线性剪切来流对方柱绕流特性影响的数值分析

发布时间：2018-01-06 01:35

  本文关键词：线性剪切来流对方柱绕流特性影响的数值分析　出处：《水利水电科技进展》2017年01期 　论文类型：期刊论文

  更多相关文章： 线性剪切来流 方柱绕流 特征线算子分裂有限元法 剪切参数 流场结构

【摘要】：为研究线性剪切来流对方柱绕流特性的影响,将对流出口边界条件引入特征线算子分裂有限元法中,建立了线性剪切来流的方柱绕流数值模型,并采用均匀来流的方柱绕流模拟结果验证了该模型计算方柱绕流问题的可靠性。数值模拟结果表明,剪切参数k对方柱绕流尾部形成的两排涡影响明显,涡脱落在k较大时被抑制,在k≥0.4时涡量最终形成一个类似三角形的区域;驻点随k的增加逐渐向高速侧分离点移动,在k≥0.3时驻点的位置不再发生变化;平均阻力系数在0.2≤k≤0.25时发生较大变化,平均升力系数在k≥0.2时为负。
[Abstract]:In order to study the effect of linear shear flow on the flow around a cylinder, the convection exit boundary condition is introduced into the characteristic line operator splitting finite element method, and a numerical model of linear shear flow around a square cylinder is established. The simulation results of uniform flow around a square cylinder verify the reliability of the model in calculating the flow around a square cylinder. The numerical simulation results show that two rows of vortices formed at the tail of the shear parameter k are obviously affected by the flow around the cylinder. The vortex shedding is suppressed when k is larger, and when k 鈮，

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