基于SA模型的改进延迟分离涡模拟方法研究  

Research on Improved Delay Detached Eddy Simulation Method Based on SA Model

作　　者：肖峰 刘峰博 郝海兵[1] 李立[1] XIAO Feng;LIU Feng-bo;HAO Hai-bing;LI Li(Xi'an Aeronautics Computing Technique Research Institute,AVIC,Xi'an 710000,China)

机构地区：[1]航空工业西安航空计算技术研究所,陕西西安710000

出　　处：《航空计算技术》2024年第2期52-56,共5页Aeronautical Computing Technique

基　　金：陕西省2022年重点研发计划项目资助(2022ZDLGY02-07)。

摘　　要：流动分离问题的精细化模拟需求日益增加,传统的URANS方法已经无法满足精细化模拟要求,以基于SA的RANS/LES混合方法为基础,对DES方法中存在的网格诱导分离(Grid Induced Separation,GIS)问题及DDES方法存在的对数层不匹配(Log Level Mismatch,LLM)问题进行了改进,进一步发展了IDDES方法。通过对单圆柱绕流、亚音速三角翼及CRM-HL高升力标模算例的仿真验证该方法的有效性。数值结果分析表明:与URANS方法相比,DES类混合方法模拟精度更高,能更好地反映出流场丰富的涡系结构;与DES和DDES方法相比,发展的IDDES方法由于克服了DES和DDES方法的缺陷,数值模拟结果更接近实验值,可见IDDES方法具有很好的优越性和工程实用性。The demand for fine simulation of flow separation problem is increasing day by day,and traditional URANS method can't meet the requirements of refined simulation.Based on the RANS/LES hybrid method,this paper analyzes the Grid Induced Separation(GIS)problem existing in DES method and the Log Level Mismatch(LLM)problem existing in DDES method,the IDDES method is further developed.The typical model examples of flow around a single cylinder,subsonic deltawing and CRM-HL high lift are verified by simulation.The numerical results show that compared with the URANS method,the DES hybrid method has higher simulation accuracy and can better reflect the vortex system structure with abundant flow field.Compared with DES and DDES methods,the IDDES method overcomes the defects of DES and DDES methods,and the numerical simulation results are closer to the experiment values.It can be seen that IDDES method has good advantages and engineering practicability.

关 键 词：湍流流动 流动分离 数值模拟 混合方法 RANS/LES 

分 类 号：O35[理学—流体力学]