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Welcome to the NVIDIA PhysicsNeMo blog! Here you'll find the latest insights, tutorials, and updates about the PhysicsNeMo framework. Discover how neural operators, GNNs, and generative AI models can enhance your engineering simulations and workflows.

Don’t Yet Trust the Model, Test the Physics

AI physics models are advancing quickly and are beginning to prove their value in enterprise engineering workflows. But a critical bottleneck remains: rigorous, repeatable evaluation. Comparing a new model against the current state of the art still too often means stitching together datasets, metrics, scripts, and baselines by hand. That keeps evaluation behind a skill curtain and slows down both model development and domain expert adoption. To push the state of the art forward at the speed of light, we need to make evaluation easier for the people who understand the physics, the data, and the edge cases best. Their feedback will enable the AI researchers to surgically operate and build new bleeding edge models. This blog highlights the new and improved PhysicsNeMo CFD module to address the current gaps and strengthen this loop between model developers and model evaluators.

Introducing PhysicsNeMo-Mesh: GPU-Accelerated Mesh Processing for Scientific ML

PhysicsNeMo-Mesh is a GPU-accelerated mesh processing module, built on PyTorch and TensorDict, and included in the open-source PhysicsNeMo library. It provides a) a GPU-native, high-performance mesh data structure with design choices that are particularly well-suited for ML workflows, and b) a diverse suite of accelerated mesh operations that can be used to bridge existing gaps between data preprocessing and training/inference.

Its native data format allows loading meshes from disk much more quickly than VTU (9x-88x faster in our testing; hardware-dependent) while preserving the full mesh structure that flat tensor formats like zarr typically discard. This gives you the speed you need for training while retaining the geometric and physical context needed for model- and dataset-agnostic workflows. In this post, we'll show what PhysicsNeMo-Mesh can do for your training pipeline.

Training AI Physics Models for Transient Structural Mechanics Simulations such as Automotive Crash

Simulating automotive crash is one of the most complex computational workloads in computer-aided engineering (CAE). Crash simulation is a highly non-linear, dynamic event that happens in milliseconds. Therefore automotive crash simulations face significant bottlenecks in both human-driven workflows and raw computational demands. These challenges stem from the need to model highly non-linear, split-second events with extreme accuracy to meet strict regulatory standards (like NHTSA or Euro NCAP).

Optimizing and Scaling DoMINO

DoMINO is one of the most popular and accurate models in PhysicsNeMo, with top accuracy metrics as measured by physicsnemo-cfd. Originally developed by and for PhysicsNeMo, DoMINO has been overhauled for performance optimizations and scale out enhancements. In this blog post, we'll highlight the performance enhancements we've made to DoMINO - giving more than 30x end to end speed up on DrivAerML training - as well as how you can use them from PhysicsNeMo for your own models.