Altair ultraFluidX 2019 Release Notes
New Features
- Mesh import
- You can now reuse an existing discretization from a previous ultraFluidX simulation to skip the meshing step and save computational time.
- Increased performance
- Simulation performance has increased due to internal code restructuring and a new data structure for the wall modeling.
Enhancements
- Velocity information on rotating and moving surfaces
- Velocity information is now displayed on rotating and moving no-slip walls in the surface data to be able to visualize the correct setting of rotating and moving boundary conditions.
- Sectional force coefficients in y- and z-direction
- Force coefficient output has been enhanced with full sectional coefficients in y- and z-direction, according to a user-specified number of sections. This supersedes the previously available z-split of the force coefficient output.
- Averaged mass flow included in the summary
- Averaged mass flow files are now created, and report the averaged mass flow per porous medium in the simulation summary file.
- Improved surface mapping at the transition of refinement levels
- The method used for evaluating macroscopic data at the transition of refinement levels for the surface mapping has been improved. This yields a better representation of surface data in areas where the grid is refined near the surface of the obstacle.
- Possibility to specify start iterations for all output categories
- You can now specify when to start the output for each of the available output categories. This feature can be used to generate high-frequency output for a specific part of the domain or the full volume data once the initial transient phase is completed.
- Selection of output variables
- You can now select the field variables that should be included in the output.
- Monochromatic acoustic point source
- A monochromatic acoustic wave with prescribed amplitude and frequency can now be injected into the simulation.
- Probe output in sub-iterations
- Probe output now also is enabled in sub-time steps instead of the coarsest iteration only. This can be used to extract high-resolution results for acoustic analyses. In the same breadth, buffers in probe output and drag/lift files now are flushed in every iteration.
- Improved temporal and spatial averaging in the wall modeling
- Temporal and spatial averaging has been improved for the coupling of the wall model to the transient LES bulk scheme.
- Write void triangles to a separate output file
- Void triangles that are detected during the meshing are now stored separately in the uFX_meshData folder.
- Reorganization of the output data
- Altair ultraFluidX 2019 results are now stored in separate output folders for surface data, volume data, full data, and so on.
- Output of memory consumption during meshing and simulation
- Information on the maximum memory consumption during meshing and simulation (CPU+GPU) is now included in the Altair ultraFluidX simulation summary.
- Treatment of periodic domain boundaries
- Object surfaces that are intersecting with periodic domain boundary conditions are now supported.
Resolved Issues
- The aerodynamic forces were not correctly considered on the inverted side of baffle parts.
- If the bounding box for a section cut was not given in the input solver deck, it was initialized with (0.0, 0.0, 0.0) instead of the size of the domain bounding box.
- The extent of turbulence regions was accidentally taken into account for the coordinates of the sectional force coefficients.
- The averaging time scale in the wall model was scaled incorrectly.
- The calculated projected front surface depended on the mesh setup for some cases.
- Ramp-up failed for cases with large time steps.
- <saved_states> parameter was ignored.