# General **URL:** https://pyfr.discourse.group/c/general/9.md?page=1 [Latest](https://pyfr.discourse.group/latest.md) · [Categories](https://pyfr.discourse.group/categories.md) · [Tags](https://pyfr.discourse.group/tags.md) **Page:** 2 --- ## [Set mu(T) in integrate plugin](https://pyfr.discourse.group/t/set-mu-t-in-integrate-plugin/1116)
**Author:** [@fei](https://pyfr.discourse.group/u/fei)\ **Replies:** 1\ **Last updated:** [26 June 2024 16:10 UTC](https://pyfr.discourse.group/t/set-mu-t-in-integrate-plugin/1116 "2024-06-26T16:10:09Z")
Hello, I want to set mu(T) in integrate plugin, and the mu(T) is solved by Sutherland law. Is it possible? With best regards --- ## [Can pyFR be used to solve moving boundary problems?](https://pyfr.discourse.group/t/can-pyfr-be-used-to-solve-moving-boundary-problems/1113)
**Author:** [@studyhardhardhard](https://pyfr.discourse.group/u/studyhardhardhard)\ **Replies:** 2\ **Last updated:** [22 April 2025 10:26 UTC](https://pyfr.discourse.group/t/can-pyfr-be-used-to-solve-moving-boundary-problems/1113 "2025-04-22T10:26:08Z")
In CFD simulations, moving boundary problems often arise due to the boundary movement causing changes in the flow field over time, which requires the mesh to change over time as well. The most common method for this is t… --- ## [Ascent installation](https://pyfr.discourse.group/t/ascent-installation/1100)
**Author:** [@Frankx9](https://pyfr.discourse.group/u/Frankx9)\ **Replies:** 1\ **Last updated:** [30 May 2024 08:11 UTC](https://pyfr.discourse.group/t/ascent-installation/1100 "2024-05-30T08:11:24Z")
Hello, I know that this is not an ascent support group but would you be able to share how you were able to install ascent from source it with its dependencies on a hpc environment and make pyfr recognize it? Best --- ## [What is the "stage" meaning in rk34 or rk45?](https://pyfr.discourse.group/t/what-is-the-stage-meaning-in-rk34-or-rk45/1098)
**Author:** [@studyhardhardhard](https://pyfr.discourse.group/u/studyhardhardhard)\ **Replies:** 2\ **Last updated:** [29 May 2024 13:26 UTC](https://pyfr.discourse.group/t/what-is-the-stage-meaning-in-rk34-or-rk45/1098 "2024-05-29T13:26:46Z")
Hello, everyone! I am very keen to understand how the time-integration scheme works. Although my foundation in numerical analysis is quite weak, I still want to try my best to comprehend it, despite facing difficulties. … --- ## [Memory on CUDA GPU](https://pyfr.discourse.group/t/memory-on-cuda-gpu/1093)
**Author:** [@wgbb](https://pyfr.discourse.group/u/wgbb)\ **Replies:** 1\ **Last updated:** [22 May 2024 07:50 UTC](https://pyfr.discourse.group/t/memory-on-cuda-gpu/1093 "2024-05-22T07:50:43Z")
Hello, everybody. I’d like to ask you about a memory problem during cuda calculations, I’m experiencing a lack of video memory. To give a brief description, when I do a calculation with a 3D mesh of 7 million with orde… --- ## [Time-averaging the sum of viscous and pressure forces](https://pyfr.discourse.group/t/time-averaging-the-sum-of-viscous-and-pressure-forces/1088)
**Author:** [@fei](https://pyfr.discourse.group/u/fei)\ **Replies:** 2\ **Last updated:** [15 May 2024 13:03 UTC](https://pyfr.discourse.group/t/time-averaging-the-sum-of-viscous-and-pressure-forces/1088 "2024-05-15T13:03:20Z")
Hello, I used fluidforce-plugin to get forces, how to get time-averaging the sum of viscous and pressure forces? I integrate the forces, but the results seems wrong. Could someone give me some advice? --- ## [Entropy filtering algorithms, e-func](https://pyfr.discourse.group/t/entropy-filtering-algorithms-e-func/1087)
**Author:** [@wgbb](https://pyfr.discourse.group/u/wgbb)\ **Replies:** 0\ **Last updated:** [14 May 2024 08:09 UTC](https://pyfr.discourse.group/t/entropy-filtering-algorithms-e-func/1087 "2024-05-14T08:09:19Z")
Hello everyone, I understand that entropy filtering algorithms work well for excitation capture, see these two papers(10.1016/j.jcp.2022.111501), but I don’t understand what is the difference between e-func = numerical… --- ## [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… --- ## [Radom function in the ini file](https://pyfr.discourse.group/t/radom-function-in-the-ini-file/1071)
**Author:** [@fei](https://pyfr.discourse.group/u/fei)\ **Replies:** 4\ **Last updated:** [21 May 2024 11:01 UTC](https://pyfr.discourse.group/t/radom-function-in-the-ini-file/1071 "2024-05-21T11:01:49Z")
Hello, everyone. I want to set the solenoidal velocity field as the initial value, but I know the radom function which makes up the velocity field is not included ini file. How do I achieve this? Thanks a lot. --- ## [Mesh partition error](https://pyfr.discourse.group/t/mesh-partition-error/1061)
**Author:** [@fei](https://pyfr.discourse.group/u/fei)\ **Replies:** 7\ **Last updated:** [16 March 2024 14:10 UTC](https://pyfr.discourse.group/t/mesh-partition-error/1061 "2024-03-16T14:10:51Z")
Hello, I began to run the pyfr 2.0, versions up to 2.0 run normally. When I did the mesh partition by pyfr partition 30 a.pyfrm ., it comes error. Traceback (most recent call last): File “/home/pyfr-2.0/bin/pyfr”, lin… --- ## [Intel sapphire-rapids processors](https://pyfr.discourse.group/t/intel-sapphire-rapids-processors/1052)
**Author:** [@subutai](https://pyfr.discourse.group/u/subutai)\ **Replies:** 1\ **Last updated:** [8 March 2024 16:33 UTC](https://pyfr.discourse.group/t/intel-sapphire-rapids-processors/1052 "2024-03-08T16:33:01Z")
Dear PyFR community, Has anyone had experience with the brand new intel sapphire rapids processors (a.k.a. Intel(R) Xeon Platinum 8468) using the oneapi compilers (compiler command: icx)? Especially using the new PyFR v… --- ## [Subgrid wall model](https://pyfr.discourse.group/t/subgrid-wall-model/1008)
**Author:** [@Zhenyang](https://pyfr.discourse.group/u/Zhenyang)\ **Replies:** 4\ **Last updated:** [31 December 2023 18:25 UTC](https://pyfr.discourse.group/t/subgrid-wall-model/1008 "2023-12-31T18:25:36Z")
Hi, I wonder if anyone in the community has implemented wall modelled LES in the PyFR. This question may be asked for many times but curious about the recent updates and wonder if this is on the current road map of PyFR… --- ## [Transfer the information of adjacent cell to the current cell](https://pyfr.discourse.group/t/transfer-the-information-of-adjacent-cell-to-the-current-cell/1006)
**Author:** [@fei](https://pyfr.discourse.group/u/fei)\ **Replies:** 22\ **Last updated:** [21 January 2024 14:54 UTC](https://pyfr.discourse.group/t/transfer-the-information-of-adjacent-cell-to-the-current-cell/1006 "2024-01-21T14:54:16Z")
Hello everyone, I want to get the information of the adjacont element, such as rho, u… I know it’s not a simple operation, because pyfr is unstructured solver. But it has been bothering me a long time. In my opinipn, I … --- ## [Synthetic turbulence](https://pyfr.discourse.group/t/synthetic-turbulence/973)
**Author:** [@Amirshau](https://pyfr.discourse.group/u/Amirshau)\ **Replies:** 5\ **Last updated:** [7 November 2023 20:38 UTC](https://pyfr.discourse.group/t/synthetic-turbulence/973 "2023-11-07T20:38:20Z")
Hello everyone, are there any news regarding synthetic turbulence generation as an official pyfr feature and that works with v1.15? or with a new version of PyFR? Best regards, Amir --- ## [Question about BDF2](https://pyfr.discourse.group/t/question-about-bdf2/949)
**Author:** [@ndmao001](https://pyfr.discourse.group/u/ndmao001)\ **Replies:** 1\ **Last updated:** [20 October 2023 10:14 UTC](https://pyfr.discourse.group/t/question-about-bdf2/949 "2023-10-20T10:14:40Z")
Dear PyFR developers, recently I read some papers about researching incompressible flow with PyFR, almost all researchers consider BDF2 as the physical time discrete format, which is no longer available in the latest ve… --- ## [Result of last simulation as the infow condition of next simulation](https://pyfr.discourse.group/t/result-of-last-simulation-as-the-infow-condition-of-next-simulation/939)
**Author:** [@fei](https://pyfr.discourse.group/u/fei)\ **Replies:** 1\ **Last updated:** [11 October 2023 12:02 UTC](https://pyfr.discourse.group/t/result-of-last-simulation-as-the-infow-condition-of-next-simulation/939 "2023-10-11T12:02:18Z")
Hello, everyone Firstly, the result of 2d case is obtained by pyfr, then use this result as the inlet boundary condition of three dimentional simulation, is it possible in pyfr? --- ## [Applying turbulence generation patch file](https://pyfr.discourse.group/t/applying-turbulence-generation-patch-file/935)
**Author:** [@fei](https://pyfr.discourse.group/u/fei)\ **Replies:** 3\ **Last updated:** [6 October 2023 15:43 UTC](https://pyfr.discourse.group/t/applying-turbulence-generation-patch-file/935 "2023-10-06T15:43:52Z")
Hello, everyone I add the patch file in pyfr, and run “patch \< stg.diff”, but it appears errors. Is anyone experiencing the same issue? --- ## [A deeper understanding of the solver-time integrator](https://pyfr.discourse.group/t/a-deeper-understanding-of-the-solver-time-integrator/931)
**Author:** [@studyhardhardhard](https://pyfr.discourse.group/u/studyhardhardhard)\ **Replies:** 3\ **Last updated:** [25 September 2023 12:22 UTC](https://pyfr.discourse.group/t/a-deeper-understanding-of-the-solver-time-integrator/931 "2023-09-25T12:22:06Z")
Hello, everyone! I think a common issue that many people may encounter during the computation process is the “RuntimeError: Minimum sized time step rejected.” My boundary conditions are set to “char-riem-inv,” and the … --- ## [For VTU files that are missing object surface information](https://pyfr.discourse.group/t/for-vtu-files-that-are-missing-object-surface-information/929)
**Author:** [@studyhardhardhard](https://pyfr.discourse.group/u/studyhardhardhard)\ **Replies:** 3\ **Last updated:** [25 September 2023 09:55 UTC](https://pyfr.discourse.group/t/for-vtu-files-that-are-missing-object-surface-information/929 "2023-09-25T09:55:44Z")
Hello, everyone! Using PyFR is highly efficient, and I truly enjoy working with it. However, there’s a persistent concern I have: its output file format, VTU, isn’t quite user-friendly for my needs. Specifically, while… --- ## [Redirecting progress to file](https://pyfr.discourse.group/t/redirecting-progress-to-file/928)
**Author:** [@studyhardhardhard](https://pyfr.discourse.group/u/studyhardhardhard)\ **Replies:** 6\ **Last updated:** [21 September 2023 17:13 UTC](https://pyfr.discourse.group/t/redirecting-progress-to-file/928 "2023-09-21T17:13:46Z")
I have a minor issue: I’m currently running PyFR in the background and saving the output to a file. When PyFR is running in the foreground, it prints progress updates about every second, reporting both elapsed and estim… --- ## [Regarding synthetic/turbulent inlet conditions](https://pyfr.discourse.group/t/regarding-synthetic-turbulent-inlet-conditions/901)
**Author:** [@DanSTO](https://pyfr.discourse.group/u/DanSTO)\ **Replies:** 1\ **Last updated:** [23 August 2023 22:55 UTC](https://pyfr.discourse.group/t/regarding-synthetic-turbulent-inlet-conditions/901 "2023-08-23T22:55:57Z")
Hello, is there any way to add synthetic turbulent flow at the inlet. I see that at one point PyFR had this feature. But in the current branch I don’t see the turbulencegenerator plugin --- ## [Tecplot 360 now supports high order element VTU files](https://pyfr.discourse.group/t/tecplot-360-now-supports-high-order-element-vtu-files/895)
**Author:** [@wsfowler](https://pyfr.discourse.group/u/wsfowler)\ **Replies:** 1\ **Last updated:** [11 August 2023 08:01 UTC](https://pyfr.discourse.group/t/tecplot-360-now-supports-high-order-element-vtu-files/895 "2023-08-11T08:01:29Z")
Tecplot 360 2023 R1 has just been released and includes support for VTU files with high order elements, which makes Tecplot 360 compatible with (some) PyFR output. In this version of Tecplot 360 we support P2-P4 Lagrania… --- ## [Nektar++ comparison](https://pyfr.discourse.group/t/nektar-comparison/826)
**Author:** [@syavash](https://pyfr.discourse.group/u/syavash)\ **Replies:** 8\ **Last updated:** [12 June 2023 07:00 UTC](https://pyfr.discourse.group/t/nektar-comparison/826 "2023-06-12T07:00:06Z")
Hi Zhenyang I wonder if you can share the comparison between pyFR and Nektar++ (and Nek5000 maybe). I am very interested as I am evaluating which code I use as a high-order CFD tool. Kind regards syavash --- ## [Some Basics on FR and High-Order Mesh Generation](https://pyfr.discourse.group/t/some-basics-on-fr-and-high-order-mesh-generation/823)
**Author:** [@syavash](https://pyfr.discourse.group/u/syavash)\ **Replies:** 3\ **Last updated:** [8 June 2023 20:07 UTC](https://pyfr.discourse.group/t/some-basics-on-fr-and-high-order-mesh-generation/823 "2023-06-08T20:07:47Z")
Dear All, I am new to FR and I have two questions: 1-What is Anti-Aliasing in the high-order CFD framework? I come from FV community and this matter somewhat puzzles me! 2-I know high-order meshing in case of the curv… --- ## [DoFs and solution points](https://pyfr.discourse.group/t/dofs-and-solution-points/742)
**Author:** [@YoonSuKyung](https://pyfr.discourse.group/u/YoonSuKyung)\ **Replies:** 1\ **Last updated:** [31 January 2023 00:27 UTC](https://pyfr.discourse.group/t/dofs-and-solution-points/742 "2023-01-31T00:27:17Z")
Hi, I am curious about the concept of solution point. What is difference between # of DoFs and # of solution points? When i checked DoFs using h5ls, DoF value is 83,185,500. However, i got 16,637,100 # of points in pa… --- ## [Comparison of artificial compressibility methods](https://pyfr.discourse.group/t/comparison-of-artificial-compressibility-methods/689)
**Author:** [@WillT](https://pyfr.discourse.group/u/WillT)\ **Replies:** 0\ **Last updated:** [2 September 2022 20:14 UTC](https://pyfr.discourse.group/t/comparison-of-artificial-compressibility-methods/689 "2022-09-02T20:14:53Z")
I thought people might be interested in a recent paper from the PyFR team where we compared some artificial compressibility approaches. These are a set of techniques for solving the incompressible Navier–Stokes equation. … --- ## [Questions about getting started with pyfr](https://pyfr.discourse.group/t/questions-about-getting-started-with-pyfr/688)
**Author:** [@cfd.user.newbie](https://pyfr.discourse.group/u/cfd.user.newbie)\ **Replies:** 2\ **Last updated:** [2 September 2022 19:31 UTC](https://pyfr.discourse.group/t/questions-about-getting-started-with-pyfr/688 "2022-09-02T19:31:00Z")
Hello, I haven’t started using PyFR yet, but I think I have several questions. The code is expected to be used by experts who are familiar with the theoretical framework of the solver. Is it expected at some point in… --- ## [Alternative boundary conditions](https://pyfr.discourse.group/t/alternative-boundary-conditions/675)
**Author:** [@fei](https://pyfr.discourse.group/u/fei)\ **Replies:** 5\ **Last updated:** [21 August 2022 19:47 UTC](https://pyfr.discourse.group/t/alternative-boundary-conditions/675 "2022-08-21T19:47:06Z")
When I apply the boundary conditions, I want to change the values on the wall which constructed the slip boundary condition. I need to write another function “BaseAdvectionBCInters”, but I don’t understand how to calcula… --- ## [Is there anyone use pyfr to simluate arterial blood flow?](https://pyfr.discourse.group/t/is-there-anyone-use-pyfr-to-simluate-arterial-blood-flow/674)
**Author:** [@luli](https://pyfr.discourse.group/u/luli)\ **Replies:** 1\ **Last updated:** [17 August 2022 18:16 UTC](https://pyfr.discourse.group/t/is-there-anyone-use-pyfr-to-simluate-arterial-blood-flow/674 "2022-08-17T18:16:53Z")
In many papers, PyFR is applied in aerospace field, I wonder if this program can be used in medical field such as simulating the arterial blood flow. --- ## [How PyFR handle shock capture problem?](https://pyfr.discourse.group/t/how-pyfr-handle-shock-capture-problem/664)
**Author:** [@luli](https://pyfr.discourse.group/u/luli)\ **Replies:** 2\ **Last updated:** [5 August 2022 10:28 UTC](https://pyfr.discourse.group/t/how-pyfr-handle-shock-capture-problem/664 "2022-08-05T10:28:33Z")
When applying the higher-order scheme, the capture of shock is a difficult problem. How does pyfr deal with it ? I saw “artificial viscosity” option in user guide , is there any limiter can I choose ? [Previous page](https://pyfr.discourse.group/c/general/9.md) [Next page](https://pyfr.discourse.group/c/general/9.md?page=2)