摘要
采用基于非结构化网格的有限体积法离散控制方程和湍流模式,应用SI MPLE(semi-i mplicit method for pressure linked equations)方法处理速度-压力耦合,对流项和非定常项分别采用二阶迎风格式和二阶精度离散,隐式迭代求解方程组。基于SA和SST的DES模型,得到了不同攻角下粘性流场和水动力的数值计算结果,包括阻力系数、升力系数和力矩系数等随攻角的变化情况,并与国外实验结果进行了比较。结果表明:两种模式都能够反映流场的粘性分离特性,特别是基于SA的DES模型更接近实验值;SA湍流模式Cυ参数和时间步长Δt对数值计算结果是有影响的,因此对两者的合适选择是有必要的。
DES methods based on some typical turbulence models were used to simulate the separated flow around a 6∶1 ellipsoid.A finite volume method was based on unstructured meshes for governing equations and turbulence models.SIMPLE（semi-implicit method for pressure linked equations） algorithm was used to handle the velocity-pressure coupling.With SOU（second order upwind） scheme used for convective term,the flow fields and hydrodynamic forces at different incidence angles were computed.The computed results were compared with experimental ones presented in the published papers.The effect of the value of Cv in the SA model and time steps on the computational results were also analyzed.
出处
《海军工程大学学报》
CAS
北大核心
2011年第1期100-103,共4页
Journal of Naval University of Engineering
关键词
有限体积法
椭球体
非结构化网格
湍流模式
水动力
finite volume method
prolate spheroid
unstructured meshes
turbulence model
hydrodynamic force
