The two things we will check for verification are the mass conservation and inlet boundary conditions. We will check the inlet boundary conditions to ensure that the UDF is doing what we expected it to. Then, we will do a mesh refinement and use a smaller time-step to check whether the results are consistent with the original calculation. By using a finer mesh and a smaller time-step, we will investigate the effects of truncation error caused by spatial discretization and temporal discretization. Then we will do a case comparison for the results obtained after spatial and temporal refinement.