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首页> 外文期刊>Journal of Computational Physics >Dual-criteria time stepping for weakly compressible smoothed particle hydrodynamics
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Dual-criteria time stepping for weakly compressible smoothed particle hydrodynamics

机译：弱可压缩平滑粒子动力学的双标准时间踩踏

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摘要

Implementing particle-interaction configuration, which consists of determining particle-neighbor lists and computing corresponding kernel weights and gradients, and time integration are performance intensive essentials of smoothed particle hydrodynamic (SPH) method. In this paper, a dual-criteria time-stepping method is proposed to improve the computational efficiency of the weakly-compressible SPH (WCSPH) method for modeling incompressible flows. The key idea is to introduce an advection time-step criterion, which is based on flow speed, for recreating the particle-interaction configuration. Within an advection time-step, several steps of pressure relaxation, i.e. the time integration of the particle density, position and velocity due to the action of pressure gradient, according to the acoustic time-step criterion based on the artificial speed of sound, can be carried out without updating the particle-interaction configuration and with much larger time steps compared with the conventional counterpart. The method has shown optimized computational performance through CPU cost analysis. Good accuracy is also obtained for the presented benchmarks implying promising potential of the proposed method for simulating incompressible flows and fluid-structure interactions. (C) 2019 Elsevier Inc. All rights reserved.
机译：实现粒子交互配置，其包括确定粒子邻列列表和计算相应的内核权重和梯度，并且时间整合是平滑粒子流体动力学（SPH）方法的性能强化要素。本文提出了一种双标准时间步进方法，提高了用于建模不可压缩流的弱可压平SPH（WCSPH）方法的计算效率。关键思想是引入一个基于流速的前进时间步骤标准，用于重新创建粒子交互配置。在一个平流时步骤中，根据基于人为速度的声音的声学时间步长标准与传统对应物相比，在不更新粒子相互作用配置并且具有更大的时间步长的情况下进行。该方法通过CPU成本分析显示了优​​化的计算性能。对于所提出的基准，还可以获得良好的精度，这暗示了提出的模拟不可压缩流动和流体结构相互作用方法的有希望的潜力。 （c）2019 Elsevier Inc.保留所有权利。

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