I’m trying to calculate the absolute permeability on my sample following the instructions on the permeability.cpp tutorial. Everything runs well at the beginning, but the simulation never converges (I even tried to set-up my own convergence criterion).
Taking a closer look at the .vtks I noticed that there is very high velocity ‘currents’ where the outlet of the boundary condition is placed (Figure 1). I tried reducing the pressure gradient but the results look the same:
Thanks for your reply. I noticed that I was placing the density boundary conditions on top of my bounce back nodes, this was probably causing those ‘spurious’ currents. By leaving some blank nodes and placing the boundaries there, the problem converges.
hey,I also encuontered the same problem,I always thought I need reduce the pressure gradient to solve this problem.But it misconvergence until 20000 iterations.Could you tell me how to leave blank nodes in detail? My work is the soil pore.