基于能量比系數(shù)的圓柱柵繞流LES方法研究
發(fā)布時間：2019-05-10 09:47
【摘要】：圓柱陣列流場不但是工程上常見的流動換熱結構,而且繞流問題與湍流渦發(fā)展研究密切相關。該文采用數(shù)值模擬算法研究了不同雷諾數(shù)下的單列圓柱柵繞流的不可壓縮流動。比較了非定常RANS方程計算得到的湍動能和耗散率,引入湍流能量比系數(shù)對初始計算網格進行重新劃分和局部加密,進而建立適宜于大渦模擬網格尺度,其結果與PIV和RANS結果進行對比。結果表明,在湍流流場區(qū)域能量比系數(shù)達到30%-40%的情況下,就可得到工程實際需要的精確計算結果,這大大減少LES算法所需要的計算網格總數(shù)和時間。
[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，
本文編號：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，
本文編號：2473554
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