WINDBREAK PERFORMANCE OF WIND FENCE ON HIGH SPEED TRAIN BASED ON NUMERICAL SIMULATION

The windbreak performance of the wind fence on a high speed train is investigated by CFD numerical simulation method. Firstly, a wind fence is equivalent to porous media and the additional source method is explored to simulate its windbreak performance. By comparing of the results drawn from simulation and wind tunnel tests, the provided method is validated. Based on the given method, the windbreak performance of a wind fence with different porosity is investigated, the results show that optimal porosity is 40%. The aerodynamic forces of a train are simulated by the moving grid method, which agree with the results drawn from the site measurement. Finally, the safety of a high speed train is evaluated in the action of across wind. The results show that a wind fence can improve the efficiency of a train.