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依托动网格技术,并采用局部节点位移方式,研究城市道路方案分别为重型商用车经过位于其背风侧的单个建筑物、经过位于其迎风侧的单个建筑物和连续经过位于其迎风侧的2个建筑物3种情况下的瞬态气动特性.方案中网格节点位移速度即重型商用车行驶速度定为15 m/s,侧风速度为10 m/s.结果 显示,建筑物对重型商用车瞬态气动特性的影响较为明显,行驶过程中侧向力系数与横摆力矩系数在1s内变化值达到5.0之多,相应的侧向力和横摆力矩变化值约为12 kN和30 kN·m,变化率峰值可达-12 kN·s1和35 kN·m·s-1,并且方向在行驶过程中发生改变.“,”Based on the dynamic meshing technology,and adopting the partial joints displacement mode,the transient aerodynamic characteristics of three schemes that the heavy commercial vehicle passing the leeward side of single building,passing the windward side of single building and passing the windward side of double buildings about urban roads were studied.The displacement velocity of the mesh joint,namely the driving velocity of heavy commercial vehicle,was set at 15 m/s,and the velocity of the crosswind was 10 m/s.The results show that the effects of buildings on the transient aerodynamic characteristics are relatively obvious.During the driving,the change values of lateral force coefficient and yawing moment coefficient can be up to more than 5.0 in one second.And the corresponding change values of lateral force and yawing moment are about 12 kN and 30 kN · m,which make the peak change rates of lateral force and yawing moment reach to-12 kN · s-1and 35 kN · m · s-1.In addition,the direction of these two parameters have changed twice during the driving process.