Comparison of several turbulent models for calculating turbulent separated flows passing on sill
-
摘要: 利用标准模型κ-ε、重整群κ-ε模型和v2f三种不同的紊流模型,在同位网格系统基础上,采用了有限控制体积离散方程,数值模拟了底坎所形成紊流分离流。计算结果表明,所选用的3种模型虽大致都能模拟出底坎分离流的流动特性,如前后角涡、回流型态等,但在主涡心位置、回流长度、水头损失和流速分布等方面3种模型计算结果有所差异,其中v2f模型所计算的结果同试验和大涡模拟的结果值更趋一致。结果表明,v2f模型具有更精确模拟底坎所形成的紊流分离流方面的优势。Abstract: In this article, three turbulent models, namely the standard κ-ε model, the renormalization κ-ε model, and the v-f model, are adopted to calculate the turbulent separated flow passing on sill, based on the co-located grid system and the volume method.The results show that the three models can simulate the characteristics of the turbulent separated flow passing on sill, such as the front vortex and back vortex, the pattern of back flow, etc, but there are different in the profiles of velocity, the location of the vortex behind the sill, the length of back flow and the head loss among the models.Compared with the experimental data, the results of LES indicate that the results simulated by the v-f (κ-ε-ν2) model behave best among the three models.Therefore, the v-f (κ-ε-ν2) model has the predominance in the simulation in the turbulent separated flows.
-
[1] 华东水利学院编.抽水站[M].上海:上海科学技术出版社,1987.(Hohai University.Pumping sation[M].Shanghai:Shanghai Science and Technology Press,1987.(in Chinese)) [2] 冯旭松.泵站前池底坎整流及坎后流动分析[D].扬州:扬州大学,1996.(FENG Xu-song.Analysis of sill flows and in forebay of pumping station[D].Yangzhou:Yangzhou University,1996.(in Chinese)) [3] 徐辉.芙蓉江泵站蓄水池水力特性试验研究[R].南京:河海大学,2005.(XU Hui.Experimental study on hydraulic characteristics in forebay of Furong pumping station[R].Nanjing:Hohai University,2005.(in Chinese)) [4] LU June,WANG Ling-ling.Numerical study of large eddy structures-separated flows passing sills[C]∥16th congress of Asia and pacific division of international association of hydraulic engineering and research and 3th IAHR international symposium of hydraulic structures.Beijing:Tsinghua University,2008:1795-1799. [5] LAUNDER B E,SHARMA B I.Application of the energy dissipation model of turbulence to the calculation of flow near a spinning disc,Lett[J].Heat Mass Transfer,1974,1(1):131-138. [6] LAUNDER B E,SPALDING D B.Lectures in mathematical models of turbulence[M].London:Academic Press,1972. [7] WILCOX D C.Turbulence modelling for CFD,second edition[M].La Canada:DCW Industries,Inc,1994. [8] YAKHOT T V,ORSZAG S A.Renormalized group analysis of turbulence,I basic theory[J].Journal of Scientific Computing,1986,1(1):3-5. [9] YAKHO T V,ORSZAG S A,THANGAM S,et al.Development of turbulence models for shear flows by a double expansion technique[J].Phys F luids A,1992,4 (7):1510-1520. [10] BISWAS G,ESWARAN V.Turbulent flows[M].England:Alpha Science International LTD.2002. [11] DURBIN P A.Separated flow computations with the k-ε-v2 model[J].AIAA Journal,1995.33(4):659-664. [12] BEHNIA M,PARNEIX S,SHABANY Y,et al.Numerical study of turbulent heat transfer in confined and unconfined impinging jets[J].International Jounal of Heat and Fluid Flow,1999,20(1):1-9. [13] LIEN F S,GEORGI K.Computations of transonic flow with the v-f turbulence model[J].International Journal of Heat and Fluid Flow.2001,22(1):53-61. [14] ZHANG Zhao-shun,CUI Gui-xiang,et al.Theory and Modeling of Turbulence[M].Beijing:Tsinghua University,2006. [15] 陶文铨.数值传热学[M].西安:西安交通大学出版社,2001.(TAO Wen-quan.Numerical heat and transfer[M].Xi′an:Xi′an Jiaotong University Press.2001.(in Chinese)) -
点击查看大图
计量
- 文章访问数: 83
- HTML全文浏览量: 23
- PDF下载量: 584
- 被引次数: 0
下载:
