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Numerical model on the flow dynamics around the sediment-water interface in the tidal coastal area

机译：潮汐沿海地区沉积物-水界面周围流动动力学的数值模型

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Investigating flow dynamics around the sediment-water interface is one of difficult issues in marine environment. It has important significance to study the physical, chemical and biological activities between the overlying water and sedimentary layer with tidal forcing. In this study, we established a numerical model to investigate the flow dynamics around the sediment-water interface in the tidal coastal area. The model reflected the hydrodynamics of periodic reciprocating unsteady flow in the overlying water layer and the fully coupled simulation of flow movement between the overlying water layer and sedimentary layer. A sedimentary layer, an overlying water layer, and an air layer were all treated as the fluid zone. The unsteady Reynolds-averaged Navier-Stokes equations, and the Reynolds stress model with porosity, were solved by the finite volume method. Moreover, the drag source term in the momentum equation was modified as the Darcy-Forchheimer extended form. The model showed a strong performance in simulating the hydrodynamics of coupled flow around the sediment-water interface with tidal forcing in a coastal area. With considering the sedimentary layer, the benthic boundary layer velocity distributions were more accurate than those obtained by a wall function model. Around the sediment-water interface, there was inertial loss in the flow. Furthermore, velocity increased with increasing porosity, and velocity gradient became larger. Compared with models with Darcy's Law, the numerical model in this study had better performance in the turbulent characteristics of sediment water interface layer. The model can lead to better understanding of the exchange mechanisms of oxygen, nitrogen and nutrient between overlying water and sediment. (C) 2017 Elsevier Ltd. All rights reserved.
机译：研究沉积物-水界面周围的水流动力学是海洋环境中的难题之一。研究潮汐作用下上覆水与沉积层之间的物理，化学和生物活动具有重要意义。在这项研究中，我们建立了一个数值模型来研究潮汐沿海地区沉积物-水界面周围的水流动力学。该模型反映了上覆水层中周期性往复非定常流动的流体力学以及上覆水层与沉积层之间流动的完全耦合模拟。沉积层，上覆水层和空气层均被视为流体带。用有限体积法求解了非稳态的雷诺平均Navier-Stokes方程，以及带孔隙的雷诺应力模型。此外，动量方程中的阻力源项已​​修改为Darcy-Forchheimer扩展形式。该模型在模拟沿海岸带潮汐强迫作用下的沉积物-水界面周围的耦合流动的水动力方面表现出强大的性能。考虑到沉积层，底栖边界层的速度分布比壁函数模型获得的更为精确。在沉积物-水界面周围，流中存在惯性损失。此外，速度随着孔隙度的增加而增加，并且速度梯度变大。与达西定律模型相比，本研究的数值模型在沉积物水界面层的湍流特性方面具有更好的性能。该模型可以使人们更好地了解上覆水和沉积物之间的氧，氮和养分交换机制。 （C）2017 Elsevier Ltd.保留所有权利。

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