# Just Starting **URL:** https://pyfr.discourse.group/c/just-starting/7.md [Latest](https://pyfr.discourse.group/latest.md) · [Categories](https://pyfr.discourse.group/categories.md) · [Tags](https://pyfr.discourse.group/tags.md) --- ## [About the Just Starting](https://pyfr.discourse.group/t/about-the-just-starting/16)
**Author:** [@WillT](https://pyfr.discourse.group/u/WillT)\ **Replies:** 0\ **Last updated:** [9 October 2020 00:09 UTC](https://pyfr.discourse.group/t/about-the-just-starting/16 "2020-10-09T00:09:38Z")
If you are new to PyFR and have questions this should be your first port of call. We understand that getting started with PyFR can be quite daunting, this is a place for people to ask questions related to getting up and… --- ## [Postprocessing .vtu files seems to only have discontinuous fields](https://pyfr.discourse.group/t/postprocessing-vtu-files-seems-to-only-have-discontinuous-fields/1346)
**Author:** [@Bob](https://pyfr.discourse.group/u/Bob)\ **Replies:** 1\ **Last updated:** [6 March 2026 12:51 UTC](https://pyfr.discourse.group/t/postprocessing-vtu-files-seems-to-only-have-discontinuous-fields/1346 "2026-03-06T12:51:25Z")
Hello :), I have been trying to use PyFR .vtu outputs for post-processing, but after looking into the files more closely it seems that the cells are exported as disconnected elements. For my application this is problema… --- ## [Modifying mesh of 2d demo case](https://pyfr.discourse.group/t/modifying-mesh-of-2d-demo-case/1321)
**Author:** [@second\_moment](https://pyfr.discourse.group/u/second_moment)\ **Replies:** 10\ **Last updated:** [7 December 2025 00:37 UTC](https://pyfr.discourse.group/t/modifying-mesh-of-2d-demo-case/1321 "2025-12-07T00:37:22Z")
I have been getting started by trying to modify the 2d-inc-cylinder tutorial to be a flow around a rhombus instead of around a round cylinder. To do so I produced a new mesh using Gmsh but otherwise ran the same configur… --- ## [How to monitor residuals and export results to Tecplot?](https://pyfr.discourse.group/t/how-to-monitor-residuals-and-export-results-to-tecplot/1308)
**Author:** [@lucci](https://pyfr.discourse.group/u/lucci)\ **Replies:** 4\ **Last updated:** [23 October 2025 00:46 UTC](https://pyfr.discourse.group/t/how-to-monitor-residuals-and-export-results-to-tecplot/1308 "2025-10-23T00:46:58Z")
Hello everyone, I’m a new user of PyFR and currently learning to run some 2D test cases. I have two beginner-level questions: How can I output or monitor the residuals during the simulation? I would like to see how t… --- ## [Error When Importing Mesh: np.int64(7)](https://pyfr.discourse.group/t/error-when-importing-mesh-np-int64-7/1265)
**Author:** [@hyume](https://pyfr.discourse.group/u/hyume)\ **Replies:** 0\ **Last updated:** [21 May 2025 07:51 UTC](https://pyfr.discourse.group/t/error-when-importing-mesh-np-int64-7/1265 "2025-05-21T07:51:08Z")
Hello, I am running a forward-facing step simulation and encountered an error when trying to import the mesh. pyfr import fine.msh mesh.pyfrm Traceback (most recent call last): File "/home/user01/test\_fine/PyFR/venv… --- ## [Error partitioning the mesh](https://pyfr.discourse.group/t/error-partitioning-the-mesh/1261)
**Author:** [@arun-s-p](https://pyfr.discourse.group/u/arun-s-p)\ **Replies:** 5\ **Last updated:** [15 May 2025 11:32 UTC](https://pyfr.discourse.group/t/error-partitioning-the-mesh/1261 "2025-05-15T11:32:34Z")
I am trying to partition the 2D Euler vortex test case with Metis 5.2.1, by pyfr partition add -p metis euler-vortex.pyfrm 2 . I get the error: ValueError: Invalid partitioning name Has the command for partitioning ch… --- ## [Blasius velocity profile at inlet](https://pyfr.discourse.group/t/blasius-velocity-profile-at-inlet/1253)
**Author:** [@iagyonwu](https://pyfr.discourse.group/u/iagyonwu)\ **Replies:** 5\ **Last updated:** [30 April 2025 14:10 UTC](https://pyfr.discourse.group/t/blasius-velocity-profile-at-inlet/1253 "2025-04-30T14:10:38Z")
Hello, I want to simulate a boundary layer flow over a flat plate. The inlet is a Blasius profile, which can be calculated for the specific Re\_x needed. I tried to load the data from an external file for the .ini f… --- ## [Partition error with scotch](https://pyfr.discourse.group/t/partition-error-with-scotch/1237)
**Author:** [@iagyonwu](https://pyfr.discourse.group/u/iagyonwu)\ **Replies:** 1\ **Last updated:** [25 March 2025 09:47 UTC](https://pyfr.discourse.group/t/partition-error-with-scotch/1237 "2025-03-25T09:47:15Z")
Hello, I am trying the provided tutorial on HPC (HLRS hunter: HLRS High Performance Computing Center Stuttgart: HPE Cray EX4000 (Hunter)). In a interactive session, I was able to tun the tutorial with one GPU with the… --- ## [Install pyfr on HPC with AMD gpu](https://pyfr.discourse.group/t/install-pyfr-on-hpc-with-amd-gpu/1234)
**Author:** [@iagyonwu](https://pyfr.discourse.group/u/iagyonwu)\ **Replies:** 2\ **Last updated:** [18 March 2025 13:32 UTC](https://pyfr.discourse.group/t/install-pyfr-on-hpc-with-amd-gpu/1234 "2025-03-18T13:32:07Z")
Hello everyone, I am new to PyFR, and tried to intall it on HPC (hlrs hunter: HPE Hunter Hardware and Architecture - HLRS Platforms). The HPC uses AMD mi300a processor. I followed the instruction on the Installation p… --- ## [Mesh adaptation](https://pyfr.discourse.group/t/mesh-adaptation/1206)
**Author:** [@mschouler](https://pyfr.discourse.group/u/mschouler)\ **Replies:** 7\ **Last updated:** [17 January 2025 15:29 UTC](https://pyfr.discourse.group/t/mesh-adaptation/1206 "2025-01-17T15:29:51Z")
Hello, I am currently trying to couple pyfr with the mesh adaptation software MAdLib which performs anisotropic adaptation with tri. / tet. of arbitrary order. So far I have been able to adapt the mesh externally with … --- ## [Getting started making my own meshes](https://pyfr.discourse.group/t/getting-started-making-my-own-meshes/1138)
**Author:** [@pyfr\_starting\_man](https://pyfr.discourse.group/u/pyfr_starting_man)\ **Replies:** 1\ **Last updated:** [18 July 2024 02:36 UTC](https://pyfr.discourse.group/t/getting-started-making-my-own-meshes/1138 "2024-07-18T02:36:08Z")
Hi, I have been studying PyFR for my Master’s for a few months now, and I feel pretty confident in my ability to set up test cases and understanding how PyFR works at a basic/intermediate level. My next step is setting u… --- ## [Video / Tutorial Series for Using PyFR](https://pyfr.discourse.group/t/video-tutorial-series-for-using-pyfr/1111)
**Author:** [@pyfr\_starting\_man](https://pyfr.discourse.group/u/pyfr_starting_man)\ **Replies:** 1\ **Last updated:** [22 June 2024 08:12 UTC](https://pyfr.discourse.group/t/video-tutorial-series-for-using-pyfr/1111 "2024-06-22T08:12:49Z")
Hi, I am relatively new to CFD and am studying how to use PyFR for CFD applications. I have extensively read through the PyFR documentation and I am still having loads of issues setting up my .ini files. The documentatio… --- ## [Scotch cannot find gzclose](https://pyfr.discourse.group/t/scotch-cannot-find-gzclose/1096)
**Author:** [@pyfr\_starting\_man](https://pyfr.discourse.group/u/pyfr_starting_man)\ **Replies:** 5\ **Last updated:** [23 May 2024 15:18 UTC](https://pyfr.discourse.group/t/scotch-cannot-find-gzclose/1096 "2024-05-23T15:18:37Z")
Hi, I just downloaded PyFR 2.0.1 and am trying to setup SCOTCH to partition my meshes. I am continuously running across an error for both the test case given: python -c “from ctypes import CDLL; CDLL(‘${PYFR\_SCOTCH\_LIBRA… --- ## [Solver-interfaces and solver-elements](https://pyfr.discourse.group/t/solver-interfaces-and-solver-elements/1092)
**Author:** [@pyfr\_starting\_man](https://pyfr.discourse.group/u/pyfr_starting_man)\ **Replies:** 1\ **Last updated:** [22 May 2024 12:28 UTC](https://pyfr.discourse.group/t/solver-interfaces-and-solver-elements/1092 "2024-05-22T12:28:31Z")
Hi, I am just getting started with PyFR for my master’s thesis. I am a bit confused when it comes to solver-interfaces and solver-elements settings in the configuration (.ini) file. I am trying to get PyFR to run on an e… --- ## [Running PyFR v2.0.0 in Parallel](https://pyfr.discourse.group/t/running-pyfr-v2-0-0-in-parallel/1066)
**Author:** [@fdw](https://pyfr.discourse.group/u/fdw)\ **Replies:** 0\ **Last updated:** [18 March 2024 20:46 UTC](https://pyfr.discourse.group/t/running-pyfr-v2-0-0-in-parallel/1066 "2024-03-18T20:46:22Z")
Running PyFR v2.0.0 requires several extra dependencies to be correctly configured. Namely mpi4py and a partitioner such as METIS or SCOTCH. mpi4py Depending on your platform there is a reasonable chance that mpi4py is… --- ## [About residual convergence](https://pyfr.discourse.group/t/about-residual-convergence/1044)
**Author:** [@wgbb](https://pyfr.discourse.group/u/wgbb)\ **Replies:** 3\ **Last updated:** [8 March 2024 15:30 UTC](https://pyfr.discourse.group/t/about-residual-convergence/1044 "2024-03-08T15:30:31Z")
Hello everyone, I have a confusing question about residual convergence. When I use the first-order NS equation to calculate, the residual can reach 0.01. However, when I increase the order to 2nd and 3rd, the residual c… --- ## [About the issue of solver-artificial-viscosity](https://pyfr.discourse.group/t/about-the-issue-of-solver-artificial-viscosity/1040)
**Author:** [@wgbb](https://pyfr.discourse.group/u/wgbb)\ **Replies:** 4\ **Last updated:** [8 March 2024 10:27 UTC](https://pyfr.discourse.group/t/about-the-issue-of-solver-artificial-viscosity/1040 "2024-03-08T10:27:07Z")
Hello everyone, I would like to ask about the issue of solver-artificial-viscosity, solver-artificial-viscosity max-artvisc = 0.01 s0 = 0.01 kappa = 5.0 ; 10.0 For example, I saw a brief description of the specific me… --- ## [Saving conserved variables in .vtu files](https://pyfr.discourse.group/t/saving-conserved-variables-in-vtu-files/1029)
**Author:** [@annarenshaw1](https://pyfr.discourse.group/u/annarenshaw1)\ **Replies:** 1\ **Last updated:** [13 February 2024 13:52 UTC](https://pyfr.discourse.group/t/saving-conserved-variables-in-vtu-files/1029 "2024-02-13T13:52:42Z")
Hi! I was wondering if there is a way, when running the pyfr export command, to write the conserved variables into the .vtu files, rather than converting them to the primitive variables. Thanks! --- ## [PyFR for jet noise](https://pyfr.discourse.group/t/pyfr-for-jet-noise/1026)
**Author:** [@Tiger8885](https://pyfr.discourse.group/u/Tiger8885)\ **Replies:** 1\ **Last updated:** [12 February 2024 19:23 UTC](https://pyfr.discourse.group/t/pyfr-for-jet-noise/1026 "2024-02-12T19:23:02Z")
Hello, I’m interested in studying the flow and noise from two-stream internally-mixed supersonic nozzles, and I’m wondering how suitable PyFR would be for this application. I’ve read through the documentation, forum, an… --- ## [Is PyFR capable of using Overset Mesh?](https://pyfr.discourse.group/t/is-pyfr-capable-of-using-overset-mesh/889)
**Author:** [@RDarshan](https://pyfr.discourse.group/u/RDarshan)\ **Replies:** 1\ **Last updated:** [1 August 2023 09:57 UTC](https://pyfr.discourse.group/t/is-pyfr-capable-of-using-overset-mesh/889 "2023-08-01T09:57:50Z")
I want to solve supersonic external flow problems using PyFR, Can I use overset mesh in PyFR? I noticed it in the future roadmap, I want to know whether its available now. Thanks. --- ## [Rough estimate for cost of DNS at Re=400000](https://pyfr.discourse.group/t/rough-estimate-for-cost-of-dns-at-re-400000/883)
**Author:** [@steve](https://pyfr.discourse.group/u/steve)\ **Replies:** 2\ **Last updated:** [25 July 2023 16:22 UTC](https://pyfr.discourse.group/t/rough-estimate-for-cost-of-dns-at-re-400000/883 "2023-07-25T16:22:28Z")
I am looking for an order of magnitude estimate for the cost or running a scale resolved DNS solution on an object with transition and significant separation at a Re of 400k. For units I am thinking perhaps A100 hours m… --- ## [How to do a simple test of pyFR on grids of different orders?](https://pyfr.discourse.group/t/how-to-do-a-simple-test-of-pyfr-on-grids-of-different-orders/880)
**Author:** [@studyhardhardhard](https://pyfr.discourse.group/u/studyhardhardhard)\ **Replies:** 7\ **Last updated:** [18 July 2023 01:32 UTC](https://pyfr.discourse.group/t/how-to-do-a-simple-test-of-pyfr-on-grids-of-different-orders/880 "2023-07-18T01:32:24Z")
Hello everyone, as a newcomer to pyFR, I have some questions regarding the configuration of the solver. My main concern is how to set the solver’s order based on the grid order in the msh file. Due to my lack of knowle… --- ## [Setting the initial condition from a file?](https://pyfr.discourse.group/t/setting-the-initial-condition-from-a-file/400)
**Author:** [@Zhenyang](https://pyfr.discourse.group/u/Zhenyang)\ **Replies:** 7\ **Last updated:** [24 May 2021 20:40 UTC](https://pyfr.discourse.group/t/setting-the-initial-condition-from-a-file/400 "2021-05-24T20:40:50Z")
Hi guys, Just wondering if pyfr can use a data file containing fluid field variables as the initial condition. I want to do a benchmark between pyfr and nektar and I want to use fluid field from nektar output to restart… --- ## [Spurious oscillations near the inlet for 3D cylinder with periodic BCs](https://pyfr.discourse.group/t/spurious-oscillations-near-the-inlet-for-3d-cylinder-with-periodic-bcs/559)
**Author:** [@Fellshock](https://pyfr.discourse.group/u/Fellshock)\ **Replies:** 6\ **Last updated:** [21 February 2022 20:27 UTC](https://pyfr.discourse.group/t/spurious-oscillations-near-the-inlet-for-3d-cylinder-with-periodic-bcs/559 "2022-02-21T20:27:17Z")
I’m trying to run an incompressible 3D cylinder case at about Re=300 with periodic BCs in the z-direction. The solution does not NaN, but some spurious oscillations show up near the inlet which substantially degrade the … --- ## [Instability does not start based on timestep](https://pyfr.discourse.group/t/instability-does-not-start-based-on-timestep/446)
**Author:** [@tse](https://pyfr.discourse.group/u/tse)\ **Replies:** 5\ **Last updated:** [27 July 2021 16:10 UTC](https://pyfr.discourse.group/t/instability-does-not-start-based-on-timestep/446 "2021-07-27T16:10:58Z")
Hi, I’m new to PyFR and have been learning how to use it by simulating some flows with basic geometries. I noticed that for instance with a half cylinder case, the start of the vortex shedding instability behind the gob… --- ## [Accessing coordinates of solution points](https://pyfr.discourse.group/t/accessing-coordinates-of-solution-points/430)
**Author:** [@Fellshock](https://pyfr.discourse.group/u/Fellshock)\ **Replies:** 3\ **Last updated:** [13 July 2021 17:33 UTC](https://pyfr.discourse.group/t/accessing-coordinates-of-solution-points/430 "2021-07-13T17:33:38Z")
Which class member(s) of a PyFR integrator can I use to access the coordinates of the solution points? (i.e. the coordinates corresponding to the solution values accessible via the ‘soln’ property of a PyFR integrator) I… --- ## [High order gmsh support](https://pyfr.discourse.group/t/high-order-gmsh-support/413)
**Author:** [@Zhenyang](https://pyfr.discourse.group/u/Zhenyang)\ **Replies:** 7\ **Last updated:** [9 June 2021 15:29 UTC](https://pyfr.discourse.group/t/high-order-gmsh-support/413 "2021-06-09T15:29:10Z")
Hi, I am trying to import high order mesh generated by Gmsh to Pyfr. However, some of the high order mesh element type (i.e type 28, fifth order edge) is not supported. Do you know how can I process this kind of mesh an… --- ## [State equations and viscosity](https://pyfr.discourse.group/t/state-equations-and-viscosity/377)
**Author:** [@nathanbl](https://pyfr.discourse.group/u/nathanbl)\ **Replies:** 2\ **Last updated:** [13 April 2021 09:27 UTC](https://pyfr.discourse.group/t/state-equations-and-viscosity/377 "2021-04-13T09:27:03Z")
Hello all, several questions about the navier stokes solver. couldnt find answers in the user’s guide What state equation is employed in solution of navier-stokes? Is it the ideal gas equation? What if I want to solve … --- ## [Visual Studio 2013 runs PyFR](https://pyfr.discourse.group/t/visual-studio-2013-runs-pyfr/98)
**Author:** [@nnunn](https://pyfr.discourse.group/u/nnunn)\ **Replies:** 0\ **Last updated:** [19 December 2015 19:18 UTC](https://pyfr.discourse.group/t/visual-studio-2013-runs-pyfr/98 "2015-12-19T19:18:55Z")
Hi Peter and Freddie, Good news: I wanted to step through your PyFR User Guide demos, but having never touched Python, was not sure how to proceed. Only experience is with Visual Studio/C++ on Win64. Then I bumped into… --- ## [First run of couette flow: only one CPU core and low GPU usage, is that normal?](https://pyfr.discourse.group/t/first-run-of-couette-flow-only-one-cpu-core-and-low-gpu-usage-is-that-normal/201)
**Author:** [@Mahmood\_Naderan](https://pyfr.discourse.group/u/Mahmood_Naderan)\ **Replies:** 1\ **Last updated:** [22 March 2018 23:49 UTC](https://pyfr.discourse.group/t/first-run-of-couette-flow-only-one-cpu-core-and-low-gpu-usage-is-that-normal/201 "2018-03-22T23:49:51Z")
Hi According to the user guide, I ran the couette\_flow\_2d example and saw an output like below mahmood@orca:\\~$ cp \\-r /opt/PyFR\\-1\\.7\\.5/examples/couette\\\_flow\\\_2d/ \\. mahmood@orca:\\~$ cd couette\\\_flow\\\_2d/ mahmood@o… [Next page](https://pyfr.discourse.group/c/just-starting/7.md?page=1)