Fast spectral solutions of the double-gyre problem in a turbulent flow regime
Fast spectral solutions of the double-gyre problem in a turbulent flow regime
复制标题
DOI：
10.1016/j.apm.2018.09.026
复制
发表时间：
2019-02
影响因子：
5
通讯作者：
S. E. Naghibi;S. Karabasov;M. A. Jalali;S. Sadati
中科院分区：
文献类型：
--
作者：
S. E. Naghibi;S. Karabasov;M. A. Jalali;S. Sadati
几个半解析模型被认为是在湍流状态下的双涡旋问题的参考全数值涡解决方案。半解析模型对应于使用谱Galerkin方法求解深度平均Navier-Stokes方程。本文研究了线性和Smagorinsky涡粘性模型在湍流扩散近似中的稳健性。为了捕捉基本属性的双涡旋配置，如积分动能，积分角动量，和射流平均流量分布，一个改进的半解析模型，建议的灵感来自于规模分解的想法之间的射流和周围的流。
Several semi-analytical models are considered for a double-gyre problem in a turbulent flow regime for which a reference fully numerical eddy-resolving solution is obtained. The semi-analytical models correspond to solving the depth-averaged Navier–Stokes equations using the spectral Galerkin approach. The robustness of the linear and Smagorinsky eddy-viscosity models for turbulent diffusion approximation is investigated. To capture essential properties of the double-gyre configuration, such as the integral kinetic energy, the integral angular momentum, and the jet mean-flow distribution, an improved semi-analytical model is suggested that is inspired by the idea of scale decomposition between the jet and the surrounding flow.