基于WMLES方法的复式断面明渠三维紊流数值模拟  

A three-dimensional numerical simulation based on WMLES for compound open-channel turbulent flows

作　　者：曾诚[1] 丁少伟 周婕 王玲玲[1] 陈辰 ZENG Cheng;DING Shaowei;ZHOU Jie;WANG Lingling;CHEN Chen(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;College of Mechanics and Materials,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]河海大学力学与材料学院,江苏南京210098

出　　处：《水利水电科技进展》2020年第6期17-22,共6页Advances in Science and Technology of Water Resources

基　　金：国家重点研发计划(2017YFC0405605);中央高校基本科研业务费专项(B200202116,B200204044);国家自然科学基金(51879086);江苏省高校科技创新团队资助项目。

摘　　要：针对基于雷诺时均Navier-Stokes方程的数值模型在精确模拟复式断面明渠三维水流结构方面存在困难和传统大涡模拟(LES)方法计算成本相对较高的问题,采用壁面建模的大涡模拟(WMLES)方法建立三维数值模型,对水深比(滩地水深与主槽水深之比)为0.5的复式断面明渠水流结构进行模拟计算。数值模拟计算结果与已有试验测量结果和LES模拟结果的对比表明,WMLES方法能够准确地模拟时均速度、床面切应力、紊动强度、紊动能、雷诺应力分布、二次漩涡结构,该方法在复式断面明渠水流三维模拟中是可靠的;在保证计算精度的前提下,与传统LES方法相比,采用WMLES方法能够显著降低计算成本。Because the facts that numerical models based on Reynolds averaged Navier-Stokes equations cannot accurately simulate the 3D flow structures of compound open-channel flows and the high computational cost of traditional large eddy simulation(LES)method,a three-dimensional numerical model with wall-modelled large eddy simulation(WMLES)was developed to simulate the flow structure in a compound open-channel flow with a depth ratio of 0.5 in the present study.The numerical model was verified against the detailed experimental data of Tominaga et al.and the existing results of LES.The results show that the model with WMLES is accurate in the simulation of mean velocities,bed shear stress,turbulence intensities,turbulent energy,Reynolds stresses and secondary currents.The model is reliable in 3D numerical simulations of compound open-channel flows.Comparing to the traditional LES method,the WMLES method is able to significantly reduce the computational cost.

关 键 词：WMLES 复式断面明渠 数值模型 二次流 雷诺应力 

分 类 号：TV131.2[水利工程—水力学及河流动力学]