【摘要】 本文首次以数值方法求得开闸式异重流前峰行进规律。数值求解基于重正化群(RNG) k-ε湍流应力封闭模式 ,能合理反映异重流的过渡性局部湍流特征 ,结果与实验相符 ,表明开闸式湍动异重流的前峰行进有两个阶段 ,先是坍塌段 ,峰速不变 ,后是自相似段 ,峰速随时间以— 1/3次方规律递减。更多还原

【Abstract】 The head front location as the function of time for the turbulent gravity current of lock release type was firstly derived by CFD approach in this paper. The adopted Renormalization Group (RNG) k ε model for Reynolds stress closure proved to be seccessful in characterizing the time dependant current with transitional and highly localized turbulence. Consistent with well known experimental observations, the numerical results show that the gravity current passes through two phases, an initial slumping phase in which the current head advances steadily, and a second self similar phase in which the front velocity decreases in the form of negative third power of the time after release. [WT5HZ]更多还原