A Study of Normalized Smoothed Particle Hydrodynamics

,; ,; ,; ,; ,

Journal of the Korea Institute of Military Science and Technology 2003;6(4):89-99.

, , , ,

정규 완화입자유동법의 고찰

박정수, 이진성, 박희덕, 김용석, 이재민

국방과학연구소

Abstract

Smoothed particle hydrodynamics, SPH, is a gridless Lagrangian technique which is a useful alternative numerical analysis method to simulate high velocity deformation problems as well as astrophysical and cosmological problems. The SPH method brings about some difficulties such as tensile Instability and stress oscillation. A new SPH method, so called normalized algorithm, was introduced to overcome these difficulties. In this paper we aimed to estimate this method and have developed an one-dimensional normalized SPH program. The high velocity impact model of an aluminum bar has been analysed by using the developed program and a commercial hydrocode, LS-DYNA. The obtained numerical results showed good agreement with the results of the same model in reference. The program also showed more stable results than those of LS-DYNA in stress oscillation. We hopefully expect that the developed one-dimensional normalized SPH program can be used to solve hydrodynamic problems especially for explosive detonation analysis.

Key Words: SPH, Normalized SPH, Kernel estimate, Impact analysis, Stress oscillation