# Top **URL:** https://pyfr.discourse.group/top.md [Latest](https://pyfr.discourse.group/latest.md) · [Categories](https://pyfr.discourse.group/categories.md) · [Tags](https://pyfr.discourse.group/tags.md) --- ## [TGV Performance Numbers](https://pyfr.discourse.group/t/tgv-performance-numbers/407)
**Author:** [@WillT](https://pyfr.discourse.group/u/WillT)\ **Replies:** 31\ **Last updated:** [5 July 2022 10:18 UTC](https://pyfr.discourse.group/t/tgv-performance-numbers/407 "2022-07-05T10:18:47Z")
I was recently asked how Ampere GPUs compare to CPU, I have previously given some performance numbers, but decided to make more of a benchmark case for comparison. I ran a 40^3 hex mesh with p=3, which gives about 4.1 m… --- ## [High-Order VTK Output Mode](https://pyfr.discourse.group/t/high-order-vtk-output-mode/353)
**Author:** [@GonzaloS](https://pyfr.discourse.group/u/GonzaloS)\ **Replies:** 10\ **Last updated:** [15 October 2024 11:07 UTC](https://pyfr.discourse.group/t/high-order-vtk-output-mode/353 "2024-10-15T11:07:39Z")
Hi everyone, With the recent merge of PR 195, PyFR is now capable of exporting solution and grid data in vtu format using high-order VTK cells, referred to as Lagrange cells in VTK \[1\]. This allows VTK (and therefore P… --- ## [HYDU\_create\_process, execvp error on file pyfr (No such file or directory)](https://pyfr.discourse.group/t/hydu-create-process-execvp-error-on-file-pyfr-no-such-file-or-directory/703)
**Author:** [@ManuSaiVenkataRatnam](https://pyfr.discourse.group/u/ManuSaiVenkataRatnam)\ **Replies:** 21\ **Last updated:** [10 October 2022 12:16 UTC](https://pyfr.discourse.group/t/hydu-create-process-execvp-error-on-file-pyfr-no-such-file-or-directory/703 "2022-10-10T12:16:12Z")
Hello Team PyFr, I am currently trying to use PyFR in my college HPC. Got following error, and I am unable to resolve this. ...... HYDU\_create\_process (../../utils/launch/launch.c:827): execvp error on file pyfr (No su… --- ## [Questions on the TGV case](https://pyfr.discourse.group/t/questions-on-the-tgv-case/556)
**Author:** [@luli](https://pyfr.discourse.group/u/luli)\ **Replies:** 34\ **Last updated:** [22 March 2022 09:57 UTC](https://pyfr.discourse.group/t/questions-on-the-tgv-case/556 "2022-03-22T09:57:08Z")
This post was moved here from here: TGV Performance Numbers In the ini file provided, what’s the meaning of parameter gimmik-max-nnz = 512? --- ## [Errors on mesh with pyramid elements](https://pyfr.discourse.group/t/errors-on-mesh-with-pyramid-elements/501)
**Author:** [@Zhenyang](https://pyfr.discourse.group/u/Zhenyang)\ **Replies:** 38\ **Last updated:** [20 May 2024 18:07 UTC](https://pyfr.discourse.group/t/errors-on-mesh-with-pyramid-elements/501 "2024-05-20T18:07:09Z")
Hi, I am using Pointwise to generate fully 3D mesh. The mesh can be divided into two blocks, one is boundary layer mesh which is extruded from 2D, the other one, which in order to avoid the high aspect ratio in the farf… --- ## [Failed to run example cases using openmp as backend](https://pyfr.discourse.group/t/failed-to-run-example-cases-using-openmp-as-backend/649)
**Author:** [@hwtang](https://pyfr.discourse.group/u/hwtang)\ **Replies:** 28\ **Last updated:** [30 July 2022 09:31 UTC](https://pyfr.discourse.group/t/failed-to-run-example-cases-using-openmp-as-backend/649 "2022-07-30T09:31:39Z")
Dear all, I am trying to learn PyFR to do some simulations. I have installed PyFR and successfully run the three examples following the guide. However, I failed try to run the example case using openmp as backend. How … --- ## [PyFR boundary conditions for turbomachinery](https://pyfr.discourse.group/t/pyfr-boundary-conditions-for-turbomachinery/961)
**Author:** [@Frankx9](https://pyfr.discourse.group/u/Frankx9)\ **Replies:** 53\ **Last updated:** [28 January 2024 14:22 UTC](https://pyfr.discourse.group/t/pyfr-boundary-conditions-for-turbomachinery/961 "2024-01-28T14:22:52Z")
Hello, I’m running a simulation in pyFR but I noticed that the results are not correct due to the fact that the outlet boundary condition (char-riem-inv) is not respected. Here is my .ini file regarding outlet u2 = 20… --- ## [Problem with CUDA when installing PyFR on Windows10](https://pyfr.discourse.group/t/problem-with-cuda-when-installing-pyfr-on-windows10/454)
**Author:** [@Winxingtf](https://pyfr.discourse.group/u/Winxingtf)\ **Replies:** 19\ **Last updated:** [28 August 2021 13:03 UTC](https://pyfr.discourse.group/t/problem-with-cuda-when-installing-pyfr-on-windows10/454 "2021-08-28T13:03:57Z")
Dear all, I was trying to install PyFR.1.12.2 on a new workstation, equipped with AMD Ryzen Threadripper 3970X 32-Core Processor and Nvidia GeForce RTX 2070 SUPER running Windows 10. I could have made it successfully on… --- ## [KeyError on 3D case running with WSL Ubuntu openMP](https://pyfr.discourse.group/t/keyerror-on-3d-case-running-with-wsl-ubuntu-openmp/404)
**Author:** [@jack](https://pyfr.discourse.group/u/jack)\ **Replies:** 28\ **Last updated:** [19 September 2021 14:25 UTC](https://pyfr.discourse.group/t/keyerror-on-3d-case-running-with-wsl-ubuntu-openmp/404 "2021-09-19T14:25:06Z")
Hi All, I am running PyFr on Windows WSL Ubuntu with openMP. The 2D example cases work well. However, when I prepare my own 3D case and tried with the following command: mpiexec -n 2 pyfr run -b openmp -p building\_3d.p… --- ## [Incompressible BCs not fully enforced](https://pyfr.discourse.group/t/incompressible-bcs-not-fully-enforced/786)
**Author:** [@Yujif1Aero](https://pyfr.discourse.group/u/Yujif1Aero)\ **Replies:** 41\ **Last updated:** [25 April 2023 14:21 UTC](https://pyfr.discourse.group/t/incompressible-bcs-not-fully-enforced/786 "2023-04-25T14:21:24Z")
Hi all, I was able to make simple mesh myself. However, it’s result is not right… Could you teach me how to fix it? What I want to do is that the external fluid calculation around 3D cude. I attach the image fig and … --- ## [PyFR simulating NACA0021 airfoil in deep stall](https://pyfr.discourse.group/t/pyfr-simulating-naca0021-airfoil-in-deep-stall/438)
**Author:** [@FedericoCipolletta](https://pyfr.discourse.group/u/FedericoCipolletta)\ **Replies:** 21\ **Last updated:** [18 July 2022 09:00 UTC](https://pyfr.discourse.group/t/pyfr-simulating-naca0021-airfoil-in-deep-stall/438 "2022-07-18T09:00:25Z")
Hello everyone, I am trying to repeat the NACA0021 test of Witherden, Jameson (2020) (https://arc.aiaa.org/doi/abs/10.2514/1.J058434), Sec D. Basically, starting with order = 1 without antialiasing with tend = 100.0 and… --- ## [GPU parallelization error, ranks not equal to gpu number](https://pyfr.discourse.group/t/gpu-parallelization-error-ranks-not-equal-to-gpu-number/661)
**Author:** [@YoonSuKyung](https://pyfr.discourse.group/u/YoonSuKyung)\ **Replies:** 22\ **Last updated:** [20 September 2023 14:35 UTC](https://pyfr.discourse.group/t/gpu-parallelization-error-ranks-not-equal-to-gpu-number/661 "2023-09-20T14:35:16Z")
When I run 2d euler vortex case, i got this message. Last month, I asked same question. That day I thought this message was because I have 1 gpu. Now, i install one more gpu (2 \* rtx 3090 ti gpus) It still shows th… --- ## [Problem in repeating sd7003 sim with PyFR v 1.12.1.1](https://pyfr.discourse.group/t/problem-in-repeating-sd7003-sim-with-pyfr-v-1-12-1-1/480)
**Author:** [@FedericoCipolletta](https://pyfr.discourse.group/u/FedericoCipolletta)\ **Replies:** 22\ **Last updated:** [20 November 2021 17:25 UTC](https://pyfr.discourse.group/t/problem-in-repeating-sd7003-sim-with-pyfr-v-1-12-1-1/480 "2021-11-20T17:25:10Z")
Hello everyone, I would like to repeat the simulation of the sd7003 airfoil (see https://doi.org/10.1016/j.jcp.2016.12.049) with PyFR 1.12.1, in order to produce a nice movie of the Q-criterion. I tried using this vers… --- ## [Mesh resolution, order, and curved boundaries](https://pyfr.discourse.group/t/mesh-resolution-order-and-curved-boundaries/455)
**Author:** [@Winxingtf](https://pyfr.discourse.group/u/Winxingtf)\ **Replies:** 12\ **Last updated:** [17 August 2021 03:14 UTC](https://pyfr.discourse.group/t/mesh-resolution-order-and-curved-boundaries/455 "2021-08-17T03:14:14Z")
Exactly, I’m attempting to try a higher order like 2 or 3 with a more robust machine. Since we’re talking about the order and mesh resolution, I have two questions that have been bothering me for a long time about the is… --- ## [Couette flow in lierature](https://pyfr.discourse.group/t/couette-flow-in-lierature/591)
**Author:** [@fei](https://pyfr.discourse.group/u/fei)\ **Replies:** 38\ **Last updated:** [16 May 2022 12:37 UTC](https://pyfr.discourse.group/t/couette-flow-in-lierature/591 "2022-05-16T12:37:22Z")
Hello everyone, I want to reproduce the results of couette case in the paper, PyFR: An open source framework for solving advection-diffusion type problems on streaming architectures using the flux reconstruction approac… --- ## [NACA 0021 Airfoil in Deep Stall - Minimum sized time step rejected](https://pyfr.discourse.group/t/naca-0021-airfoil-in-deep-stall-minimum-sized-time-step-rejected/295)
**Author:** [@Anh\_Vu\_Nguyen](https://pyfr.discourse.group/u/Anh_Vu_Nguyen)\ **Replies:** 12\ **Last updated:** [29 April 2021 15:57 UTC](https://pyfr.discourse.group/t/naca-0021-airfoil-in-deep-stall-minimum-sized-time-step-rejected/295 "2021-04-29T15:57:27Z")
Hello PyFR Community, I’m currently trying to recreate the simulations from the paper of Park, Vincent and Witherden (2017) on a NACA0021 Aerofoil in deep stall. I am using the provided mesh and configuration file for t… --- ## [Memory on CUDA GPU backend](https://pyfr.discourse.group/t/memory-on-cuda-gpu-backend/488)
**Author:** [@Zhenyang](https://pyfr.discourse.group/u/Zhenyang)\ **Replies:** 14\ **Last updated:** [18 November 2021 00:07 UTC](https://pyfr.discourse.group/t/memory-on-cuda-gpu-backend/488 "2021-11-18T00:07:59Z")
Hi, I am testing a big 3D jet case on new cluster (with NVIDIA A100 GPU, I think it is 40 Gb version). Since it has 8 GPUs and 2 CPUs in one node, I should use round-robin for device-id option, right? On each node, it h… --- ## [High order curved mesh visualization](https://pyfr.discourse.group/t/high-order-curved-mesh-visualization/453)
**Author:** [@subutai](https://pyfr.discourse.group/u/subutai)\ **Replies:** 10\ **Last updated:** [16 August 2021 12:12 UTC](https://pyfr.discourse.group/t/high-order-curved-mesh-visualization/453 "2021-08-16T12:12:47Z")
Hi all, I have been trying to fit high-order curved faces to geometries. I use PointwiseV18.3R2 for this, because I can use it, and don’t want to bother with learning Gmsh at the moment. The problem is, I don’t know if … --- ## [Non-dimensionalized sutherland law](https://pyfr.discourse.group/t/non-dimensionalized-sutherland-law/695)
**Author:** [@YoonSuKyung](https://pyfr.discourse.group/u/YoonSuKyung)\ **Replies:** 12\ **Last updated:** [2 June 2023 06:31 UTC](https://pyfr.discourse.group/t/non-dimensionalized-sutherland-law/695 "2023-06-02T06:31:56Z")
Hi, i’m Sukyung Yoon I want to compare the compressible and incompressible flow field for the same Reynolds number condition. Question1\> I want to simulate the Reynolds number 15,000 conditions. Can it be said that t… --- ## [Minimum sized time step rejected 2d pipe flow](https://pyfr.discourse.group/t/minimum-sized-time-step-rejected-2d-pipe-flow/720)
**Author:** [@alinala](https://pyfr.discourse.group/u/alinala)\ **Replies:** 24\ **Last updated:** [19 January 2023 14:42 UTC](https://pyfr.discourse.group/t/minimum-sized-time-step-rejected-2d-pipe-flow/720 "2023-01-19T14:42:23Z")
Hi all, I am trying to simulate a really simple case of 2D flow in-between two parallel plates. But keep getting ‘minimum sized time step rejected’. Tried different meshes, tried reducing time step, tried with and witho… --- ## [NACA0012：Oscillation on the wall](https://pyfr.discourse.group/t/naca0012-oscillation-on-the-wall/570)
**Author:** [@jian](https://pyfr.discourse.group/u/jian)\ **Replies:** 25\ **Last updated:** [17 March 2022 00:27 UTC](https://pyfr.discourse.group/t/naca0012-oscillation-on-the-wall/570 "2022-03-17T00:27:35Z")
Hello, I am simulating airfoil in Ma=0.8. But oscillation occurs on the wall, the grid and density contour are shown below. Could someone know anything about this problem? \[backend\] precision = double rank-allocator = … --- ## [Low Reynolds, Transonic, High AoA condition](https://pyfr.discourse.group/t/low-reynolds-transonic-high-aoa-condition/840)
**Author:** [@YoonSuKyung](https://pyfr.discourse.group/u/YoonSuKyung)\ **Replies:** 22\ **Last updated:** [19 June 2023 07:49 UTC](https://pyfr.discourse.group/t/low-reynolds-transonic-high-aoa-condition/840 "2023-06-19T07:49:17Z")
Hi, i’m Sukyung I’m using a compressible solver. In my case, ILES is conducted on conditions with Re = 5,000~30,000 & M=0.1~0.9 & AoA= -15~+20(deg) to build aerodynamic database. I will perform the Euler calculation a… --- ## [Simulating T106A Low Pressure Turbine](https://pyfr.discourse.group/t/simulating-t106a-low-pressure-turbine/495)
**Author:** [@FedericoCipolletta](https://pyfr.discourse.group/u/FedericoCipolletta)\ **Replies:** 9\ **Last updated:** [11 October 2023 12:03 UTC](https://pyfr.discourse.group/t/simulating-t106a-low-pressure-turbine/495 "2023-10-11T12:03:50Z")
Hello Everyone, I am trying to run a simulation of the T106A Low-Pressure Turbine blade with PyFR version 1.12.2. I found the geometry model of the T106A Low-Pressure Turbine blade at http://www-g.eng.cam.ac.uk/whittle… --- ## [Flow-visualisation: spurious discontinuities between elements](https://pyfr.discourse.group/t/flow-visualisation-spurious-discontinuities-between-elements/428)
**Author:** [@Zach-Davis](https://pyfr.discourse.group/u/Zach-Davis)\ **Replies:** 14\ **Last updated:** [21 July 2021 07:22 UTC](https://pyfr.discourse.group/t/flow-visualisation-spurious-discontinuities-between-elements/428 "2021-07-21T07:22:28Z")
If I’m plotting something like magnitude of velocity contours in either Tecplot or Paraview, everything looks as it should. However, once I calculate something like magnitude of vorticity from the velocity field, the co… --- ## [Error: CUDANoDevice on WSL](https://pyfr.discourse.group/t/error-cudanodevice-on-wsl/772)
**Author:** [@Yujif1Aero](https://pyfr.discourse.group/u/Yujif1Aero)\ **Replies:** 19\ **Last updated:** [26 September 2023 13:38 UTC](https://pyfr.discourse.group/t/error-cudanodevice-on-wsl/772 "2023-09-26T13:38:40Z")
Hello, I installed PyFR following this page ,ubuntu (Installation — Documentation) I am tyring test cases on wrb site(Examples — Documentation). I could make one partation, however I have gotten error mesages. Could yo… --- ## [Example Datasets/configs for PyFR?](https://pyfr.discourse.group/t/example-datasets-configs-for-pyfr/57)
**Author:** [@Pablo\_Restrepo\_Henao](https://pyfr.discourse.group/u/Pablo_Restrepo_Henao)\ **Replies:** 14\ **Last updated:** [11 March 2015 18:29 UTC](https://pyfr.discourse.group/t/example-datasets-configs-for-pyfr/57 "2015-03-11T18:29:58Z")
Hello everyone, I am Pablo, and I will be participating in the Student Cluster Competition in the team EAFIT/PURDUE in ISC15. One of the applications we have to run for the competition is Pyfr, so i was wondering if yo… --- ## [Turbulence plugin, setting input plane](https://pyfr.discourse.group/t/turbulence-plugin-setting-input-plane/988)
**Author:** [@Frankx9](https://pyfr.discourse.group/u/Frankx9)\ **Replies:** 23\ **Last updated:** [31 January 2024 15:23 UTC](https://pyfr.discourse.group/t/turbulence-plugin-setting-input-plane/988 "2024-01-31T15:23:09Z")
Hello, I’m trying to understand how to correctly use the turbulence plugin. I want to generate eddies in my inlet plane with is in the yz plane. I have set \[solver-plugin-turbulence\] turbulence-intensity = 1 sigma = … --- ## [Add a new Riemann solver with different flux methods](https://pyfr.discourse.group/t/add-a-new-riemann-solver-with-different-flux-methods/524)
**Author:** [@jian](https://pyfr.discourse.group/u/jian)\ **Replies:** 21\ **Last updated:** [18 January 2022 13:28 UTC](https://pyfr.discourse.group/t/add-a-new-riemann-solver-with-different-flux-methods/524 "2022-01-18T13:28:19Z")
Hello everyone, I want to add a new Riemann solver, with flux solutions are different with PyFr on the left and right sides of the interface. such as the below picture, in my understanding, ‘fl’, ‘fr’ come from inviscid\_… --- ## [Partitions vs. MPI ranks in large run.](https://pyfr.discourse.group/t/partitions-vs-mpi-ranks-in-large-run/374)
**Author:** [@EloisaBentivegna](https://pyfr.discourse.group/u/EloisaBentivegna)\ **Replies:** 15\ **Last updated:** [20 May 2021 11:06 UTC](https://pyfr.discourse.group/t/partitions-vs-mpi-ranks-in-large-run/374 "2021-05-20T11:06:21Z")
Hello, I’ve been running PyFR without problems on a mesh with around 25M elements on up to ~2k nodes (~12k GPUs). A further experiment on 4096 nodes, however, leads to the following error: 1: 0: Traceback (most recen… --- ## [PyFR 1.13.0: CUDAOSError](https://pyfr.discourse.group/t/pyfr-1-13-0-cudaoserror/555)
**Author:** [@Zhenyang](https://pyfr.discourse.group/u/Zhenyang)\ **Replies:** 13\ **Last updated:** [20 February 2022 11:07 UTC](https://pyfr.discourse.group/t/pyfr-1-13-0-cudaoserror/555 "2022-02-20T11:07:39Z")
Hi, I have a error message as I run my case: Traceback (most recent call last): File "/home/x\_zhyua/.conda/envs/pyfr13\_env/bin/pyfr", line 33, in \ sys.exit(load\_entry\_point('pyfr==1.13.0', 'console\_script… --- ## [OpenMP xsmm, kernel mul has no providers](https://pyfr.discourse.group/t/openmp-xsmm-kernel-mul-has-no-providers/511)
**Author:** [@mlohry](https://pyfr.discourse.group/u/mlohry)\ **Replies:** 11\ **Last updated:** [13 April 2022 20:44 UTC](https://pyfr.discourse.group/t/openmp-xsmm-kernel-mul-has-no-providers/511 "2022-04-13T20:44:56Z")
Similar to one of the issues described here, running PyFR-1.12.3 release tag: When attempting to run with the OpenMP backend I’m hitting the same “KeyError: ‘Kernel “mul” has no providers’”. I have set the specified e… --- ## [Gradients without writing to disk](https://pyfr.discourse.group/t/gradients-without-writing-to-disk/436)
**Author:** [@tsas](https://pyfr.discourse.group/u/tsas)\ **Replies:** 13\ **Last updated:** [21 October 2022 07:47 UTC](https://pyfr.discourse.group/t/gradients-without-writing-to-disk/436 "2022-10-21T07:47:01Z")
Is there a way to access the gradients of a PyFR simulation from within Python, similar to integ.soln, without the need to write the solution file to disk and using pyfr export -g? I intend to run a large number of simu… --- ## [Getting either NaNs or extremely slow convergence](https://pyfr.discourse.group/t/getting-either-nans-or-extremely-slow-convergence/617)
**Author:** [@Fellshock](https://pyfr.discourse.group/u/Fellshock)\ **Replies:** 16\ **Last updated:** [15 June 2022 13:20 UTC](https://pyfr.discourse.group/t/getting-either-nans-or-extremely-slow-convergence/617 "2022-06-15T13:20:34Z")
I’m trying to do LESes of flows past a large number (~100) of different bluff bodies using the ac-navier-stokes solver at around Re=400. My BCs are periodic in the z-direction (the bluff bodies are extruded along the z-d… --- ## [Installing PyFR with spack](https://pyfr.discourse.group/t/installing-pyfr-with-spack/546)
**Author:** [@Fab](https://pyfr.discourse.group/u/Fab)\ **Replies:** 10\ **Last updated:** [15 February 2022 20:34 UTC](https://pyfr.discourse.group/t/installing-pyfr-with-spack/546 "2022-02-15T20:34:53Z")
Hi @mlaufer, a bit late… did you install pyfr with spack as well? I did not see that this is available in the spack packages. Best Regards Fab --- ## [Laminar flow over a sphere case: "Minimum sized time step rejected"](https://pyfr.discourse.group/t/laminar-flow-over-a-sphere-case-minimum-sized-time-step-rejected/885)
**Author:** [@studyhardhardhard](https://pyfr.discourse.group/u/studyhardhardhard)\ **Replies:** 10\ **Last updated:** [20 October 2023 10:25 UTC](https://pyfr.discourse.group/t/laminar-flow-over-a-sphere-case-minimum-sized-time-step-rejected/885 "2023-10-20T10:25:15Z")
Hello everyone, As a newcomer to pyFR, I am currently trying to compute a Laminar flow over a sphere case to learn and understand pyFR. In this case, the hemisphere is set with a no-slp-adia-wall boundary condition, th… --- ## [High order mesh generation in 2D with pointwise](https://pyfr.discourse.group/t/high-order-mesh-generation-in-2d-with-pointwise/869)
**Author:** [@joseph](https://pyfr.discourse.group/u/joseph)\ **Replies:** 9\ **Last updated:** [7 July 2023 23:07 UTC](https://pyfr.discourse.group/t/high-order-mesh-generation-in-2d-with-pointwise/869 "2023-07-07T23:07:34Z")
Hi, In 3d pointwise makes a block and workes with q1 to q4 with no problem. I tried 18.4 and 18.6 also 2022.2 version with Elevate stuff. In 2d pointwise makes high order mesh?, is it available? For 2d I could use gms… --- ## [Riemann problem in 2D](https://pyfr.discourse.group/t/riemann-problem-in-2d/536)
**Author:** [@jian](https://pyfr.discourse.group/u/jian)\ **Replies:** 14\ **Last updated:** [9 February 2022 16:07 UTC](https://pyfr.discourse.group/t/riemann-problem-in-2d/536 "2022-02-09T16:07:30Z")
Hello everyone, I am simulating Riemann problem in 2D, I met two questons: I’m using Gmsh to generate the grid in this format, this is different from grid in examples, and it doesn’t work. I set the initial value in t… --- ## [NaNs for variation of incompressible cylinder](https://pyfr.discourse.group/t/nans-for-variation-of-incompressible-cylinder/440)
**Author:** [@Fellshock](https://pyfr.discourse.group/u/Fellshock)\ **Replies:** 14\ **Last updated:** [21 July 2021 14:11 UTC](https://pyfr.discourse.group/t/nans-for-variation-of-incompressible-cylinder/440 "2021-07-21T14:11:36Z")
I’ve been trying to run a custom cylinder example, based partly on the .ini file for the incompressible cylinder example on the PyFR website. It seems like the solver gets NaNs within a fixed amount of timesteps - e.g. a… --- ## [MPI collect wait times informations](https://pyfr.discourse.group/t/mpi-collect-wait-times-informations/838)
**Author:** [@Frankx9](https://pyfr.discourse.group/u/Frankx9)\ **Replies:** 24\ **Last updated:** [14 June 2023 14:38 UTC](https://pyfr.discourse.group/t/mpi-collect-wait-times-informations/838 "2023-06-14T14:38:51Z")
Hi, I was trying to detect load imbalances but when using collect wait times in the backed section, my solution file only has these informations: \[data\] fields = rho,rhou,rhov,rhow,E prefix = soln \[backend\] rank-alloc… --- ## [Enstrophy of Taylor-Green vortex](https://pyfr.discourse.group/t/enstrophy-of-taylor-green-vortex/1077)
**Author:** [@fei](https://pyfr.discourse.group/u/fei)\ **Replies:** 21\ **Last updated:** [28 April 2024 13:19 UTC](https://pyfr.discourse.group/t/enstrophy-of-taylor-green-vortex/1077 "2024-04-28T13:19:44Z")
Hello, I want reproduce the result of the Taylor-Green vortex, and I used the ini file attached below. But the enstrophy is very small,such as 1e-7 magnitude, part of the intergate file shows as follows. I used 0.5int-en… --- ## [Output euler vortex super accuracy](https://pyfr.discourse.group/t/output-euler-vortex-super-accuracy/529)
**Author:** [@jian](https://pyfr.discourse.group/u/jian)\ **Replies:** 16\ **Last updated:** [1 March 2022 15:36 UTC](https://pyfr.discourse.group/t/output-euler-vortex-super-accuracy/529 "2022-03-01T15:36:23Z")
Hello everyone, I want to assess accuracy by comparing with the analytical solutions in euler vortex case, such as the operator in this paper. (see PyFR: An open source framework for solving advection–diffusion type pr… --- ## [Calculating cell averages in Mako macros](https://pyfr.discourse.group/t/calculating-cell-averages-in-mako-macros/710)
**Author:** [@fei](https://pyfr.discourse.group/u/fei)\ **Replies:** 16\ **Last updated:** [31 October 2022 16:47 UTC](https://pyfr.discourse.group/t/calculating-cell-averages-in-mako-macros/710 "2022-10-31T16:47:15Z")
Hi, Assuming cell i, I want to compute cell average of solution value u\_{i}, u\_{i+1} in macro environment. How to implement this? And are there any examples I can refer to? Second, Is it possible to install two differe… --- ## [Questions relating to the 2-D Incompressible Cylinder case](https://pyfr.discourse.group/t/questions-relating-to-the-2-d-incompressible-cylinder-case/147)
**Author:** [@Zach\_Davis1](https://pyfr.discourse.group/u/Zach_Davis1)\ **Replies:** 16\ **Last updated:** [27 March 2017 14:52 UTC](https://pyfr.discourse.group/t/questions-relating-to-the-2-d-incompressible-cylinder-case/147 "2017-03-27T14:52:28Z")
Peter & Freddie, I believe the mesh export issue from Pointwise using the PyFR exporter has been resolved in PyFR 1.6. I still seem to have issues running using the OpenCL backend which persistently complains about an i… --- ## [restarting from partitioned mesh fails](https://pyfr.discourse.group/t/restarting-from-partitioned-mesh-fails/1327)
**Author:** [@subutai](https://pyfr.discourse.group/u/subutai)\ **Replies:** 27\ **Last updated:** [3 February 2026 13:03 UTC](https://pyfr.discourse.group/t/restarting-from-partitioned-mesh-fails/1327 "2026-02-03T13:03:38Z")
Nature of bug I am trying the newest development version because i am interested in some of the new features. I ran my simulation case on A100 cards (classical external flow, airfoil section), starting from using p0 to… --- ## [What is the build option requirement of CGNS for pyfr 1.5.0?](https://pyfr.discourse.group/t/what-is-the-build-option-requirement-of-cgns-for-pyfr-1-5-0/132)
**Author:** [@CatDog](https://pyfr.discourse.group/u/CatDog)\ **Replies:** 16\ **Last updated:** [11 January 2021 22:24 UTC](https://pyfr.discourse.group/t/what-is-the-build-option-requirement-of-cgns-for-pyfr-1-5-0/132 "2021-01-11T22:24:05Z")
I am running into some confusions about the CGNS lib. The CGNS 3.3.0 is too much newer than my CentOS 6. So I have to compile it with hdf5 (and szip, I am not sure if it is necessary). However, after that, when I tried … --- ## [Qustion about extracting the lift moment of a thin flat](https://pyfr.discourse.group/t/qustion-about-extracting-the-lift-moment-of-a-thin-flat/450)
**Author:** [@Winxingtf](https://pyfr.discourse.group/u/Winxingtf)\ **Replies:** 14\ **Last updated:** [15 August 2021 07:21 UTC](https://pyfr.discourse.group/t/qustion-about-extracting-the-lift-moment-of-a-thin-flat/450 "2021-08-15T07:21:22Z")
Dear all, Recently, I want to test a thin flat plate problem both in 2d and 3d in PyFR v1.12.1. The parameters I need are the lift force Fl and lift moment M. The plugin \[soln-plugin-fluidforce-name\] is helpful, but se… --- ## [METIS 5.2.0 partition error](https://pyfr.discourse.group/t/metis-5-2-0-partition-error/986)
**Author:** [@zj519](https://pyfr.discourse.group/u/zj519)\ **Replies:** 9\ **Last updated:** [27 March 2024 11:39 UTC](https://pyfr.discourse.group/t/metis-5-2-0-partition-error/986 "2024-03-27T11:39:13Z")
Hi community, To run the 2d test cases on PyFR with turbulence plugin (develop branch), using METIS 5.2.0 as partitioner, I get the following errors: test case: 2d-euler-vortex $ pyfr partition 2 \*.pyfrm \*.pyfrs ./ T… --- ## [What's the relationship between Gimmik and cublas?](https://pyfr.discourse.group/t/whats-the-relationship-between-gimmik-and-cublas/550)
**Author:** [@luli](https://pyfr.discourse.group/u/luli)\ **Replies:** 10\ **Last updated:** [9 May 2022 07:48 UTC](https://pyfr.discourse.group/t/whats-the-relationship-between-gimmik-and-cublas/550 "2022-05-09T07:48:30Z")
I read the paper Redirecting and, it seems that GIMMIk is better than cublas? Does the new version of pyfr still need to use the library cublas or not? --- ## [Implicit time stepping scheme setup/config for compressible flows](https://pyfr.discourse.group/t/implicit-time-stepping-scheme-setup-config-for-compressible-flows/723)
**Author:** [@Zhenyang](https://pyfr.discourse.group/u/Zhenyang)\ **Replies:** 9\ **Last updated:** [29 December 2022 21:13 UTC](https://pyfr.discourse.group/t/implicit-time-stepping-scheme-setup-config-for-compressible-flows/723 "2022-12-29T21:13:48Z")
Hi, Recently I noticed the using implicit time stepping can boost simulation a lot. I checked several post about this in the forum. I tried recommended setups by Niki but it seems my solver kept blowing up after a while… --- ## [Wall shear stress value (skin friction)](https://pyfr.discourse.group/t/wall-shear-stress-value-skin-friction/680)
**Author:** [@YoonSuKyung](https://pyfr.discourse.group/u/YoonSuKyung)\ **Replies:** 9\ **Last updated:** [11 October 2023 13:23 UTC](https://pyfr.discourse.group/t/wall-shear-stress-value-skin-friction/680 "2023-10-11T13:23:10Z")
I want to check the separation and attachment points of the airfoil so i need x-shear stress, y-shear stress, z-shear stress, etc. on the wall as if I get a Pressure field. Given that vx and vy can be obtained from the … [Next page](https://pyfr.discourse.group/top.md?page=1&per_page=50)