A modified-Liutex-based vortex-core-line extractor and its application  

作　　者：Jin-yan Cai Dong Li Zi-ming Xu Ze-yu Zhang Jiao-lin Cui 

机构地区：[1]School of Aeronautics,Northwestern Polytechnical University,Xi’an,710072,China [2]High Speed Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang,621000,China

出　　处：《Journal of Hydrodynamics》2023年第4期811-824,共14页水动力学研究与进展B辑（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.U173320010,11802328).

摘　　要：Vortices,which appear as swirling behaviour of a flow field,are an important phenomenon in fluid dynamics,and the extraction of vortex cores is necessary for the research of vortex evolution in many areas of fluid mechanics.The Liutex method is a milestone in vortex identification and provides a reasonable mathematical definition for a vortex core.Based on this definition,a novel integration-based method is presented,which can reduce the numerical error in the integration process through location optimization.Two typical test cases,the wake vortices of an A320 in the near-ground stage and a helicopter rotor,are examined to show that the proposed method can extract continuous vortex core lines with accuracy and efficiency for vortex parameter study.

关 键 词：Vortex definition flow visualization Liutex vortex core lines optimization 

分 类 号：O35[理学—流体力学]