非对称体边界下三维紊流模型的建立和验证  

Establishment and Verification of Three-Dimensional Turbulence Model under Boundary of Asymmetric Body

作　　者：焦萱 邱勇 周鑫宇 吴锦钢 杨福 JIAO Xuan;QIU Yong;ZHOU Xinyu;WU Jingang;YANG Fu(College of Water Conservancy,Yunnan Agricultural University,Kunming Yunnan 650201,China)

机构地区：[1]云南农业大学水利学院,云南昆明650201

出　　处：《农业工程》2020年第6期71-77,共7页AGRICULTURAL ENGINEERING

基　　金：云南省教育厅科学研究基金(项目编号:2018Y068)。

摘　　要：对于斜向进水、侧向泄水条件下的圆形消力井,基于井内水流紊动射流分区的半经验公式法,可以对淹没射流条件下的水股作用力进行机理分析,并推导得出射流沿程最大流速及冲击区井壁时均作用力表达式,但尚不能完全揭示其内部复杂的紊动水力特性。利用紊流理论的数值模拟可以更好地描述圆形消力井流场内部各处的时均流及紊动特性:根据区域形状特点,对流场的空间域和时间域进行剖分离散,由不规则边界紊流Navier-Stokes方程掺气影响统计演化建立了三维封闭可求解雷诺应力方程组。基于实际工程的数值分析成果表明,三维紊流模型可行有效,能够用于非对称体边界条件下的空间流场计算。For circular stilling well with inclined inflow and lateral discharge conditions,based on semi-empirical formula method of turbulent jet division,mechanism of water force under submerged jet could be analyzed,and expressions of maximum velocity along jet and time-average force in impact area could be deduced,but complex turbulent flow characteristics could not be fully revealed.Numerical simulation based on turbulence theory could better describe time-averaged flow and turbulence characteristics in flow field of circular stilling well.According to region shape,spatial and time domain were dissected and separated,and three-dimensional closed solvable Reynolds stress equations were established from statistical evolution of turbulent N-S equation with irregular boundary.Results of analysis showed that the model was feasible and effective,which ccould provide reference for similar engineering design and optimization.

关 键 词：数理模型 三维紊流 非对称体边界 圆形消力井 

分 类 号：TV131.4[水利工程—水力学及河流动力学]