Newton Fund: Numerical simulation of soil erosion using Smoothed Particle Hydrodynamics (SPH)

该项目的目的是开展合作性联合研究，以研究水对土壤的侵蚀，这是巴西和其他地方人类活动造成的一个主要威胁。通过使用开放源代码DualSPHysics，使用无网格计算方法光滑粒子流体动力学（SPH）模拟土壤侵蚀，更好地了解侵蚀的基本机制。DualSphysics代码由曼彻斯特大学和维戈大学（西班牙）的成员开发，作为EPSRC资助项目的一部分，旨在模拟复杂的流体动力学问题。在最近的一项工业资助的CASE奖中，曼彻斯特大学的研究人员扩展了该代码，以模拟快速流动引起的沉积物冲刷。多阶段模型在DualSPHysics中使用图形处理单元（GPU）实现，以加速计算，加速高达100，从而实现工业用途。然而，虽然该模型与实验数据的3-D溃坝在可侵蚀的床，其他的数值模拟需要运行测试其他类型的土壤，条件和边界处理进行了验证。这对于拟议的应用程序是必要的，将扩展功能并为未来使用提供一系列强大的验证案例。通过巴西利亚大学和曼彻斯特大学之间的互访，这个为期6个月的项目将探索建立土壤侵蚀模型的潜力，为未来的发展和合作制定战略。在曼彻斯特，DualSPHysics将用于检查不同土壤特性以及一系列稳定和非稳定流动条件下的可侵蚀床上的流动。将在巴西对实验进行改进。实验结果将用于完善代码，并使其能够模拟土壤侵蚀的扩展和验证的方式与新的实验调查水槽试验下稳定的流动条件下，沉积物再循环，渗透破坏，液化和挖掘水射流。

The aim of this project is to develop collaborative joint research to study erosion of soils by water, which is a major threat caused by anthropogenic activity in Brasil and elsewhere. This will be achieved by gaining a better understanding on the basic mechanisms of erosion by means of simulating soil erosion with the meshless computational method Smoothed Particle Hydrodynamics (SPH) using the open-source code DualSPHysics.The DualSphysics code is developed by members of the University of Manchester and the University of Vigo (Spain) as part of EPSRC-funded projects with the purpose of modelling complex hydrodynamic problems. In a recent industrially funded CASE award, the code has been extended by researchers from the University of Manchester to model sediment scouring induced by rapid flows. The multi-phase model is implemented in DualSPHysics using Graphic Processing Units (GPUs) to accelerate the computations with speed-ups of up to 100 enabling industrial use. However, although the model was validated comparing with experimental data for a 3-D dam break over an erodible bed, other numerical simulations need to be run to test other types of soils, conditions and boundary treatments. This will be necessary for the proposed application and will extend both the functionality and provide a robust range of validation cases for future use. With exchange visits between the University of Brasilia and the University of Manchester, the 6-month project will explore the potential for modelling soil erosion developing strategies for future development and collaboration. In Manchester, DualSPHysics will be used to examine flows over an erodible bed for different soil properties as well as a range of steady and unsteady flow conditions. Improvements in the experiments will be performed in Brazil. The experimental results will be used to refine the code and to make it capable to model soil erosion in an extended and validated manner with new experiments investigating flume tests under steady flow conditions, sediment recirculation, seepage failure, liquefaction and excavation by a water jet.