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

该项目的目的是开展合作联合研究，研究水对土壤的侵蚀，这是巴西和其他地方人为活动造成的主要威胁。这将通过更好地了解侵蚀的基本机制，通过使用开放源代码DualSPHysics的无网格计算方法平滑粒子流体力学(SPH)来模拟土壤侵蚀。DualSPhysitics代码是由曼彻斯特大学和西班牙维戈大学的成员开发的，作为EPSRC资助的项目的一部分，目的是模拟复杂的水动力学问题。在最近的一次工业资助案例奖中，曼彻斯特大学的研究人员将该代码扩展到模拟快速水流引起的沉积物冲刷。该多阶段模型在DualSP物理中实现，使用图形处理单元(GPU)来加速计算，使计算速度加快高达100，从而实现工业用途。然而，尽管该模型与可侵蚀床上三维溃坝的实验数据进行了对比验证，但还需要运行其他数值模拟来测试其他类型的土壤、条件和边界处理。这将是拟议的应用程序所必需的，并将扩展功能并提供一系列健壮的验证案例以供将来使用。随着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，DualSP物理学将被用来检查不同土壤性质以及一系列稳定和非稳定流动条件下的可蚀床面上的流动。这些实验的改进将在巴西进行。试验结果将被用来改进程序，使其能够以扩展和验证的方式模拟土壤侵蚀，并通过新的试验研究稳定流条件下的水槽试验、泥沙再循环、渗流破坏、液化和水射流开挖。

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.