In order to minimize the accumulated calculation errors and obtain more accurate scaling factor, a prior detailed mesh size effect has been particularly studied and analyzed. All the mesh convergence studies have focused on the parallel gauge length regions to obtain good resolution in terms of average distribution. Four types of mesh strategies are applied with varying mesh sizes from coarser (0.2 mm) to finer (0.05 mm) in the width direction. The results indicate that if the mesh is fine enough, the average responses can be supposed to be almost independent of element size. In the aforementioned numerical simulation, due to computational costs, a fixed element size of ~ 0.1 mm has been chosen for meshing the parallel gauge length area.