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采用正交曲线坐标下建立的紊流控制方程,对弯道水流中由离心力和紊动应力联合驱动的二次流结构建立了数学模型.将螺旋下降的明渠流动条件下的数值模拟结果与如下试验资料进行了对比:(i)交错边滩式矩形断面弯道明渠流动,(ii)复式断面顺直明渠流动.计算中采用了3种不同的Reynolds应力计算方法,包括Launder和Ying(LY)及Naot和Rodi(NR)的代数应力模型及运用非线性κ-ε模型计算紊动黏性系数的SY模型,在各种弯道曲率和边界条件下,对不同紊流模型的二次流结构数值模拟结果精度进行了评估.研究表明,LY和SY模型数值模拟计算得到的二次流结构和紊动应力分布与试验数据均能达到趋势上的符合,能够模拟出紊动应力和弯道流动中的离心力对二次流结构形成的影响.
The mathematical model of the secondary flow structure driven by centrifugal force and turbulent stress in the curve flow is established by using the turbulence control equation established under the orthogonal curvilinear coordinates.The numerical simulation results under the condition of the spirally falling open channel flow are as follows The experimental data are contrasted: (i) three-dimensional Reynolds stress calculation using three different Reynolds stress calculations including (i) staggered open-ended curved open channel flows, and (ii) And algebraic stress model of Naot and Rodi (NR), and the SY model for calculating the coefficient of turbulent viscosity using the nonlinear κ-ε model, the secondary flow structures of different turbulence models under different curve curvature and boundary conditions The results show that the secondary flow structure and turbulent stress distribution calculated by LY and SY models agree well with the experimental data, which can simulate the effects of turbulent stress and curve flow Influence of Centrifugal Force on Secondary Flow Structure Formation.