基于能量比系数的圆柱栅绕流LES方法研究
发布时间：2019-05-10 09:47
【摘要】：圆柱阵列流场不但是工程上常见的流动换热结构,而且绕流问题与湍流涡发展研究密切相关。该文采用数值模拟算法研究了不同雷诺数下的单列圆柱栅绕流的不可压缩流动。比较了非定常RANS方程计算得到的湍动能和耗散率,引入湍流能量比系数对初始计算网格进行重新划分和局部加密,进而建立适宜于大涡模拟网格尺度,其结果与PIV和RANS结果进行对比。结果表明,在湍流流场区域能量比系数达到30%-40%的情况下,就可得到工程实际需要的精确计算结果,这大大减少LES算法所需要的计算网格总数和时间。
[Abstract]:The flow field of cylindrical array is not only a common flow heat transfer structure in engineering, but also closely related to the development of turbulent vortexes. In this paper, the incompressible flow around a single column cylindrical gate with different Reynolds numbers is studied by numerical simulation algorithm. The turbulent kinetic energy and dissipation rate calculated by the unsteady RANS equation are compared. The turbulent energy ratio coefficient is introduced to redivide and encrypt the initial computational grid, and then the grid scale suitable for large vortex simulation is established. The results were compared with those of PIV and RANS. The results show that when the energy ratio coefficient of turbulent flow field reaches 30% 鈮，
本文编号：2473554
[Abstract]:The flow field of cylindrical array is not only a common flow heat transfer structure in engineering, but also closely related to the development of turbulent vortexes. In this paper, the incompressible flow around a single column cylindrical gate with different Reynolds numbers is studied by numerical simulation algorithm. The turbulent kinetic energy and dissipation rate calculated by the unsteady RANS equation are compared. The turbulent energy ratio coefficient is introduced to redivide and encrypt the initial computational grid, and then the grid scale suitable for large vortex simulation is established. The results were compared with those of PIV and RANS. The results show that when the energy ratio coefficient of turbulent flow field reaches 30% 鈮，
本文编号：2473554
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