Computational Modeling for Non-equilibrium Shock Tube Flows

Bensassi, Khalil ; Brandis, Aaron M ; Cruden, Brett A

关键词: EQUILIBRIUM FLOW;    SHOCK TUBES;    SIMULATION;    COMPUTATIONAL FLUID DYNAMICS;    TIME;    MODELS;    NUMERICAL ANALYSIS;    TEST FACILITIES;   

RP-ID  :  ARC-E-DAA-TN70486

学科分类：航空航天科学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Time accurate simulation of non-equilibrium flows inside shock tube facilities presents several challenges from both physical and mathematical aspects. Furthermore, the drastic computational cost makes it non-practical to support real-time experimental test campaign. In this work, we explore other methods for modeling the shock tube prob- lem with the main focus on the post-shock region and the absolute radiation emanating from it. The proposed alternative approach is several orders of magnitude less computa- tionally expansive while still accurate enough with regards to the quantities of interest. Excellent agreement is found with the well-established stagnation-line approach. Comparison with the time-accurate simulation shows good agreement close to the peak values and disagreement of the temperatures relaxation and radiance profiles toward equilibrium, due to shock speed unsteadiness.