【摘要】 采用标准k-ε湍流模型,对纵向旋涡发生器(longitudinal vortex generator)引起的流场扰动进行了并行数值模拟.控制方程使用有限元法离散,采用改进的Uzawa法将速度与压强耦合,网格划分使用了非结构化网格技术.计算得到空气绕过旋涡发生器后产生了一对下洗纵向涡,动量的输运使得涡间壁面边界层变薄,而旋涡外侧边界层变厚.随着流动向下游发展,涡的强度不断变小,但涡形在很远的地方依然存在.将计算所得旋涡发生器后两个横断面上的流向和纵向速度与试验数据进行对比,结果表明,在近壁处计算结果与试验结果吻合良好,标准k-ε模型基本能够模拟旋涡发生器引起的三维湍流流动.更多还原

【Abstract】 Using the Reynolds averaged Navier-Stokes equations and the standard k-ε turbulence model,numerical simulations based on parallel computation were performed for three-dimensional turbulent flows containing longitudinal vortex pairs.The N-S equations were discretized by finite element method.The unstructured grid method was used to generate mesh.Characteristics of 3D velocity field were discussed.The numerical results of the mean-flow velocity were compared with the corresponding measurement data and good agreement was obtained.The results verify that the standard k-ε model can basically simulate the 3-D turbulent flow introduced by vortex generators.更多还原