# Cases **URL:** https://pyfr.discourse.group/c/cases/15.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 --- ## [Scaling data on HPC clusters](https://pyfr.discourse.group/t/scaling-data-on-hpc-clusters/1104)
**Author:** [@Frankx9](https://pyfr.discourse.group/u/Frankx9)\ **Replies:** 3\ **Last updated:** [12 June 2024 14:24 UTC](https://pyfr.discourse.group/t/scaling-data-on-hpc-clusters/1104 "2024-06-12T14:24:34Z")
Hello, is there any scaling data for HPC clusters with PyFR which is relatively recent on AMD or NVIDIA vendors? Best --- ## [Entropy filter - point set combination](https://pyfr.discourse.group/t/entropy-filter-point-set-combination/1107)
**Author:** [@Frankx9](https://pyfr.discourse.group/u/Frankx9)\ **Replies:** 7\ **Last updated:** [11 June 2024 23:17 UTC](https://pyfr.discourse.group/t/entropy-filter-point-set-combination/1107 "2024-06-11T23:17:23Z")
Hello, I was trying to use the entropy filtering but I don’t understand why this point set combination is not valid \[solver-interfaces-quad\] flux-pts = gauss-legendre-lobatto \[solver-interfaces-tri\] flux-pts = alpha-… --- ## [Streaks in Turbulence Generation](https://pyfr.discourse.group/t/streaks-in-turbulence-generation/1081)
**Author:** [@Frankx9](https://pyfr.discourse.group/u/Frankx9)\ **Replies:** 10\ **Last updated:** [10 June 2024 13:48 UTC](https://pyfr.discourse.group/t/streaks-in-turbulence-generation/1081 "2024-06-10T13:48:06Z")
Hello, I used the turbulence generator plugin with the geometry and settings already discussed in https://pyfr.discourse.group/t/turbulence-plugin-setting-input-plane/988 and I get the following time-averaged “Numerical… --- ## [Unpaired Faces in Higher Order Mesh](https://pyfr.discourse.group/t/unpaired-faces-in-higher-order-mesh/815)
**Author:** [@Pablo](https://pyfr.discourse.group/u/Pablo)\ **Replies:** 7\ **Last updated:** [10 June 2024 13:20 UTC](https://pyfr.discourse.group/t/unpaired-faces-in-higher-order-mesh/815 "2024-06-10T13:20:52Z")
Hello, I have encountered a problem. When I am trying to export my Pointwise mesh in higher order, I cannot import it to PyFR anymore. I have tried many settings and simplified meshes, but cannot get anything higher ord… --- ## [About specific heat Cp and cpTref](https://pyfr.discourse.group/t/about-specific-heat-cp-and-cptref/1099)
**Author:** [@wgbb](https://pyfr.discourse.group/u/wgbb)\ **Replies:** 2\ **Last updated:** [31 May 2024 01:25 UTC](https://pyfr.discourse.group/t/about-specific-heat-cp-and-cptref/1099 "2024-05-31T01:25:41Z")
Hello, everyone. Can I ask you a question about specific heat Cp? When I want to use isothermal wall surfaces I find that Cp confuses me a bit as I am using dimensionless to flow parameters and I don’t understand how C… --- ## [Entropy Filtering](https://pyfr.discourse.group/t/entropy-filtering/1095)
**Author:** [@Frankx9](https://pyfr.discourse.group/u/Frankx9)\ **Replies:** 14\ **Last updated:** [30 May 2024 11:32 UTC](https://pyfr.discourse.group/t/entropy-filtering/1095 "2024-05-30T11:32:57Z")
Hello, I’ve been running some supersonic cases with the entropy filtering (PyFR = 1.15.0) and my simulation started to divergence, I was able to stabilise it with a very frequent soln-filter but the performance is suffe… --- ## [T106c Low-Pressure Turbine Cascade](https://pyfr.discourse.group/t/t106c-low-pressure-turbine-cascade/1072)
**Author:** [@fei](https://pyfr.discourse.group/u/fei)\ **Replies:** 8\ **Last updated:** [21 May 2024 08:52 UTC](https://pyfr.discourse.group/t/t106c-low-pressure-turbine-cascade/1072 "2024-05-21T08:52:34Z")
Hello, I’m replicating the T106c Low-Pressure Turbine Cascade case in the paper ‘Impact of Number Representation for High-Order Implicit Large-Eddy Simulations’. The mesh I used is in https://how4.cenaero.be/, the order … --- ## [Turbulence plugins, algorithm, parameter](https://pyfr.discourse.group/t/turbulence-plugins-algorithm-parameter/1085)
**Author:** [@wgbb](https://pyfr.discourse.group/u/wgbb)\ **Replies:** 2\ **Last updated:** [14 May 2024 07:53 UTC](https://pyfr.discourse.group/t/turbulence-plugins-algorithm-parameter/1085 "2024-05-14T07:53:12Z")
Hello everyone, I want to try using turbulence plugins to accelerate transition, but I have limited connection to turbulence plugins. Do you have any relevant literature to learn about the algorithm or parameter introd… --- ## [Time-dependent entry function at the entry boundary](https://pyfr.discourse.group/t/time-dependent-entry-function-at-the-entry-boundary/1084)
**Author:** [@wgbb](https://pyfr.discourse.group/u/wgbb)\ **Replies:** 2\ **Last updated:** [6 May 2024 06:20 UTC](https://pyfr.discourse.group/t/time-dependent-entry-function-at-the-entry-boundary/1084 "2024-05-06T06:20:12Z")
Hello everyone, May I ask how to implement a time-dependent entry function at the entry boundary, For example, u=sin (w\*y\*t) \* cos (w \*y\* t) I hope you can offer advice, it’s much appreciated. Regards, Wgbb. --- ## [Reading sampler plugin points from .txt or .csv file](https://pyfr.discourse.group/t/reading-sampler-plugin-points-from-txt-or-csv-file/1074)
**Author:** [@ugyen-wangchuk](https://pyfr.discourse.group/u/ugyen-wangchuk)\ **Replies:** 2\ **Last updated:** [15 April 2024 18:00 UTC](https://pyfr.discourse.group/t/reading-sampler-plugin-points-from-txt-or-csv-file/1074 "2024-04-15T18:00:50Z")
Hi, I am currently running the new PyFRv2.0.0 on a case where I need a higher frequency output and hence using sampler plugin. The sampler plugin work well with amount of points I have defined and generates them to a sin… --- ## [Apply symmetry boundary conditions at the three domain face](https://pyfr.discourse.group/t/apply-symmetry-boundary-conditions-at-the-three-domain-face/1070)
**Author:** [@fei](https://pyfr.discourse.group/u/fei)\ **Replies:** 9\ **Last updated:** [28 March 2024 16:13 UTC](https://pyfr.discourse.group/t/apply-symmetry-boundary-conditions-at-the-three-domain-face/1070 "2024-03-28T16:13:25Z")
Hello, I applied symmetry boundary conditions at the three domain face, but the error appears: ValueError Unpaired periodic boundary in mesh. can’t pyfr set symmetry boundary conditions at the three domain face? --- ## ["3D Triangular Aerofoil" example case](https://pyfr.discourse.group/t/3d-triangular-aerofoil-example-case/1068)
**Author:** [@jung9053](https://pyfr.discourse.group/u/jung9053)\ **Replies:** 1\ **Last updated:** [20 March 2024 18:15 UTC](https://pyfr.discourse.group/t/3d-triangular-aerofoil-example-case/1068 "2024-03-20T18:15:58Z")
Hello, I am trying to follow the tutorials through the provided examples. So far, “2D Incompressible Cylinder Flow” example case working without issue. However, for the “3D Triangular Aerofoil” example case, I got the … --- ## [Boundary values with entropy filter](https://pyfr.discourse.group/t/boundary-values-with-entropy-filter/1050)
**Author:** [@wgbb](https://pyfr.discourse.group/u/wgbb)\ **Replies:** 7\ **Last updated:** [19 March 2024 11:32 UTC](https://pyfr.discourse.group/t/boundary-values-with-entropy-filter/1050 "2024-03-19T11:32:25Z")
Hello everyone, I tried using solver entropy filter to calculate supersonic flow with shock waves, but strange physical peak values appeared at the inlet boundary. I used type = sup-in-fa and type = char-riem-inv me… --- ## [About restarting with a new ini file](https://pyfr.discourse.group/t/about-restarting-with-a-new-ini-file/1035)
**Author:** [@wgbb](https://pyfr.discourse.group/u/wgbb)\ **Replies:** 2\ **Last updated:** [22 February 2024 06:02 UTC](https://pyfr.discourse.group/t/about-restarting-with-a-new-ini-file/1035 "2024-02-22T06:02:04Z")
Hello, everyone. I would like to ask if it is possible to restart a calculation to use a new ini file? For example, I was using 2nd order NS equations and restarted to use 3rd order NS equations. --- ## [What about the continuous tavg plug-in after restart?](https://pyfr.discourse.group/t/what-about-the-continuous-tavg-plug-in-after-restart/995)
**Author:** [@studyhardhardhard](https://pyfr.discourse.group/u/studyhardhardhard)\ **Replies:** 4\ **Last updated:** [15 February 2024 16:46 UTC](https://pyfr.discourse.group/t/what-about-the-continuous-tavg-plug-in-after-restart/995 "2024-02-15T16:46:49Z")
Hello, everyone, I have a question about tavg plug-in and restart functions. I used the tavg plug-in for a long simulation, and the mode used was continuous, but unfortunately, for some reason, the calculation was inter… --- ## [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 = … --- ## [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… --- ## [How to load the initial solution field '\[soln-ics\]' from a .txt file?](https://pyfr.discourse.group/t/how-to-load-the-initial-solution-field-soln-ics-from-a-txt-file/292)
**Author:** [@Kiny\_Wan](https://pyfr.discourse.group/u/Kiny_Wan)\ **Replies:** 5\ **Last updated:** [22 January 2024 08:35 UTC](https://pyfr.discourse.group/t/how-to-load-the-initial-solution-field-soln-ics-from-a-txt-file/292 "2024-01-22T08:35:07Z")
Dear all, I want to validate a benchmark example about vortex pairing \[1\] and it requires to initialize solution with the pressure and density obtained from Poisson equation. I would like to know about how to use the fu… --- ## [Solution filtering](https://pyfr.discourse.group/t/solution-filtering/1012)
**Author:** [@Frankx9](https://pyfr.discourse.group/u/Frankx9)\ **Replies:** 3\ **Last updated:** [11 January 2024 13:13 UTC](https://pyfr.discourse.group/t/solution-filtering/1012 "2024-01-11T13:13:06Z")
Hello, I’m currently running a case where if I use p=1 I can run the solution with a sporadic filtering (e.g 1000 steps) and it is stable while as soon as I increase to p=4 it can only progress in time if I start filter… --- ## [How to define the extent of mesh refinement](https://pyfr.discourse.group/t/how-to-define-the-extent-of-mesh-refinement/682)
**Author:** [@FedericoCipolletta](https://pyfr.discourse.group/u/FedericoCipolletta)\ **Replies:** 7\ **Last updated:** [12 November 2023 18:31 UTC](https://pyfr.discourse.group/t/how-to-define-the-extent-of-mesh-refinement/682 "2023-11-12T18:31:32Z")
Hello everyone, Looking at Figure 1 of Park et al. (2017), or even opening the mesh file from the supplemental material of the same paper with GMSH, it is evident that the mesh is built starting with a particular spacin… --- ## [Turbulence plug-in](https://pyfr.discourse.group/t/turbulence-plug-in/950)
**Author:** [@rubens](https://pyfr.discourse.group/u/rubens)\ **Replies:** 10\ **Last updated:** [2 November 2023 09:09 UTC](https://pyfr.discourse.group/t/turbulence-plug-in/950 "2023-11-02T09:09:48Z")
Good morning everyone, I’m trying to use Peter Vincent’s “turbulence plug-in” branch to add free stream turbulence to the flow. I know that this branch is still in development and hasn’t been pushed yet to the official … --- ## [Input setting for wind simulation](https://pyfr.discourse.group/t/input-setting-for-wind-simulation/962)
**Author:** [@Yubo](https://pyfr.discourse.group/u/Yubo)\ **Replies:** 2\ **Last updated:** [31 October 2023 09:15 UTC](https://pyfr.discourse.group/t/input-setting-for-wind-simulation/962 "2023-10-31T09:15:31Z")
Hi there, Hope you are doing well. Recently, I used PyFR to simulate the aerodynamics of a wind farm. First, I have generated a straightforward structural grid (500m\*300m\*300m) with a cell size of (10m\*10m\*10m). In my … --- ## [How to speed up a compressible T106C simulation](https://pyfr.discourse.group/t/how-to-speed-up-a-compressible-t106c-simulation/776)
**Author:** [@ManuSaiVenkataRatnam](https://pyfr.discourse.group/u/ManuSaiVenkataRatnam)\ **Replies:** 5\ **Last updated:** [27 October 2023 04:08 UTC](https://pyfr.discourse.group/t/how-to-speed-up-a-compressible-t106c-simulation/776 "2023-10-27T04:08:51Z")
Hello Team Pyfr, This is in regards to my thesis work. I have to do T106C test case for my work, but the simulation is taking more time for a warm up of 100 time units of order 1. following are some initial test runs… --- ## [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… --- ## [Vortex/Shock Interaction](https://pyfr.discourse.group/t/vortex-shock-interaction/941)
**Author:** [@Frankx9](https://pyfr.discourse.group/u/Frankx9)\ **Replies:** 0\ **Last updated:** [12 October 2023 16:49 UTC](https://pyfr.discourse.group/t/vortex-shock-interaction/941 "2023-10-12T16:49:14Z")
Hello, is there any test case in pyFR about vortex/shock interaction (.ini files or published studies)? Best regards --- ## [Repartitioning a pyfrm mesh](https://pyfr.discourse.group/t/repartitioning-a-pyfrm-mesh/940)
**Author:** [@luli](https://pyfr.discourse.group/u/luli)\ **Replies:** 4\ **Last updated:** [12 October 2023 07:36 UTC](https://pyfr.discourse.group/t/repartitioning-a-pyfrm-mesh/940 "2023-10-12T07:36:22Z")
In the materials provided in the JCP-2019 paper（Locally adaptive pseudo-time stepping for high-order Flux Reconstruction）, the mesh file pyfrm has been divided into 4 blocks for multi GPU run, but I only have one GPU. Ho… --- ## [Calculating area for lift coefficient](https://pyfr.discourse.group/t/calculating-area-for-lift-coefficient/744)
**Author:** [@Frankx9](https://pyfr.discourse.group/u/Frankx9)\ **Replies:** 7\ **Last updated:** [11 October 2023 17:06 UTC](https://pyfr.discourse.group/t/calculating-area-for-lift-coefficient/744 "2023-10-11T17:06:25Z")
Hi, One question: when I get the fluid forces px,py,pz,vx,vy,vz to compute actual lift I’ve done vy-py, but to compute the lift coefficient for a 3D problem, namely Cl = lift/(0.5 rho v^2 \* Area), is there a simple way… --- ## [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 … --- ## [Free stream turbulence](https://pyfr.discourse.group/t/free-stream-turbulence/934)
**Author:** [@rubens](https://pyfr.discourse.group/u/rubens)\ **Replies:** 2\ **Last updated:** [3 October 2023 13:36 UTC](https://pyfr.discourse.group/t/free-stream-turbulence/934 "2023-10-03T13:36:47Z")
Hello everyone. I’m preparing a .ini file for running a LES simulation with PyFR. Could please someone tell me if there is any way to impose a value for the free stream turbulent intensity and how could I do that? Thank … --- ## [Understanding the tavg function terms](https://pyfr.discourse.group/t/understanding-the-tavg-function-terms/920)
**Author:** [@studyhardhardhard](https://pyfr.discourse.group/u/studyhardhardhard)\ **Replies:** 3\ **Last updated:** [16 September 2023 07:37 UTC](https://pyfr.discourse.group/t/understanding-the-tavg-function-terms/920 "2023-09-16T07:37:30Z")
I’m sorry for my ignorance; I didn’t quite grasp the meaning and physical significance of the ‘fun-avg-upup’ expression. What is ‘uu’? I’m not sure when such parameters were set. What is ‘fun-avg-upup’? I’m guessing ba… [Previous page](https://pyfr.discourse.group/c/cases/15.md) [Next page](https://pyfr.discourse.group/c/cases/15.md?page=2)