【摘要】 用格子Boltzmann方法计算来流为水平剪切流的方柱绕流问题,得到了在不同速度梯度条件下方柱绕流的流线和等涡线图.发现在圆柱尾部形成两排涡,当来流速度梯度较大时,两排涡有很大的不同.计算结果表明,用格子Boltzmann方法计算剪切流的方柱绕流问题是可行的,计算结果与理论分析相符.更多还原

【Abstract】 A numerical simulation on the flow past a square cylinder placed in parallel to shear flow was studied by means of lattice Boltzmann method.The flow was calculated for different velocity gradients,the streamlines and vorticity contours were obtained.Numerical results show two series of vortexes with different sizes.With the increase of the velocity gradient,the difference between the two series of vortexes appears more clearly.Numerical results are coincident with the theoretical analysis,it is identified that lattice Boltzmann method is suitable for simulating the shear flow past a square cylinder.更多还原