Altair ultraFluidX 2025 Release Notes
New Features
- Introduction of additional output variables
- ultraFluidX 2025 directly outputs the standard deviation (STD) and variance of pressure enabling advanced and fast analysis of flow statistics. Additionally, you now have the option to output velocity magnitude instead of, or in addition to, the velocity components. Velocity magnitude output in place of the velocity components lead to a reduction of disk space by approximately 66 percent.
- Coarsening of outputs
- Prior to this release, displaying volumetric quantities such as 3D streamlines and iso-surfaces required large amount of disk space and significant time to post-process, particularly for transient and production level datasets. To address this, ultraFluidX 2025 allows output to be written at a coarser resolution than that used during simulation. This approach preserves the accurately of the computations while reducing output file sizes by aggregating multiple voxel values into a single, coarser voxel. Using a refinement-based strategy, one level of coarsening is available, 2x2x2. Assuming a region space discretized with a single resolution, a 2x2x2 coarsening would lead to a reduction of the output data size by approximatively 8x.
Enhancements
- Output bounding boxes
- ultraFluidX 2025 enhances output versatility by introducing bounding boxes for full output and/or selected surfaces. This feature, building on the existing functionality for partial volumes, enables you to define specific regions of interest within the flow field for more targeted data export. You can now write one or multiple subsets of volume and surface data, concentrating on the most critical areas of analysis, which improves both data relevance and storage efficiency.
- Reducing export time and memory requirements for writing H3D files
- ultraFluidX 2025 introduces an improved H3D output files algorithm resulting in significantly shorter export times. Additionally, memory usage on the calculation node for merging data across all ranks into a single file has been substantially reduced, enhancing data export performance and efficiency. These improvements are particularly beneficial for Computational Aeroacoustics (CAA) solutions, where managing large datasets is essential for accurately capturing transient and acoustic phenomena.
- Extension of the virtual fan model
- In ultraFluidX 2025, the virtual fan model, used to simulate fan effects on the flow field via a source region, has been enhanced to include the pressure loss (resistance) induced by the fan. Additionally, a new method has been introduced for modeling the tangential velocity. Alongside the existing Hough-Ordway method, you now have the option to employ a linear relation, linking circumferential speed to rotational speed and position within the fan plane. These updates provide greater flexibility and precision for modeling fan-driven airflow dynamics in complex simulations.