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基于多松弛格子Boltzmann方法的大涡模拟对雷诺数为194,旋转数从0～5.0的旋转槽道湍流进行数值模拟.采用动态亚格子应力模型模化滤波后的不封闭项,修正二阶矩作用力模型计算压力梯度、哥氏力.对平均速度、均方根脉动速度、雷诺应力以及湍流结构进行了计算.结果显示哥氏力使流场平均速度呈现不对称性:在压力面,随着旋转数的增加,湍流度增强;而在吸力面湍流脉动减弱,具有层流化的趋势.将格子Boltzmann模型与直接数值模拟求解进行对比,结果验证了格子Boltzmann方法在旋转湍流模拟中的可行性.
The large eddy simulation based on the multi-relaxation lattice Boltzmann method simulates the turbulent flow in a rotating channel with a Reynolds number of 194 and a rotation number of 0-5.0. The dynamic sub-lattice stress model is used to model the closed non-closed term and the second moment The pressure model and Coriolis force model were used to calculate the average velocity, root mean square velocity, Reynolds stress and turbulent structure.The results show that the Coriolis force makes the average velocity of the flow field asymmetric: on the pressure surface, The turbulence increases with the increase of the number of rotations and the turbulent pulsation weakens at the suction surface and tends to laminar flow.The lattice Boltzmann model is compared with the direct numerical simulation to verify that the Lattice Boltzmann method is feasible in the simulation of turbulent turbulence Sex.