New boundary conditions are available for the following types of particle reflections:
General reflection, where you can supply your own expressions for the particle
velocity after collision with a wall.
Pass through, which can be used on interior boundaries in conjunction with a
sticking probability or expression.
New variables have been added for the particle release time, particle stop time, and
particle status. This improves the handling of the particle tracing when remeshing
occurs. To activate these variables, set the Store particle status data option to On.