基于特征线理论的辨识法在激波装配中的应用

准确地给出激波位置信息对于激波装配极为重要.但是，在使用计算流体力学（computational fluid dyna-mics，CFD）方法模拟复杂流动时很难准确地给出激波的位置.根据激波捕捉得到的流场信息确定的激波位置往往带有极大误差，在定常问题的模拟中，这种误差可以随着迭代逐渐消除，然而在非定常问题的模拟中，这种误差往往会积累甚至导致计算崩溃.文章将基于特征线理论的激波辨识技术应用到激波装配中，根据已有流场信息准确判断激波的位置.对于定常问题，该方法的应用加速了收敛速度；对于非定常问题，该方法的应用可以极大地避免初始误差的产生. 

A Shock Detection Method Based on the Theory of Characteristics and its Application in Shock-Fitting Methods

It is very important to detect shock positions for a shock-fitting technique. However, it is difficult to get the exact position from the computational results. Numerical errors caused by captured methods usually lead to deflections of shock wave positions. In a steady flow, the deflected errors will be eliminated by iterations. In an unsteady flow, however, the deflected errors may be accumulated and led to wrong results. In the present work, a shock detection method based on the theory of characteristics was used to detect shock positions in shock-fitting techniques. This method is proved to be with good performance both in steady flows and unsteady flows.