**4. The grid independence and validation**

For the validation of the current CFD code based on LBM, the aerodynamic force and moment coefficients are calculated to compare with the experimental wind tunnel works from EN 14067-6:2010, which is performed by Schober et al. [25]. **Table 2** shows the comparison of the aerodynamic coefficient by present code and the standard data. The high-speed train model with no barrier is tested and the drag, lift, and rolling moment coefficients have been calculated for comparison. It is clear to see that the disparity is acceptable, which validated the present code and results.


**Table 2.**

*Verification with the standard EN 14067-6: 2010.*
