After processing my fist from scratch, there are many things I can do with this mesh shown in Fig. 1. Using OpenFOAM or LBM code to do computational fluid dynamics is one option. By using OpenFOAM alone, there are many things I can play with, including numerical scheme, boundary condition, computational usage, etc… Also, the difference between the finite volume method, which is the fundament of OpenFOAM, and the lattice Boltzmann methods (LBM).