摘要
基于ALE(Arbitrary Lagrangian-Eulerian Equation)方程的有限体积法,采用高精度Roe方法及结构化动网格,利用嵌入网格技术及动边界条件,对弹丸由膛内高压气体推动射出到完全飞离初始流场的整个过程进行了数值模拟。根据数值结果绘制了膛口流场密度和压力分布的时序图,形象地再现了膛口流场中初始激波、弓形激波及膛口冲击波,以及接触间断、漩涡和剪切层等的动力学发展过程。结果基本反映了膛口流场的典型变化特征,为进一步研究真实膛口流场(如带化学反应、湍流等)奠定了基础。
In this paper the finite volume method of Arbitrary Lagrangian-Eulerian high precise Roe scheme was adopted by using structured dynamic mesh, chimera boundary condition. The full process of the projectile driven by high pressure gas in equation（ALE） and method and moving side the gun to shoot out and penetrate through the flow field disturbed by precursor shock was simulated numerically. The density and pressure distributions of the muzzle flow were plotted sequently based on the predicted resuits, which demonstrated visually the production and development of the precursor shock wave, bow shock wave, muzzle blast wave, and the contact surfaces, vortex and shear layer near the muzzle. Results indicated that the typical characteristics of the muzzle flow were captured basically and the numerical method adopted here was feasible. This work lays on the foundation of our further investigation on the real muzzle flow, such as considering the chemical reaction, turbulence, etc.
出处
《计算力学学报》
EI
CAS
CSCD
北大核心
2008年第4期563-567,共5页
Chinese Journal of Computational Mechanics
基金
国防重点实验室基金资助
关键词
数值模拟
ALE方程
动网格
膛口流场
numerical simulation
ALE equation
dynamic mesh
muzzle flow
