不同湍流模型模拟近岸潮流差异性比较  

Comparison of differences in simulating nearshore currents with different turbulence models

作　　者：郝嘉凌[1] 刘镇 胡春也 HAO Jia-ling;LIU Zhen;HU Chun-ye(College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing,Jiangsu 210098,China)

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098

出　　处：《中国港湾建设》2022年第1期1-6,共6页China Harbour Engineering

基　　金：国家自然科学基金联合基金项目(U2040203)。

摘　　要：近岸水流垂向的结构及特性对研究物质输运具有重要意义。为准确而简便地模拟近岸水流的相关特征值,选取3种适用于计算高雷诺数湍流的湍流模型,Standard k-ε模型、RNGk-ε模型和Realizable k-ε,采用标准壁面函数方法处理低雷诺数区域湍流,采用理论上无条件稳定的Crank-Nicolson时间积分方案对输运方程求解。通过对Menai海峡水流进行了一维垂向数值模拟,将水流各特征值的模拟结果与实测数据比较分析表明,3种k-ε模型用于近岸水流数值模拟具有一定的准确性和适用性。对于恒定流和潮流两种不同的水流情况,3种模型模拟的差异不同;在同为潮流条件下,不同的k-ε模型在计算精度、捕捉特征值剖面变化特性等方面存在差异,可为近岸区域流场的模拟研究提供参考。The vertical structure and characteristics of nearshore flow are of great significance to the study of material transport.In order to accurately and simply simulate the relevant eigenvalues of offshore flow,three kinds of turbulence models,Standard k-ε model,RNG k-ε model and Realizable k-ε model,which are suitable for the calculation of high Reynolds number turbulence,were selected in this paper.Standard wall function method was used to deal with the turbulence in the region with low Reynolds number.The transport equation was solved by using a theoretically unconditionally stable Crank-Nicolson time integral scheme.Through the one-dimensional vertical numerical simulation of the flow in Menai Strait,the simulation results of the characteristic values of the flow are compared with the measured data.The results show that the three kinds of k-ε models have great accuracy and applicability for the numerical simulation of the nearshore flow.For different flow conditions of steady flow and tidal current,the simulation effect of the three models is different.For the same tidal current condition,different k-ε models have different calculation accuracy and capture characteristic profile variation characteristics,which can provide a reference for the simulation research of nearshore area flow field.

关 键 词：近岸水流 一维垂向 k-ε模型 数值模拟 

分 类 号：U652.7[交通运输工程—港口、海岸及近海工程] P731.2[交通运输工程—船舶与海洋工程]