Numerical Simulation and Experimental Study of Three-Dimensional Density-Stratified Flow

摘要

The numerical relationship between vertical turbulence P/S σ_(tz) turbulence and stratification feature parameters is established by analyzing the flux expression of turbulent stress/ flux algebraic mode. Corresponding density change rate parameters reflecting changes in temperature and sediment concentration are introduced to correct the vertical diffusion coefficient of turbulent. A three-dimensional turbulence model with multi-phase coupling of water flow, temperature and sediment is established on this basis. The established standard Johnson water channel model is adopted for experimental study on the density-stratified flow model of temperature and sediment concentration and the experimental results are compared with the calculation results of three-dimensional density-stratified flow mathematical model.