Multi-scale hydro-morphodynamic modelling using mesh movement methods
Multi-scale hydro-morphodynamic modelling using mesh movement methods
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DOI：
10.1007/s13137-021-00191-1
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发表时间：
2021-12
期刊：
影响因子：
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通讯作者：
M. Clare;Joseph G. Wallwork;S. Kramer;H. Weller;C. Cotter
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文献类型：
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作者：
M. Clare;Joseph G. Wallwork;S. Kramer;H. Weller;C. Cotter
水地貌模型是保护海岸带的重要工具。这些模型可能需要分辨从亚米到数百公里的空间尺度，而且计算成本很高。在这项工作中，我们首次将网格移动方法应用于深度平均的水地貌模型，以解决这两个问题。网格移动方法特别适合于海岸问题，因为它们允许网格随着流动和形态结构的演变而移动。这一新能力是使用测试案例演示的，这些测试案例展示了复杂的水深变化和移动的干湿界面。为了能够模拟干湿地区的泥沙运动，作为这项工作的一部分，发展了一种新的守恒离散方法，以及泥沙滑动机制。对于所有的测试用例，我们演示了如何使用网格移动方法来减少离散化误差和计算成本。我们还表明，根据测试用例的物理特征，网格移动监控功能中的最优参数选择是相当可预测的，这有助于使用网格移动方法来解决进一步的问题。
Hydro-morphodynamic modelling is an important tool that can be used in the protection of coastal zones. The models can be required to resolve spatial scales ranging from sub-metre to hundreds of kilometres and are computationally expensive. In this work, we apply mesh movement methods to a depth-averaged hydro-morphodynamic model for the first time, in order to tackle both these issues. Mesh movement methods are particularly well-suited to coastal problems as they allow the mesh to move in response to evolving flow and morphology structures. This new capability is demonstrated using test cases that exhibit complex evolving bathymetries and have moving wet-dry interfaces. In order to be able to simulate sediment transport in wet-dry domains, a new conservative discretisation approach has been developed as part of this work, as well as a sediment slide mechanism. For all test cases, we demonstrate how mesh movement methods can be used to reduce discretisation error and computational cost. We also show that the optimum parameter choices in the mesh movement monitor functions are fairly predictable based upon the physical characteristics of the test case, facilitating the use of mesh movement methods on further problems.