NDLI: Vortex Identification in Turbulent Flows: Isotropic, Sphere Wake

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Chakraborty, P. Balachandar, S. Adrian, R. J.
Copyright Year	2003
Abstract	Vortices, the regions of swirling coherent motion of fluid, are of fundamental importance in understanding the dynamics of turbulent flows. Recent advances in computational and experimental resources have resulted in massive volumes of highly resolved flow field data. Identification of coherent vortex structures from these space-time discretized flow dataset is the key issue of vortex identification. We consider identification schemes based on pointwise analysis of the velocity gradient tensor. A new measure of the local spatial coherence in a vortex is introduced. Different criteria are compared for two classes of turbulent flows: isotropic and sphere wake. Remarkably similar vortex structures are observed using the Q, λ2 and swirling strength criterion. An explanation based on swirling strength and the proposed local coherence measure is offered for this observation.
Sponsorship	Fluids Engineering Division
Starting Page	819
Ending Page	824
Page Count	6
File Format	PDF
ISBN	0791836975
DOI	10.1115/FEDSM2003-45082
e-ISBN	0791836738
Volume Number	Volume 2: Symposia, Parts A, B, and C
Conference Proceedings	ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
Language	English
Publisher Date	2003-07-06
Publisher Place	Honolulu, Hawaii, USA
Access Restriction	Subscribed
Subject Keyword	Turbulence Fluids Tensors Swirling flow Dynamics (mechanics) Vortices Spacetime Wakes Flow (dynamics)
Content Type	Text
Resource Type	Article

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