General integral model for a jet in wavy current environment
General integral model for a jet in wavy current environment
复制标题
DOI：
10.1016/j.apm.2022.11.003
复制
发表时间：
2022-11
影响因子：
5
通讯作者：
Shuqiao Fang;Yongping Chen;Weiyong Shi;Zhenshan Xu;Xue-jun Xu;Qin Ye
中科院分区：
文献类型：
--
作者：
Shuqiao Fang;Yongping Chen;Weiyong Shi;Zhenshan Xu;Xue-jun Xu;Qin Ye
在沿海动态环境中，以射流形式排放的淹没污水的混合和扩散的模拟和预测的整体模型仍然缺乏在文献中。在这项研究中，一个通用的积分模型，模拟和预测的运动和稀释过程中的射流在静水，水流，波浪和波浪流环境。从基本的Navier-Stokes方程出发，结合质量守恒方程和标量守恒方程，推导了运动方程以及质量、动量、浮力和标量的控制方程。此外，该模型采用了夹带关闭的方法，区分横向和方位角剪切机制的贡献，并包含一个二次律湍流阻力机制。与静水、海流、波浪和波浪流环境中射流的基本实验数据的比较支持卷吸公式中所含卷吸系数的选择和大小以及拖曳力公式中所含拖曳力系数的统一计算公式。该模型的适用范围进行了仔细评估，并提出了几个模型的限制，超过该积分模型变得无效。一般的积分模型提供了一个可靠的技术方法来研究的运动和稀释过程中的射流在波浪流环境中，并可用于研究的影响，波浪和潮流的射流为更广泛的源和环境条件比迄今为止的实验研究。
An integral model for the simulation and prediction of the mixing and diffusion of submerged wastewater discharge in the form of a jet flow in a coastal dynamic environment is still lacking in the literature. In this study, a general integral model was developed to simulate and predict the movement and dilution process of jets in still water, currents, waves, and wavy current environments. Specifically, starting from the fundamental Navier–Stokes equations combined with the conservation equations of mass and scalar quantities, the equations of movement and the governing equations of mass, momentum, buoyancy, and scalar quantities were derived. Furthermore, the model employs an entrainment closure approach that distinguishes the contribution of transverse and azimuthal shear mechanisms and contains a quadratic-law turbulent drag force mechanism. A comparison with the basic experimental data for jets in still water, currents, waves, and wavy current environments supports the choice and magnitude of the entrainment coefficients contained in the entrainment formulation as well as the unified calculation formula of the drag force coefficient contained in the drag force formulation. The range of applicability of the model is carefully evaluated, and several model limitations, beyond which the integral model becomes invalid, are proposed. The general integral model provides a reliable technical approach to studying the movement and dilution process of jets in a wavy current environment and may be used to study the effects of waves and tidal currents on jets for a much wider range of source and ambient conditions than have been studied experimentally thus far.