一维理想弹塑性流体的数值模拟及壁热现象的抑制  

Numerical Simulation of One-dimensional Elastic-Perfectly Plastic Flow and Suppression of Wall Heating Phenomenon

作　　者：李肖 孙晨 沈智军[1] LI Xiao;SUN Chen;SHEN Zhijun(Institute of Applied Physics and Computational Mathematics,Beijing 100088,China;Graduate School of China Academy of Engineering Physics,Beijing 100088,China)

机构地区：[1]北京应用物理与计算数学研究所,北京100088 [2]中国工程物理研究院研究生院,北京100088

出　　处：《计算物理》2020年第5期539-550,共12页Chinese Journal of Computational Physics

基　　金：科学挑战专题(JCKY2016212A502);国家自然科学基金(U1630249,11971071);计算物理实验室基金资助项目

摘　　要：针对一维理想弹塑性流体的Wilkins模型,提出HLLC型的近似黎曼解法器.该解法器引入塑性波并保证波的个数和真实的物理情况一致,其中波速选取由波系的特征分析来确定.整个算法实施简单,无需迭代,为减少强冲击(稀疏)模拟时的壁热误差,设计相应的壁热粘性,有效地抑制了非物理的壁热现象.An HLLC-type approximate Riemann solver is proposed to simulate one-dimensional elastic-perfectly plastic flow with Wilkins model.This Riemann solver introduces plastic wave and has the same wave number with actual physics.The wave speed is determined by characteristic analysis of wave system.The algorithm is simple to implement and does not need iteration.In order to reduce wall heating error in the simulation for strong shock(or rarefaction),wall heating viscosity is designed to effectively suppress the non-physical wall heating phenomenon.

关 键 词：弹塑性流体 塑性波 黎曼解法器 HLLC 壁热现象 

分 类 号：O35[理学—流体力学]