| Abstrakt: |
In this research, numerical simulations of the flow around the high-speed train with different fences are performed through the Lattice Boltzmann Method. The problems of how the multi-fences affect the aerodynamic loads coefficients of the high-speed train are focused. Six different fence arrangement strategies are considered, including the single, double, and three fences with different heights (1 and 2 m) introduced on the train's windward and leeward sides. The results have shown that the applied fences have a considerable impact on the aerodynamic characteristics around the train. When a single 2 m fence is used, the side force coefficient increases. But for the other fences, a decrease in side force coefficient can be obtained. All the fence strategies can achieve a reduction of the lift force coefficient significantly. Moreover, the force coefficients decrease by increasing the fence heights. When the three two-meter fences are placed, the decrement of side and lift force coefficient are 82.9 and 99.6%, respectively. However, for the moment coefficients, the increment of fence height leads to an increase in both the rolling moment coefficient and the lee-rail rolling moment coefficient. To obtain the least moment coefficients, the application of three one-meter fences is the best choice and the decrements are 67.6 and 72.5%, respectively. |
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