Altair ultraFluidX 2022.2 Release Notes

New Features

Define radius/diameter of surface and volume probes
ultraFluidX probes snap to the closest voxel (volume probes) or surface triangle (surface probes) and output the voxel/triangle data with a user-defined output frequency. With this release, you can define the radius/diameter of a surface or volume probe. Radius-based volume and surface probes snap to the nearest fluid voxel in the volume and to the nearest boundary voxel attached to the surface, respectively. All available voxel data within the specified radius around the snapping point is considered. The option is available for both volume and surface probes and can be applied to a single probe or probe files.
High-fidelity mapping for coarse surface meshes
ultraFluidX maps data from the Cartesian voxel mesh to the surface triangles for force integration and (partial) surface outputs. By default, surface triangles are refined to an edge length of three times the local voxel size before the mapping (“triangle splitting”). The overhead of triangle splitting is prohibitive for highly resolved cases with voxels much smaller than the surface triangle size. In this release, an efficient alternative mapping procedure is introduced. The new procedure outputs the results on the original coarse surface mesh while using a more accurate integration technique internally. The new high-fidelity surface mapping can be activated globally or on a per-part basis. It improves the accuracy of high-frequency recordings of surface pressure fluctuations for coarse surface meshes (relative to the local voxel size).


Mesh parameter to control default number of refinement level transitions
You can now modify the number of voxel layers between subsequent refinement levels via the new <meshing> <general> <refinement_level_transition_layers> parameter. The parameter also controls the minimum number of voxel layers close to a solid surface. The default value is 4, which is also the minimum number of layers accepted by ultraFluidX. Lower values are automatically corrected to 4.

Resolved Issues

  • The snapping behavior of volume probes has been improved. Volume probes now snap to the closest fluid node of any kind.