Altair nanoFluidX 2021 Release Notes

Highlights

Tartakovsky single phase surface tension model
The Tartakovsky model allows for easier definition of the surface tension coefficient as it is designed so that the numerical value exactly corresponds to the physical value. This should, in principle, remove iterative tuning of the single phase surface tension parameters, provided sufficient resolution and adequate speed of sound/compressibility.

New Features

Tartakovsky single phase surface tension model
The Tartakovsky model allows for easier definition of the surface tension coefficient as it is designed so that the numerical value exactly corresponds to the physical value. This should, in principle, remove iterative tuning of the single phase surface tension parameters, provided sufficient resolution and adequate speed of sound/compressibility.

Enhancements

Self-generated point cloud
Ability to export a self-generated point cloud (hex-mesh based) with interpolated variable values on the points.
Restart/continue files
Restart/continue files are no longer stored in the same folder as the main output, but have their own RECON folder.
Section average velocity
Added section average velocity to surface and flow rate probes, which allows for better understanding of the measured mass flow at a given location.
Walltime measurement interface
Revised walltime measurement interface
Source_nFX_environment.sh file
Enhancement of the source_nFX_environment.sh file to improve diagnostics in case of trouble.

Known Issues

Adhesion coefficient
Adhesion coefficient needs to be calibrated against experimental results or visually estimated.
Large negative pressures
Large negative pressures cannot be accurately handled by the current weakly compressible formulation without total particle volume preservation.

Resolved Issues

  • Improvements to the time step calculation when thermal transport is enabled.