Time scale issues
I'm using the DesignSPHysics FreeCAD plugin to help with the case pre-processing.
The problem that I am trying to simulate is looking at hypervelocity (~25,000 km/h) impacts in space (like space, space - as in space debris hitting satellites and stuff).
I am trying to simulate 150 microseconds worth of time (150e-6 seconds) with a part time of 1.2 microseconds (1.2e-6 seconds).
When I enter this information in, and also set the inital and minimum timestep to be 1e-12 seconds (for both, respectively), the simulation stops nearly immediately and it thinks that it is complete.
However, if I scale everything up to "seconds" (i.e. 1 second = 1 microsecond), then everything runs ok.
Why is that?
What is the minimum timestep limit that's been hard coded into the programme that is preventing me to run with a timestep of 1e-12 seconds?
Your help is greatly appreciated.