp.discourse.group/u/DerekOlson)\ **Replies:** 2\ **Last updated:** [11 October 2020 17:52 UTC](https://bempp.discourse.group/t/fmm-memory-usage-statistics/32 "2020-10-11T17:52:00Z")
Dear bempp-cl team, I would like to be able to track the memory usage (compression) for FMM assembly. In the older version of Bempp, the console logger reported both time per iteration, and memory compression for the H-… --- ## [Masters project ideas](https://bempp.discourse.group/t/masters-project-ideas/30)
**Author:** [@djanekovic](https://bempp.discourse.group/u/djanekovic)\ **Replies:** 1\ **Last updated:** [2 October 2020 16:58 UTC](https://bempp.discourse.group/t/masters-project-ideas/30 "2020-10-02T16:58:21Z")
Hi all, I just posted on github but maybe it makes sense to post similar question here too. I am currently masters student looking for the project for my masters thesis. I am enrolled in CS/Computer Engineering and I am … --- ## [Higher order methods](https://bempp.discourse.group/t/higher-order-methods/20)
**Author:** [@arieder](https://bempp.discourse.group/u/arieder)\ **Replies:** 4\ **Last updated:** [23 September 2020 12:35 UTC](https://bempp.discourse.group/t/higher-order-methods/20 "2020-09-23T12:35:14Z")
Hi, I’m currently working on bringing the FEM-BEM coupling code with NGSolve up to date to the new bempp-cl. So far everything works well, but I’m (somewhat) missing the ability to use higher order shape functions. Sinc… --- ## [How to get your question answered](https://bempp.discourse.group/t/how-to-get-your-question-answered/15)
**Author:** [@mscroggs](https://bempp.discourse.group/u/mscroggs)\ **Replies:** 0\ **Last updated:** [15 September 2020 16:33 UTC](https://bempp.discourse.group/t/how-to-get-your-question-answered/15 "2020-09-15T16:33:50Z")
:bempp: Welcome Welcome to the Bempp Discourse. Before asking your first question, we recommend that you read this guide. Following the guidance here will make it more likely that you get a useful answer to your questio… [Previous page](https://bempp.discourse.group/latest.md?page=3)