# Physics Simulation **URL:** https://forums.developer.nvidia.com/c/physics-simulation/442.md [Latest](https://forums.developer.nvidia.com/latest.md) · [Categories](https://forums.developer.nvidia.com/categories.md) · [Tags](https://forums.developer.nvidia.com/tags.md) --- ## [PhysicsNeMo guidance for two counter-rotating hydrokinetic rotors](https://forums.developer.nvidia.com/t/physicsnemo-guidance-for-two-counter-rotating-hydrokinetic-rotors/378622)
**Author:** [@bartschalex](https://forums.developer.nvidia.com/u/bartschalex)\ **Replies:** 0\ **Last updated:** [July 30, 2026, 5:40pm UTC](https://forums.developer.nvidia.com/t/physicsnemo-guidance-for-two-counter-rotating-hydrokinetic-rotors/378622 "2026-07-30T17:40:55Z")
TEXTO\_NVIDIA\_LISTO\_PARA\_COPIAR.txt (5.0 KB) Hello NVIDIA PhysicsNeMo team. Please see the attached technical description and questions regarding our reversible hydrokinetic system. --- ## [AVRCK 3.0: Reducing Inference Cost by Routing Causal Gaps Across Local and Cloud Models](https://forums.developer.nvidia.com/t/avrck-3-0-reducing-inference-cost-by-routing-causal-gaps-across-local-and-cloud-models/376839)
**Author:** [@ken0963521](https://forums.developer.nvidia.com/u/ken0963521)\ **Replies:** 0\ **Last updated:** [July 14, 2026, 3:12pm UTC](https://forums.developer.nvidia.com/t/avrck-3-0-reducing-inference-cost-by-routing-causal-gaps-across-local-and-cloud-models/376839 "2026-07-14T15:12:14Z")
I recently read NVIDIA’s article on full-stack inference software and lowering token costs: NVIDIA is addressing one side of the inference-cost equation: - Lower cost per token - Higher throughput - Better GPU u… --- ## [Built a groundwater prediction model on PhysicsNeMo, looking for feedback on the port](https://forums.developer.nvidia.com/t/built-a-groundwater-prediction-model-on-physicsnemo-looking-for-feedback-on-the-port/375378)
**Author:** [@abdoulrachid03](https://forums.developer.nvidia.com/u/abdoulrachid03)\ **Replies:** 0\ **Last updated:** [July 3, 2026, 12:15am UTC](https://forums.developer.nvidia.com/t/built-a-groundwater-prediction-model-on-physicsnemo-looking-for-feedback-on-the-port/375378 "2026-07-03T00:15:21Z")
Hi all, I’ve been using PhysicsNeMo to build a model that predicts groundwater levels across a network of monitoring wells in Taiwan, and I wanted to share it here to get some feedback from people who know the framework… --- ## [Modulus for HF Microstrip Simulation](https://forums.developer.nvidia.com/t/modulus-for-hf-microstrip-simulation/270807)
**Author:** [@pgtrem](https://forums.developer.nvidia.com/u/pgtrem)\ **Replies:** 1\ **Last updated:** [May 18, 2026, 5:59am UTC](https://forums.developer.nvidia.com/t/modulus-for-hf-microstrip-simulation/270807 "2026-05-18T05:59:59Z")
Hi together, I’m currently working on Simulations of Microstrip components as for example Directional Coupler as seen in the picture. The simulation can be done with commercial (FEM, FDM, MM) tools. As I am interested i… --- ## [Not able to watch ondemand playlist videos](https://forums.developer.nvidia.com/t/not-able-to-watch-ondemand-playlist-videos/370297)
**Author:** [@gabriel.perez](https://forums.developer.nvidia.com/u/gabriel.perez)\ **Replies:** 0\ **Last updated:** [May 15, 2026, 10:39pm UTC](https://forums.developer.nvidia.com/t/not-able-to-watch-ondemand-playlist-videos/370297 "2026-05-15T22:39:05Z")
--- ## [Run earth2studio fcn3 on Nvidia LS40s with 46Gb memory, but out of memory](https://forums.developer.nvidia.com/t/run-earth2studio-fcn3-on-nvidia-ls40s-with-46gb-memory-but-out-of-memory/369811)
**Author:** [@ludwigwoo12](https://forums.developer.nvidia.com/u/ludwigwoo12)\ **Replies:** 0\ **Last updated:** [May 12, 2026, 8:08am UTC](https://forums.developer.nvidia.com/t/run-earth2studio-fcn3-on-nvidia-ls40s-with-46gb-memory-but-out-of-memory/369811 "2026-05-12T08:08:13Z")
My code is as follows: import os import gc import torch import shutil # 1. Set environment flag BEFORE any torch calls os.environ\[“PYTORCH\_CUDA\_ALLOC\_CONF”\] = “expandable\_segments:True” # 2. Force clear everything… --- ## [Virtual Foundary GraphNet: FileNotFoundError](https://forums.developer.nvidia.com/t/virtual-foundary-graphnet-filenotfounderror/368897)
**Author:** [@preethampai](https://forums.developer.nvidia.com/u/preethampai)\ **Replies:** 1\ **Last updated:** [May 11, 2026, 4:02am UTC](https://forums.developer.nvidia.com/t/virtual-foundary-graphnet-filenotfounderror/368897 "2026-05-11T04:02:14Z")
v2508 : Is the below file changed or dependency moved ? \[Errno 2\] No such file or directory: ‘./data/test\_validation/metadata.json’ --- ## [Nvidia GPU Statistics error](https://forums.developer.nvidia.com/t/nvidia-gpu-statistics-error/361107)
**Author:** [@mark\_coffey](https://forums.developer.nvidia.com/u/mark_coffey)\ **Replies:** 1\ **Last updated:** [April 20, 2026, 12:09pm UTC](https://forums.developer.nvidia.com/t/nvidia-gpu-statistics-error/361107 "2026-04-20T12:09:20Z")
Hello, I hope this is the correct channel. I’m experiencing an issue with my GPU losing communication with GPU Statistics, as the Error Vendor command returned unparsable data. When I run nvidia-smi from the terminal, n… --- ## [Earth2Studio](https://forums.developer.nvidia.com/t/earth2studio/365349)
**Author:** [@ksood315](https://forums.developer.nvidia.com/u/ksood315)\ **Replies:** 0\ **Last updated:** [April 1, 2026, 11:36am UTC](https://forums.developer.nvidia.com/t/earth2studio/365349 "2026-04-01T11:36:09Z")
I am running Earth2Studio\[FCN3,GFS\] on RTX A 6000 GPU but getting out of memory error despite having the full GPU free. --- ## [Running Eart2Studio FCN3 and GFS on RTX A 6000](https://forums.developer.nvidia.com/t/running-eart2studio-fcn3-and-gfs-on-rtx-a-6000/365346)
**Author:** [@ksood315](https://forums.developer.nvidia.com/u/ksood315)\ **Replies:** 0\ **Last updated:** [April 1, 2026, 11:21am UTC](https://forums.developer.nvidia.com/t/running-eart2studio-fcn3-and-gfs-on-rtx-a-6000/365346 "2026-04-01T11:21:07Z")
I am running earth2studio on my RTX A 6000 GPU, I am using FCN3 model and GFS data but get the out of memory error even though my GPU is free and not occupied. Can anyone help me in running the inference --- ## [Training time and GPUs used](https://forums.developer.nvidia.com/t/training-time-and-gpus-used/364100)
**Author:** [@shinyjn20](https://forums.developer.nvidia.com/u/shinyjn20)\ **Replies:** 0\ **Last updated:** [March 19, 2026, 6:06pm UTC](https://forums.developer.nvidia.com/t/training-time-and-gpus-used/364100 "2026-03-19T18:06:51Z")
Hello. I’m currently working with the diffusion-fwi model of physicsnemo. Could you please share how many GPUs were used during training, and roughly how long it took to arrive at your results? Thank you. --- ## [How to create curtain-like rope simulation in Omniverse issacSIm?](https://forums.developer.nvidia.com/t/how-to-create-curtain-like-rope-simulation-in-omniverse-issacsim/359596)
**Author:** [@m.nishimura](https://forums.developer.nvidia.com/u/m.nishimura)\ **Replies:** 1\ **Last updated:** [February 10, 2026, 7:17pm UTC](https://forums.developer.nvidia.com/t/how-to-create-curtain-like-rope-simulation-in-omniverse-issacsim/359596 "2026-02-10T19:17:37Z")
Hello!! In one of the videos shown in this NVIDIA video (https://youtu.be/7ozs5EsvVGE)、 there is a scene where a group of strings (like a curtain) hangs down and drapes along a colliding object. I attached a scene. I… --- ## [Please reload credits](https://forums.developer.nvidia.com/t/please-reload-credits/359469)
**Author:** [@todd.mcdevitt](https://forums.developer.nvidia.com/u/todd.mcdevitt)\ **Replies:** 0\ **Last updated:** [February 3, 2026, 1:22am UTC](https://forums.developer.nvidia.com/t/please-reload-credits/359469 "2026-02-03T01:22:34Z")
Please reload some 12 hours of cloud credits, so I can complete the following course: Accelerating Computer-Aided Engineering (CAE) with NVIDIA AI Physics Technology I’ve been unable to progress past the first notebook… --- ## [TX scheduled packets from ConnectX 6 or 7](https://forums.developer.nvidia.com/t/tx-scheduled-packets-from-connectx-6-or-7/358336)
**Author:** [@avi39](https://forums.developer.nvidia.com/u/avi39)\ **Replies:** 0\ **Last updated:** [January 22, 2026, 12:39pm UTC](https://forums.developer.nvidia.com/t/tx-scheduled-packets-from-connectx-6-or-7/358336 "2026-01-22T12:39:04Z")
Looking for a working example of sending scheduled packets from ConnectX 6 or 7 --- ## [Import error: No module named 'physicsnemo.sym'](https://forums.developer.nvidia.com/t/import-error-no-module-named-physicsnemo-sym/357999)
**Author:** [@ryan.guo](https://forums.developer.nvidia.com/u/ryan.guo)\ **Replies:** 0\ **Last updated:** [January 19, 2026, 9:33am UTC](https://forums.developer.nvidia.com/t/import-error-no-module-named-physicsnemo-sym/357999 "2026-01-19T09:33:45Z")
GitHub Issue Draft (English) Title: ImportError: No module named ‘physicsnemo.sym’ during inference.py execution Environment: OS: Linux (Please specify your distro, e.g., Ubuntu 24.04) CUDA Version: 12.9 Python… --- ## [Where can I find an example of solving a partial differential equation using NeMo-ML framework?](https://forums.developer.nvidia.com/t/where-can-i-find-an-example-of-solving-a-partial-differential-equation-using-nemo-ml-framework/357373)
**Author:** [@feig](https://forums.developer.nvidia.com/u/feig)\ **Replies:** 0\ **Last updated:** [January 12, 2026, 4:50pm UTC](https://forums.developer.nvidia.com/t/where-can-i-find-an-example-of-solving-a-partial-differential-equation-using-nemo-ml-framework/357373 "2026-01-12T16:50:07Z")
Hello, I am interested in testing some ideas in electromagnetic simulation for some product related applications. I was trying to start with matlab because there are PDE tool box as well other related tool boxes for th… --- ## [Anisotropic material property fir deformable bodies](https://forums.developer.nvidia.com/t/anisotropic-material-property-fir-deformable-bodies/353998)
**Author:** [@bhateshfaz](https://forums.developer.nvidia.com/u/bhateshfaz)\ **Replies:** 1\ **Last updated:** [December 29, 2025, 5:55am UTC](https://forums.developer.nvidia.com/t/anisotropic-material-property-fir-deformable-bodies/353998 "2025-12-29T05:55:17Z")
Hello Does anyone here have experience working with deformable bodies in Isaac Sim? I’m trying to figure out if there is any way to make a deformable object anisotropic (different stiffness in different directions). I… --- ## [How to add a drag term to the Navier-Stokes equations and find the velocity derivative with respect to this term](https://forums.developer.nvidia.com/t/how-to-add-a-drag-term-to-the-navier-stokes-equations-and-find-the-velocity-derivative-with-respect-to-this-term/355604)
**Author:** [@XavierLucas](https://forums.developer.nvidia.com/u/XavierLucas)\ **Replies:** 0\ **Last updated:** [December 24, 2025, 6:19am UTC](https://forums.developer.nvidia.com/t/how-to-add-a-drag-term-to-the-navier-stokes-equations-and-find-the-velocity-derivative-with-respect-to-this-term/355604 "2025-12-24T06:19:51Z")
The link is the example that solves the lid driven cavity based on PINN. But I want to add a drag term of (-alpha\*u, -alpha\*v) to the Navier-Stokes equations. After training, find the velocity derivative with respect t… --- ## [TensorRT for Blackwell - DGX Spark](https://forums.developer.nvidia.com/t/tensorrt-for-blackwell-dgx-spark/355279)
**Author:** [@sanjaykumar.rajarao](https://forums.developer.nvidia.com/u/sanjaykumar.rajarao)\ **Replies:** 0\ **Last updated:** [December 21, 2025, 9:17am UTC](https://forums.developer.nvidia.com/t/tensorrt-for-blackwell-dgx-spark/355279 "2025-12-21T09:17:58Z")
Error while building image: Error Code: 9: Skipping tactic 0x0000000000000000 due to exception No Myelin Error exists \[12/21/2025-09:05:40\] \[TRT\] \[E\] \[convBaseBuilder.cpp::addGenericTactic::1622\] Error Code 2: Internal… --- ## [Model not capturing Key.scale parameters;](https://forums.developer.nvidia.com/t/model-not-capturing-key-scale-parameters/352581)
**Author:** [@gptkzm](https://forums.developer.nvidia.com/u/gptkzm)\ **Replies:** 0\ **Last updated:** [November 25, 2025, 10:16am UTC](https://forums.developer.nvidia.com/t/model-not-capturing-key-scale-parameters/352581 "2025-11-25T10:16:48Z")
I am using the NVIDIA PhysicsNeMo framework to train a DeepONet model for a fluid dynamics problem. I have calculated the mean ($\\mu$) and standard deviation ($\\sigma$) for all input and output variables, and I am passin… --- ## [openGL visualization error when trying to run basic example with newton?](https://forums.developer.nvidia.com/t/opengl-visualization-error-when-trying-to-run-basic-example-with-newton/352112)
**Author:** [@rsonawane2002](https://forums.developer.nvidia.com/u/rsonawane2002)\ **Replies:** 0\ **Last updated:** [November 20, 2025, 7:49pm UTC](https://forums.developer.nvidia.com/t/opengl-visualization-error-when-trying-to-run-basic-example-with-newton/352112 "2025-11-20T19:49:55Z")
I followed the instructions here: To set up newton properly. I was able to clone the directory and then cd into it and run: curl -LsSf https://astral.sh/uv/install.sh | sh When I run this example: uv run -m newton.… --- ## [Bug Report Summary | Product : NVIDIA NIM for Image OCR (NeMo Retriever OCR v1) | Version: 1.1.0 | Severity: High (Production Blocker)](https://forums.developer.nvidia.com/t/bug-report-summary-product-nvidia-nim-for-image-ocr-nemo-retriever-ocr-v1-version-1-1-0-severity-high-production-blocker/351835)
**Author:** [@elibrown0731](https://forums.developer.nvidia.com/u/elibrown0731)\ **Replies:** 0\ **Last updated:** [November 18, 2025, 1:46pm UTC](https://forums.developer.nvidia.com/t/bug-report-summary-product-nvidia-nim-for-image-ocr-nemo-retriever-ocr-v1-version-1-1-0-severity-high-production-blocker/351835 "2025-11-18T13:46:57Z")
NVIDIA Bug Report - NeMo Retriever OCR NIM v1.1.0 Bug Report Summary Product: NVIDIA NIM for Image OCR (NeMo Retriever OCR v1) Version: 1.1.0 Severity: High (Production Blocker) Status: Reproducible 100% Title: Stub… --- ## [How to use PhysX in repo.bat Composer](https://forums.developer.nvidia.com/t/how-to-use-physx-in-repo-bat-composer/351540)
**Author:** [@ryan.salway](https://forums.developer.nvidia.com/u/ryan.salway)\ **Replies:** 0\ **Last updated:** [November 16, 2025, 4:54pm UTC](https://forums.developer.nvidia.com/t/how-to-use-physx-in-repo-bat-composer/351540 "2025-11-16T16:54:38Z")
Now that the Composer launcher is deprecated and PhysX menus are deprecated and Blender extension is Deprecated etc. How do you get Physx to work in a repo.bat build / launch kit? I have every single Omni Physics and Ph… --- ## [DoMINO Aero NIM - lack of symmetry in results, erroneous sections on sample body](https://forums.developer.nvidia.com/t/domino-aero-nim-lack-of-symmetry-in-results-erroneous-sections-on-sample-body/350291)
**Author:** [@scott236](https://forums.developer.nvidia.com/u/scott236)\ **Replies:** 0\ **Last updated:** [November 5, 2025, 12:29pm UTC](https://forums.developer.nvidia.com/t/domino-aero-nim-lack-of-symmetry-in-results-erroneous-sections-on-sample-body/350291 "2025-11-05T12:29:01Z")
Hi, I’ve just setup the DoMINO NIM and have it running. When testing the provided geometry from the quickstart guide I get results that are not symmetrical or correct when compared with the images at the bottom of the … --- ## [CUDA error: operation not permitted when stream is capturing](https://forums.developer.nvidia.com/t/cuda-error-operation-not-permitted-when-stream-is-capturing/242335)
**Author:** [@shubhamsp2195](https://forums.developer.nvidia.com/u/shubhamsp2195)\ **Replies:** 2\ **Last updated:** [October 29, 2025, 3:41pm UTC](https://forums.developer.nvidia.com/t/cuda-error-operation-not-permitted-when-stream-is-capturing/242335 "2025-10-29T15:41:58Z")
Execution of my modulus code is resulting in the following error. \[code\] \[06:15:56\] - attempting to restore from: outputs/Battery \[06:15:56\] - Success loading optimizer: outputs/Battery/optim\_checkpoint.0.pth \[06:15:56\]… --- ## [Physx sweep\_mesh\_all does not read from usdrt hirarchy?](https://forums.developer.nvidia.com/t/physx-sweep-mesh-all-does-not-read-from-usdrt-hirarchy/349296)
**Author:** [@julian.schwarz](https://forums.developer.nvidia.com/u/julian.schwarz)\ **Replies:** 1\ **Last updated:** [October 28, 2025, 12:03pm UTC](https://forums.developer.nvidia.com/t/physx-sweep-mesh-all-does-not-read-from-usdrt-hirarchy/349296 "2025-10-28T12:03:39Z")
I started changing my implementation for reading and writing prim transforms from usd to fabric (usdrt) for performance reasons. But then I run into issues when I was using the Physx API. It seems like the sweep\_mesh\_all… --- ## [DoMINO Inference Recipe Steps](https://forums.developer.nvidia.com/t/domino-inference-recipe-steps/348544)
**Author:** [@preethampai](https://forums.developer.nvidia.com/u/preethampai)\ **Replies:** 0\ **Last updated:** [October 21, 2025, 6:24pm UTC](https://forums.developer.nvidia.com/t/domino-inference-recipe-steps/348544 "2025-10-21T18:24:22Z")
Hello, Trying to follow the instructions of End to End AI for Science Bootcamp using PhysicsNeMo. The works flow breaks in the DoMINO Inference Recipe anyone knows what’s missing . maybe it ( ipynb is older ) was … --- ## [Interface Problem by Variational Method - Discontinuous Formulation](https://forums.developer.nvidia.com/t/interface-problem-by-variational-method-discontinuous-formulation/288451)
**Author:** [@Julie\_Orin](https://forums.developer.nvidia.com/u/Julie_Orin)\ **Replies:** 1\ **Last updated:** [August 6, 2025, 8:53am UTC](https://forums.developer.nvidia.com/t/interface-problem-by-variational-method-discontinuous-formulation/288451 "2025-08-06T08:53:43Z")
Hello. I would like to solve a problem with two materials and interface conditions. I would like to know if it is possible to define a multi-domain PINN with NVIDIA modulus, which implies one NN per domain for each physi… --- ## [The training doesn't work after subtracting the 3D models](https://forums.developer.nvidia.com/t/the-training-doesnt-work-after-subtracting-the-3d-models/340720)
**Author:** [@Yingkai159](https://forums.developer.nvidia.com/u/Yingkai159)\ **Replies:** 0\ **Last updated:** [July 30, 2025, 9:58am UTC](https://forums.developer.nvidia.com/t/the-training-doesnt-work-after-subtracting-the-3d-models/340720 "2025-07-30T09:58:42Z")
I’ve encountered some difficulties while using the PhysicsNeMo library. My project focuses on studying the flow field around a probe inside a wind tunnel. Initially, I followed the approach used in the aneurysm example a… --- ## [Please tell me how to fix physx sdk 5 buid error](https://forums.developer.nvidia.com/t/please-tell-me-how-to-fix-physx-sdk-5-buid-error/339722)
**Author:** [@militiaman0317](https://forums.developer.nvidia.com/u/militiaman0317)\ **Replies:** 0\ **Last updated:** [July 21, 2025, 9:32am UTC](https://forums.developer.nvidia.com/t/please-tell-me-how-to-fix-physx-sdk-5-buid-error/339722 "2025-07-21T09:32:15Z")
When I download PhysX from GitHub and run generate\_projects.bat on Windows, I get an ‘Access Denied’ error. How can I fix this? [Next page](https://forums.developer.nvidia.com/c/physics-simulation/442.md?page=1)