A study of the stability properties of smooth particle hydrodynamics

被引:143
作者
Morris, JP
机构
[1] Mathematics Department, Monash University, Clayton
来源
PUBLICATIONS ASTRONOMICAL SOCIETY OF AUSTRALIA | 1996年 / 13卷 / 01期
关键词
methods; numerical hydrodynamics; magnetohydrodynamics; MHD instabilities;
D O I
10.1017/S1323358000020610
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
When using a formulation of smooth particle hydrodynamics (SPH) which conserves momentum exactly the motion of the particles is observed to be unstable to negative stress. It is also found that under normal circumstances a lattice of SPH particles is potentially unstable to transverse waves. This paper is a summary of a detailed report (Morris 1994) investigating the nature of these and other instabilities in depth. Approaches which may be used to eliminate these instabilities are suggested. It is found that the stability properties of SPH in general improve as higher-order spline interpolants, approximating a Gaussian, are used as kernels.
引用
收藏
页码:97 / 102
页数:6
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