Abstract
A 3D numerical model named NEWTANK is employed to investigate the flow motion and sediment transport in grouped spur dikes system. This model is based on the Navier-Stokes equations, adopting the Volume of Fluid (VOF) method to track the free surface motion, while the solid is described by using the Porous Media Method (PMM). The Large Eddy Simulation (LES) is applied to capture turbulence. In sediment calculation parts, the suspended load and bedload are treated separately but combined together to update bed variation eventually. The finite difference form and Two-step Projection Method are employed in the process of discretizing the governing equation. Several carefully selected flume experiments are introduced to verify this model's reliability before its application on the simulation of grouped spur dike case, and detailed flow characteristics and sediment properties are analyzed afterwards.
Highlights
The spur dikes, which are known as groynes are kinds of very common hydraulic structures in river engineering, especially on some big rivers such as Mississippi River, Rhine River and Yellow River
Flow separation and circumfluence behind the spur dikes result in strongly 3D turbulence, while the pressure distribution is non-hydrostatic, which are directly related to the sediment transport and local scour around the spur dike, and the eventual balance are reached as flow and sediment strongly coupled with each other
For the aspect of numerical simulation, Peng et al [27,28] used a 3D numerical model with k-ε turbulence module to study the flow structure in a double spur dikes system based on their work on isolated spur dike case before
Summary
The spur dikes, which are known as groynes are kinds of very common hydraulic structures in river engineering, especially on some big rivers such as Mississippi River, Rhine River and Yellow River. Since 1960s, the flow motion and sediment transport around the spur dikes have become a hot research issue which attracts many scholars and engineers to contribute their passion and energy. It is more common that the spur dikes are constructed as the grouped spur dikes system in engineering application, and in the grouped spur dike systems, the motion of flow and sediment would be more complicated because of the interaction between the spur dikes These achievements on isolated spur dike case can provide fairly useful references, but studying the phenomenon of fluid motion and sediment transport in grouped spur dikes system is still needed. Here we illustrate an application of a fully 3D numerical model combined with the LES scheme and porous media method (PMM) on fluid motion of grouped spur dikes problems involving local scour and sediment moving. We introduce the model, and present verification against laboratory experiments to verify this model’s reliability, afterwards, this model is applied to investigate concerned hydrodynamic process and sediment transport phenomenon while some detailed analyses will be conducted
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