# Applications **URL:** https://bempp.discourse.group/c/applications/8.md [Latest](https://bempp.discourse.group/latest.md) · [Categories](https://bempp.discourse.group/categories.md) --- ## [About the Applications category](https://bempp.discourse.group/t/about-the-applications-category/23)
**Author:** [@mscroggs](https://bempp.discourse.group/u/mscroggs)\ **Replies:** 0
Posts in this category are about applications of Bempp to specific problems. --- ## [I am the new guy I am the new guy](https://bempp.discourse.group/t/i-am-the-new-guy-i-am-the-new-guy/357)
**Author:** [@Milla36P497120](https://bempp.discourse.group/u/Milla36P497120)\ **Replies:** 0\ **Last updated:** [7 June 2026 01:52 UTC](https://bempp.discourse.group/t/i-am-the-new-guy-i-am-the-new-guy/357 "2026-06-07T01:52:01Z")
Amazing quite a lot of terrific info. vpn для роутера vless --- ## [Calculating surface currents](https://bempp.discourse.group/t/calculating-surface-currents/352)
**Author:** [@DivConforming](https://bempp.discourse.group/u/DivConforming)\ **Replies:** 0\ **Last updated:** [25 March 2026 03:31 UTC](https://bempp.discourse.group/t/calculating-surface-currents/352 "2026-03-25T03:31:04Z")
Hello, I am new to bempp. For the tutorial “Electromagnetic scattering from flat screens” (link below), is there a way for bempp to output the surface currents (or equivalently the coefficients of the solution vector alo… --- ## [GridFunction: boundary dof evaluation for 2D mesh](https://bempp.discourse.group/t/gridfunction-boundary-dof-evaluation-for-2d-mesh/348)
**Author:** [@EDE](https://bempp.discourse.group/u/EDE)\ **Replies:** 1\ **Last updated:** [1 March 2026 13:48 UTC](https://bempp.discourse.group/t/gridfunction-boundary-dof-evaluation-for-2d-mesh/348 "2026-03-01T13:48:06Z")
Dear Bempp community, I am observing a strange behaviour when using the GridFunction method to project a function onto a 2D mesh. In the example below, I project the same function onto a 2D square mesh and onto a 3D cu… --- ## [Unused U\_cone Variable in BEMPP Loudspeaker Tutorial](https://bempp.discourse.group/t/unused-u-cone-variable-in-bempp-loudspeaker-tutorial/293)
**Author:** [@Kevin](https://bempp.discourse.group/u/Kevin)\ **Replies:** 2\ **Last updated:** [13 January 2026 17:17 UTC](https://bempp.discourse.group/t/unused-u-cone-variable-in-bempp-loudspeaker-tutorial/293 "2026-01-13T17:17:49Z")
Hi everyone, I have a question about the loudspeaker tutorial in the bempp-acoustic-tutorials by mscroggs. In the code, U\_cone is defined as follows: U\_cone = 0.001 # Amplitude of the time-harmonic velocity of the co… --- ## [How to import a mesh from NETGEN](https://bempp.discourse.group/t/how-to-import-a-mesh-from-netgen/350)
**Author:** [@Bastos](https://bempp.discourse.group/u/Bastos)\ **Replies:** 0\ **Last updated:** [2 December 2025 23:22 UTC](https://bempp.discourse.group/t/how-to-import-a-mesh-from-netgen/350 "2025-12-02T23:22:03Z")
Hello to the BEMPP community, I am trying to make BEM calculations for a classic Laplace problem with an electrostatic lens that I meshed with NETGEN (NgSolve). In a previous project, I used BEMPP with a mesh generated … --- ## [The 'nan' issue occurs when solving in Bempp 3.3.4](https://bempp.discourse.group/t/the-nan-issue-occurs-when-solving-in-bempp-3-3-4/346)
**Author:** [@Shelton](https://bempp.discourse.group/u/Shelton)\ **Replies:** 0\ **Last updated:** [6 November 2025 06:08 UTC](https://bempp.discourse.group/t/the-nan-issue-occurs-when-solving-in-bempp-3-3-4/346 "2025-11-06T06:08:14Z")
Hello everyone, When using version Bempp3.3.4 to solve the scattering field of a cube, I encountered ‘nan’ values in the computed scattered electric field on the surface. However, when running the following code multipl… --- ## [Problems of Electromagnetic Scattering Simulation in Mapping RCS](https://bempp.discourse.group/t/problems-of-electromagnetic-scattering-simulation-in-mapping-rcs/343)
**Author:** [@Shelton](https://bempp.discourse.group/u/Shelton)\ **Replies:** 2\ **Last updated:** [28 October 2025 17:39 UTC](https://bempp.discourse.group/t/problems-of-electromagnetic-scattering-simulation-in-mapping-rcs/343 "2025-10-28T17:39:55Z")
Hello everyone, I am using the Method of Moments (MoM) to study the electromagnetic scattering of PEC metal spheres. I found that when the direction of my plane wave propagation is (0,0,-1) and the polarization direction… --- ## [Methods for singularity treatment in Bempp？](https://bempp.discourse.group/t/methods-for-singularity-treatment-in-bempp/345)
**Author:** [@Jake](https://bempp.discourse.group/u/Jake)\ **Replies:** 0\ **Last updated:** [20 October 2025 12:57 UTC](https://bempp.discourse.group/t/methods-for-singularity-treatment-in-bempp/345 "2025-10-20T12:57:26Z")
Dear Bempp users, I am a graduate student specializing in boundary integral equations. While reading the Bempp book, I found that the explanation regarding the treatment of singularities in boundary integral operators i… --- ## [Challenges Encountered When Implementing Relevant Literature Methods Using BEMPP](https://bempp.discourse.group/t/challenges-encountered-when-implementing-relevant-literature-methods-using-bempp/344)
**Author:** [@Duke](https://bempp.discourse.group/u/Duke)\ **Replies:** 0\ **Last updated:** [12 October 2025 05:48 UTC](https://bempp.discourse.group/t/challenges-encountered-when-implementing-relevant-literature-methods-using-bempp/344 "2025-10-12T05:48:04Z")
Hello everyone! I have read most of the relevant articles on BEMPP and noticed that Matthew’s doctoral thesis provides a detailed description of BEMPP. However, when I try to implement the direct EFIE, indirect EFIE, MF… --- ## [Importing a 2D mesh from FEniCSx](https://bempp.discourse.group/t/importing-a-2d-mesh-from-fenicsx/335)
**Author:** [@EDE](https://bempp.discourse.group/u/EDE)\ **Replies:** 1\ **Last updated:** [15 September 2025 12:20 UTC](https://bempp.discourse.group/t/importing-a-2d-mesh-from-fenicsx/335 "2025-09-15T12:20:42Z")
Dear Bempp users, I am trying to implement a vibroacoustics FEM-BEM coupled model using FEniCSx and Bempp. The model is simplified to a box with only one surface vibrates to produce sound into the exterior (the rest is… --- ## [Extracting the interaction matrix (or) the Green's Functions from the MoM solution](https://bempp.discourse.group/t/extracting-the-interaction-matrix-or-the-greens-functions-from-the-mom-solution/339)
**Author:** [@rohi21](https://bempp.discourse.group/u/rohi21)\ **Replies:** 1\ **Last updated:** [25 July 2025 14:32 UTC](https://bempp.discourse.group/t/extracting-the-interaction-matrix-or-the-greens-functions-from-the-mom-solution/339 "2025-07-25T14:32:17Z")
Hello, I’m an undergraduate student trying to further my understanding of MoM and numerical electromagnetics and I would like to manipulate the underlying interaction matrix of structures I’m simulating in bempp to take… --- ## [How to use bempp if the surface has dielectric and perfect conducted parts](https://bempp.discourse.group/t/how-to-use-bempp-if-the-surface-has-dielectric-and-perfect-conducted-parts/53)
**Author:** [@Mix](https://bempp.discourse.group/u/Mix)\ **Replies:** 2\ **Last updated:** [15 May 2025 09:21 UTC](https://bempp.discourse.group/t/how-to-use-bempp-if-the-surface-has-dielectric-and-perfect-conducted-parts/53 "2025-05-15T09:21:08Z")
Hello everyone! I saw the example when bem++ is used for two dielectric spheres. But if I have the perfectly conducted sphere and it has a layer of dielectric, how to solve this in bem++? Could you please help and provi… --- ## [Ground modelling](https://bempp.discourse.group/t/ground-modelling/316)
**Author:** [@Steve](https://bempp.discourse.group/u/Steve)\ **Replies:** 0\ **Last updated:** [16 March 2025 21:54 UTC](https://bempp.discourse.group/t/ground-modelling/316 "2025-03-16T21:54:23Z")
Hi there, I need to model the scattering from structures near a ground seen as a PEC plane. I know that BEMPP only has functionality for free space Green’s functions and that half-space models are not currently support… --- ## [Bistatic RCS generated by dielectric cubes](https://bempp.discourse.group/t/bistatic-rcs-generated-by-dielectric-cubes/297)
**Author:** [@pescapil](https://bempp.discourse.group/u/pescapil)\ **Replies:** 1\ **Last updated:** [4 March 2025 07:52 UTC](https://bempp.discourse.group/t/bistatic-rcs-generated-by-dielectric-cubes/297 "2025-03-04T07:52:54Z")
Hi, I was reproducing the tutorial for dielectric spheres with bempp-cl v0.3.2 but this time I applied it to cubes: sphere0 = bempp.api.shapes.cube(length = 0.4, origin=(-1.0, 0, 0), h=0.2) sphere1 = bempp.api.shapes.cu… --- ## [Invert DL matrix in single step to compute full surface impedance matrix](https://bempp.discourse.group/t/invert-dl-matrix-in-single-step-to-compute-full-surface-impedance-matrix/302)
**Author:** [@hambricacoustics](https://bempp.discourse.group/u/hambricacoustics)\ **Replies:** 4\ **Last updated:** [18 December 2024 12:35 UTC](https://bempp.discourse.group/t/invert-dl-matrix-in-single-step-to-compute-full-surface-impedance-matrix/302 "2024-12-18T12:35:30Z")
Hi, I am exploring the use of BEMPP for computing surface impedance matrices \[Z\] (an NxN matrix of columns of surface pressures induced by individual velocity sources). This requires inverting the DL operator matrix. A… --- ## [Applying Complex Velocity Components in Scalar Function Space for Helmholtz Equation](https://bempp.discourse.group/t/applying-complex-velocity-components-in-scalar-function-space-for-helmholtz-equation/298)
**Author:** [@Kevin](https://bempp.discourse.group/u/Kevin)\ **Replies:** 5\ **Last updated:** [25 November 2024 21:13 UTC](https://bempp.discourse.group/t/applying-complex-velocity-components-in-scalar-function-space-for-helmholtz-equation/298 "2024-11-25T21:13:51Z")
Hello Bempp Community, I am working on a problem involving the calculation of sound pressure using the Helmholtz equation and have complex Normal velocity components (X, Y, Z) for each node in my mesh. According to the … --- ## [Using BEMPP to Calculate Far-Field Sound Pressure Around a Hollow Cube with Imported Surface Velocities](https://bempp.discourse.group/t/using-bempp-to-calculate-far-field-sound-pressure-around-a-hollow-cube-with-imported-surface-velocities/289)
**Author:** [@Kevin](https://bempp.discourse.group/u/Kevin)\ **Replies:** 14\ **Last updated:** [24 November 2024 20:06 UTC](https://bempp.discourse.group/t/using-bempp-to-calculate-far-field-sound-pressure-around-a-hollow-cube-with-imported-surface-velocities/289 "2024-11-24T20:06:04Z")
Hello Everone, I’m working on a student project where I need to use BEMPP to calculate the sound pressure in the far-field around a hollow cube. The cube is excited by a steady-state load, and I’ve conducted a mode-base… --- ## [Slow convergence of GMRES with FMM assembler](https://bempp.discourse.group/t/slow-convergence-of-gmres-with-fmm-assembler/286)
**Author:** [@Sid](https://bempp.discourse.group/u/Sid)\ **Replies:** 3\ **Last updated:** [16 November 2024 13:03 UTC](https://bempp.discourse.group/t/slow-convergence-of-gmres-with-fmm-assembler/286 "2024-11-16T13:03:02Z")
Dear Bempp Community, Thank you for this great package. I am simulating sound radiation from a vibrating structure with around 120,000 elements using the Numba-only Docker image. To accelerate the computation and avoid… --- ## [Requesting help: Issues Installing exafmm-t for BEMPP Acoustic Simulations](https://bempp.discourse.group/t/requesting-help-issues-installing-exafmm-t-for-bempp-acoustic-simulations/294)
**Author:** [@Kevin](https://bempp.discourse.group/u/Kevin)\ **Replies:** 0\ **Last updated:** [11 November 2024 14:53 UTC](https://bempp.discourse.group/t/requesting-help-issues-installing-exafmm-t-for-bempp-acoustic-simulations/294 "2024-11-11T14:53:58Z")
Hello Everyone, I’m currently working on an acoustic simulation using BEMPP, where I’m dealing with a mesh that contains 110,000 nodes. Initially, I attempted to use a dense assembler with the following command: double… --- ## [Velocity field with phase](https://bempp.discourse.group/t/velocity-field-with-phase/245)
**Author:** [@soundintubes](https://bempp.discourse.group/u/soundintubes)\ **Replies:** 3\ **Last updated:** [7 October 2024 10:24 UTC](https://bempp.discourse.group/t/velocity-field-with-phase/245 "2024-10-07T10:24:40Z")
Hello, apologies in advance but I am an engineer not a mathematician(!) I’m working on an acoustics problem of a cube with one face radiating. I based it on this tutorial: https://nbviewer.org/github/mscroggs/bempp-aco… --- ## [Issues encountered with grid output in the 0.3.1 version](https://bempp.discourse.group/t/issues-encountered-with-grid-output-in-the-0-3-1-version/284)
**Author:** [@S.L](https://bempp.discourse.group/u/S.L)\ **Replies:** 2\ **Last updated:** [24 September 2024 03:35 UTC](https://bempp.discourse.group/t/issues-encountered-with-grid-output-in-the-0-3-1-version/284 "2024-09-24T03:35:29Z")
Hello! I am delighted to have discovered bempp as an invaluable aid for my computations. But, when using 0.3.1, upon completing calculations and attempting to export the grid, an error is encountered: Running this oper… --- ## [Integrating function of surface normals](https://bempp.discourse.group/t/integrating-function-of-surface-normals/280)
**Author:** [@Arne](https://bempp.discourse.group/u/Arne)\ **Replies:** 1\ **Last updated:** [11 September 2024 15:27 UTC](https://bempp.discourse.group/t/integrating-function-of-surface-normals/280 "2024-09-11T15:27:06Z")
I am trying to compute various quantities from the scattering amplitude, in the setting of acoustic scattering from an obstacle \\Omega with Dirichlet boundary conditions. One way to compute the scattering amplitude (cf.… --- ## [Logging/debugging core](https://bempp.discourse.group/t/logging-debugging-core/276)
**Author:** [@soundintubes](https://bempp.discourse.group/u/soundintubes)\ **Replies:** 0\ **Last updated:** [31 July 2024 17:53 UTC](https://bempp.discourse.group/t/logging-debugging-core/276 "2024-07-31T17:53:21Z")
I’ve found bempp.api.enable\_console\_logging, which gives some useful output from GMRES. But what I’m really looking for is a more verbose debug log, so that when I run something like: helmholtz.double\_layer(… I can se… --- ## [Burton-Miller formulation is not correct](https://bempp.discourse.group/t/burton-miller-formulation-is-not-correct/254)
**Author:** [@hellojxt](https://bempp.discourse.group/u/hellojxt)\ **Replies:** 1\ **Last updated:** [8 April 2024 09:23 UTC](https://bempp.discourse.group/t/burton-miller-formulation-is-not-correct/254 "2024-04-08T09:23:04Z")
I found that the Burton-Miller formulation yields higher errors compared to the standard boundary element equation in my test case. Can someone explain why this might be happening? Reproduction code: import bempp.api i… --- ## [Ways to define domains in \*.msh files](https://bempp.discourse.group/t/ways-to-define-domains-in-msh-files/223)
**Author:** [@TKaF](https://bempp.discourse.group/u/TKaF)\ **Replies:** 5\ **Last updated:** [27 January 2024 13:10 UTC](https://bempp.discourse.group/t/ways-to-define-domains-in-msh-files/223 "2024-01-27T13:10:34Z")
Dear community, i am interested to simulate acoustical radiation from a horn. I can model the horn (based on formulas / in a parametrical manner) and the membrane independently and covert it form point clouds to a mesh… --- ## [Far-field scattering pattern for FEM-BEM coupling](https://bempp.discourse.group/t/far-field-scattering-pattern-for-fem-bem-coupling/225)
**Author:** [@Hassan](https://bempp.discourse.group/u/Hassan)\ **Replies:** 2\ **Last updated:** [13 January 2024 08:34 UTC](https://bempp.discourse.group/t/far-field-scattering-pattern-for-fem-bem-coupling/225 "2024-01-13T08:34:14Z")
Hi everyone, I want to use FEniCS together with Bempp to compute the far-field scattering pattern from a unit sphere. I modified " Simple FEM-BEM coupling for the Helmholtz equation with FEniCS" for a unite sphere and … --- ## [Support for finite surface conductivity with Maxwell boundary conditions?](https://bempp.discourse.group/t/support-for-finite-surface-conductivity-with-maxwell-boundary-conditions/213)
**Author:** [@jere](https://bempp.discourse.group/u/jere)\ **Replies:** 0\ **Last updated:** [4 October 2023 17:00 UTC](https://bempp.discourse.group/t/support-for-finite-surface-conductivity-with-maxwell-boundary-conditions/213 "2023-10-04T17:00:29Z")
Hello - I’m looking into the use of the BEMPP tool for planar (PCB) antenna applications with the Maxwell (electromagnetic) boundary conditions that include multiple feed ports. I’ve found the examples that demonstrate t… --- ## [Electromagnetic simulation of a dielectric cube backed by a PEC ground](https://bempp.discourse.group/t/electromagnetic-simulation-of-a-dielectric-cube-backed-by-a-pec-ground/195)
**Author:** [@qiank10](https://bempp.discourse.group/u/qiank10)\ **Replies:** 1\ **Last updated:** [8 June 2023 03:18 UTC](https://bempp.discourse.group/t/electromagnetic-simulation-of-a-dielectric-cube-backed-by-a-pec-ground/195 "2023-06-08T03:18:58Z")
Hello, I am new to BEMPP and want to use it to simulate the scattering field of a dielectric cube backed by a PEC ground. The structure is illustrated in the figure below. Following the two tutorial examples (flat sc… --- ## [RBC space on concentric spheres](https://bempp.discourse.group/t/rbc-space-on-concentric-spheres/188)
**Author:** [@Chayma](https://bempp.discourse.group/u/Chayma)\ **Replies:** 1\ **Last updated:** [3 May 2023 10:36 UTC](https://bempp.discourse.group/t/rbc-space-on-concentric-spheres/188 "2023-05-03T10:36:48Z")
Hi, I’m using BEMPP to solve the Maxwell problem on two concentric spheres. sphere0 = bempp.api.shapes.sphere(r=0.5, origin=(0, 0, 0), h=.2) sphere1=bempp.api.shapes.sphere(r=1, origin=(0,0,0), h=.2) grid = bempp.api.g… [Next page](https://bempp.discourse.group/c/applications/8.md?page=1)