改进的HLLC方法及其在Baer-Nunziato模型中的应用  

A modified HLLC method and its application in Baer-Nunziato model

作　　者：李征[1] 王双虎[1] 

机构地区：[1]北京应用物理与计算数学研究所,北京100094

出　　处：《计算力学学报》2016年第5期738-746,752,共10页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(91130021;11372052;11371069)资助项目

摘　　要：波速估计对HLLC方法的计算影响较大,如果取值过小,则不能抓住波系特征;如果取值过大,则会引入较大的粘性。如何确定波速已有大量的研究,但是每种方法都有一定的适用范围。本文提出一种可避免估计波速的HLLC方法,并应用于两相流Baer-Nunziato模型模拟。本文方法与三种经典的波速估计方法进行比较,针对几类典型的B-N模型初值问题,不同的波速估计方法模拟能力差异较大,而本文方法可以自动确定适当的波速,因此得到较好的模拟结果。Wave-speed is very important for HLLC method.If the wave-speed is too small,the wave characters can not be catched;if it is too large,there would be more viscosity in the calculation.There are a lot of methods be caught to determine the wave-speed,but every method has its applicability.This paper presents a modified HLLC method without estimating wave-speed,and it is applied to simulate the Baer-Nunziato model.It is compared with three classic wave-speed estimating methods.Numerical results show that the new method is better than others.

关 键 词：可压缩 多相流 Baer-Nunziato模型 HLLC方法 波速 

分 类 号：O354[理学—流体力学]