arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1908.06225physics.comp-ph
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光滑粒子流体动力学中的边界条件及其不稳定性

On the boundary condition and related instability in the Smoothed Particle Hydrodynamics

Chong Ye, Philipe Mota, Jin Li, Kai Lin, Wei-Liang Qian

摘要:

在这项工作中,我们将探讨光滑粒子流体动力学关于伯格方程的各个相关方面。算法的稳定性,精度和效率进行了研究,在不同的实现。特别是,我们认为,边界条件起着至关重要的作用,数值实现的稳定性。此外,该问题被证明是密切相关的初始粒子分布和插值方案。其中,我们介绍了一个插值方案称为对称化有限粒子方法。该方案的主要优点是其实现不涉及核函数的任何导数。关于运动运动方程,使用两种不同的情况进行计算,其中粒子被选择为静止的或动态演化的。所得到的结果进行了比较,通过使用空间导数的标准有限差分法。我们的数值结果表明,在边界条件的选择不同的计划之间的细微差别。特别是,观察到一种新类型的不稳定性,其中当颗粒开始相互穿越时,规则分布受到损害。本研究的影响和进一步的讨论也得到了解决。

英文摘要:

In this work, we explore various relevant aspects of the Smoothed Particle Hydrodynamics regarding Burger's equation. The stability, precision, and efficiency of the algorithm are investigated in terms of different implementations. In particular, we argue that the boundary condition plays an essential role in the stability of numerical implementation. Besides, the issue is shown to be closely associated with the initial particle distribution and the interpolation scheme. Among others, we introduce an interpolation scheme termed symmetrized finite particle method. The main advantage of the scheme is that its implementation does not involve any derivative of the kernel function. Concerning the equation of motion, the calculations are carried out using two distinct scenarios where the particles are chosen to be either stationary or dynamically evolved. The obtained results are compared with those obtained by using the standard finite difference method for spatial derivatives. Our numerical results indicate subtle differences between different schemes regarding the choice of boundary condition. In particular, a novel type of instability is observed where the regular distribution is compromised as the particles start to traverse each other. Implications and further discussions of the present study are also addressed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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