摘要
分离涡数值模拟方法(DES)在物面附近求解雷诺平均Navier-Stokes方程,在其他区域采用大涡模拟方法。兼具前者计算量小的优点和后者能模拟大分离湍流流动、计算精度高的优势。采用基于剪切应力传输(SST)两方程湍流模型的DES方法对粘性不可压缩流体的圆柱绕流问题进行数值模拟。通过对所得的速度场、压力场、阻力系数Cd、升力系数Cl、斯特罗哈数St等结果的分析及与文献上的实验和计算数据的比较,说明DES方法对于层流及高亚临界雷诺数的圆柱绕流模拟是合理的。
DES （Detached Eddy Simulation） method has a main idea as that RANS turbulence model is used near the wall and LES method is used in the other region of the field. So DES method is a hybrid turbulence modeling method which unites the efficiency of RANS and the accuracy of LES into one framework. In this paper,DES method based on SST two-equation turbulence model is used to simulate the incompressible viscous flow around a circular cylinder. The calculated results agree well with experimental data and other numerical results, which prove that DES method is valid and credible to simulate flow around a circular cylinder with low or higher sub-critical Reynolds number.
出处
《舰船科学技术》
2009年第2期30-33,共4页
Ship Science and Technology
关键词
圆柱绕流
分离涡模拟
雷诺数
涡街
水动力特性
flow around a cylinder
detached eddy simulation
Reynolds number
Vortex Street
hydrodynamic characteristics
