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A Comparison Between Weakly-Compressible Smoothed Particle Hydrodynamics (WCSPH) and Moving Particle Semi-Implicit (MPS) Methods for 3D Dam-Break Flows
International Journal of Computational Methods ( IF 1.7 ) Pub Date : 2020-08-16 , DOI: 10.1142/s021987622050036x
Rubens A. Amaro Junior 1 , Liang-Yee Cheng 2 , Sergei K. Buruchenko 2
Affiliation  

Lagrangian particle-based methods have opened new perspectives for the investigation of complex problems with large free-surface deformation. Some well-known particle-based methods adopted to solve non-linear hydrodynamics problems are the smoothed parti- cle hydrodynamics (SPH) and the moving particle semi-implicit (MPS). Both methods model the continuum by a system of Lagrangian particles (points), but adopting distinct approaches for the numerical operators, pressure calculation, and boundary conditions. Despite the ability of the particle-based methods in modeling highly nonlinear hydrodynamics, some shortcomings, such as unstable pressure computation and high computational cost remain. In order to assess the performance of these two methods, the weakly-compressible SPH (WCSPH) parallel solver, DualSPHysics, and an in-house incompressible MPS solver are adopted in this work. Two test cases consisting of three-dimensional (3D) dam-break problems are simulated, and wave heights, pressures and forces are compared with the available experimental data. The influence of the artificial viscosity on the accuracy of WCSPH is investigated. Computational times of both solvers are also compared. Finally, the relative benefits of the methods for solving free-surface problems are discussed, therefore providing directions of their applicability.

中文翻译:

用于 3D 破坝流的弱可压缩平滑粒子流体动力学 (WCSPH) 和运动粒子半隐式 (MPS) 方法之间的比较

基于拉格朗日粒子的方法为研究具有大自由表面变形的复杂问题开辟了新的视角。用于解决非线性流体动力学问题的一些著名的基于粒子的方法是平滑粒子流体动力学(SPH)和运动粒子半隐式(MPS)。这两种方法都通过拉格朗日粒子(点)系统对连续体进行建模,但对数值算子、压力计算和边界条件采用不同的方法。尽管基于粒子的方法能够模拟高度非线性的流体动力学,但仍然存在一些缺点,例如压力计算不稳定和计算成本高。为了评估这两种方法的性能,弱可压缩 SPH (WCSPH) 并行求解器 DualSPHysics,并且在这项工作中采用了内部不可压缩的 MPS 求解器。模拟了两个由三维 (3D) 溃坝问题组成的测试案例,并将波高、压力和力与可用的实验数据进行了比较。研究了人工粘度对WCSPH精度的影响。还比较了两个求解器的计算时间。最后,讨论了解决自由表面问题的方法的相对优势,从而提供了它们的应用方向。还比较了两个求解器的计算时间。最后,讨论了解决自由表面问题的方法的相对优势,从而提供了它们的应用方向。还比较了两个求解器的计算时间。最后,讨论了解决自由表面问题的方法的相对优势,从而提供了它们的应用方向。
更新日期:2020-08-16
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