Reply To: Low Re flow inside Microchannel
By memory isses you mean that you run out of memory on the system? One possibility is that the domain decomposition doesn’t do what it should and you end up with large empty areas that nevertheless need to be allocated on the system (as OpenLB only offers blocks of directly addressed grids at this time). Whether this is the case here is hard to tell from the provided information.
In general, small characteristic lengths do not necessitate large resolutions as the characteristic length is only a parameter of the physical parametrization of which the actual lattice quantities are derived.