潮汐环境中垂向湍射流流场的数值模拟

Numerical Simulation for the Velocity Field of Vertical Jet Discharging into Tidal Environment

选用k-(?)双方程湍流模式,对自由面做“动”刚盖假设,建立潮汐流场中垂向射流流场的数学模型.根据潮流往复回荡的特性,采用“跟踪扫描”对离散方程逐行求解,保证和加快了解的收敛。计算了五种回荡周期中射流流场的变化过程,预报回流区高度与实测值吻合。分析了潮汐非恒定性的影响,获得了一些有益结论。

A mathematical model for the velocity field of vertical jet discharging into tidal flows is presented, in which the K-ε turbulent model is adopted for turbulence and the 'motion'-rigid-lid approximation of the free surface is described. According to the oscillation feature of tide, a track-while-scan line by line method for solution of the dis-cretized equations is developed. Numerical calculations are done on the unsteady velocity fields in different periodical cases. The predicted relative height of the major recirculation region is in good agreement with the experiment date. Hence, the effect of unsteadiness is also discussed and some conclusion remarks are given.