Reply To: Low Re flow inside Microchannel
In order to investigate the failing assertion: Can you compile the program in debug mode and start it in a debugger to obtain a backtrace? (e.g., in case this is unfamiliar: gdb ./cylinder3d and type bt once it crashed)
1: There likely is more than one possible set of unit conversion parameters that fit your model. How did you decide on the relaxation time? How is the unit converter set up / fixing which parameters?
2: Looking at your geometry your resolution requirement is correct. (Your N is relative to which physical length? For a first test it should be sufficient to chose e.g. some low multiple of 10 cells to discretize a 3 micron wide cylinder)