Reply To: HBLM for stokes drag force simulation
Dear Zhangshi,
for tau too close to 0.5 the simulation gets unstable, but a too large tau (depending on the case of application, e.g. tau=1) can lead to deviations from the physical setup.
You can apply no-slip boundaries, however the best results will be optained with a domain large enough. You might have to test that.
In your case epsilon is two orders of magnitude below the cell size physDeltaX. It will probably have almost no effect.
Best regards
Robin