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流动显示和图像处理期刊
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN 打印: 1065-3090
ISSN 在线: 1940-4336

流动显示和图像处理期刊

DOI: 10.1615/JFlowVisImageProc.v16.i1.30
pages 41-49

DETERMINATION OF THE THRESHOLD VALUE OF THE QUANTITY CHOSEN FOR VORTEX REPRESENTATION IN TURBULENT FLOW

Giancarlo Alfonsi
Fluid Dynamics Laboratory, Universita della Calabria, Via P. Bucci 42b, 87036 Rende (Cosenza), Italy
Leonardo Primavera
Fluid Dynamics Laboratory, Universita della Calabria, Via P. Bucci, Cubo 42b, 87036 Rende (Cosenza), Italy

ABSTRACT

In recent times much work has been devoted to the issue of vortex definition in turbulence. Several criteria for vortex identification have been devised and techniques for defining the correspondence between different criteria have been found, leading to the possibility of representing nearly-equally intense vortical structures using different identification methods. The issue remains open of calculating a threshold value of the quantity chosen for vortex eduction, being able to give a physically based representation of the vortical structure at hand. For this purpose we present a direct method based on some statistics of the velocity field, applied in particular to the issue of representing a hairpin vortex in the wall region of turbulent channel flow.


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