Rortex based velocity gradient tensor decomposition

被引:51
作者
Gao, Yisheng [1 ]
Liu, Chaoqun [1 ]
机构
[1] Univ Texas Arlington, Dept Math, Arlington, TX 76019 USA
关键词
IDENTIFICATION; VORTEX; VORTICES;
D O I
10.1063/1.5084739
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Recently, a vector named Rortex was proposed to represent the local fluid rotation [C. Liu et al., "Rortex-A new vortex vector definition and vorticity tensor and vector decompositions," Phys. Fluids 30, 035103 (2018)]. In this paper, a universal Rortex based velocity gradient tensor decomposition is proposed and the relevant local velocity increment decomposition is provided. Vortex structures in boundary layer transition on a flat plate are analyzed to quantify the local rotational, compression-stretching, and shearing effects. The results demonstrate that vorticity is shearing-dominant, while the rotational part or Rortex in general occupies a small part of vorticity in most areas of this case. In other words, vorticity is a quality representing shearing rather than rotation or vortex in most regions of this case.
引用
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页数:8
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