Characteristics of the turbulent/nonturbulent interface in boundary layers, jets and shear-free turbulence

Da Silva, Carlos and Taveira, Rodrigo and Borrel Nogueras, Guillem (2014). Characteristics of the turbulent/nonturbulent interface in boundary layers, jets and shear-free turbulence. "Journal of Physics: Conference Series", v. 506 (n. 1); pp.. ISSN 1742-6596. https://doi.org/10.1088/1742-6596/506/1/012015.

Description

Title: Characteristics of the turbulent/nonturbulent interface in boundary layers, jets and shear-free turbulence
Author/s:
  • Da Silva, Carlos
  • Taveira, Rodrigo
  • Borrel Nogueras, Guillem
Item Type: Article
Título de Revista/Publicación: Journal of Physics: Conference Series
Date: 2014
ISSN: 1742-6596
Volume: 506
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Mecánica de Fluidos y Propulsión Aeroespacial
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The characteristics of turbulent/nonturbulent interfaces (TNTI) from boundary layers, jets and shear-free turbulence are compared using direct numerical simulations. The TNTI location is detected by assessing the volume of turbulent flow as function of the vorticity magnitude and is shown to be equivalent to other procedures using a scalar field. Vorticity maps show that the boundary layer contains a larger range of scales at the interface than in jets and shear-free turbulence where the change in vorticity characteristics across the TNTI is much more dramatic. The intermittency parameter shows that the extent of the intermittency region for jets and boundary layers is similar and is much bigger than in shear-free turbulence, and can be used to compute the vorticity threshold defining the TNTI location. The statistics of the vorticity jump across the TNTI exhibit the imprint of a large range of scales, from the Kolmogorov micro-scale to scales much bigger than the Taylor scale. Finally, it is shown that contrary to the classical view, the low-vorticity spots inside the jet are statistically similar to isotropic turbulence, suggesting that engulfing pockets simply do not exist in jets

Funding Projects

TypeCodeAcronymLeaderTitle
FP7ERC-2010.AdG-20100224UnspecifiedUnspecifiedUnspecified

More information

Item ID: 37464
DC Identifier: http://oa.upm.es/37464/
OAI Identifier: oai:oa.upm.es:37464
DOI: 10.1088/1742-6596/506/1/012015
Official URL: http://iopscience.iop.org/article/10.1088/1742-6596/506/1/012015/pdf
Deposited by: Memoria Investigacion
Deposited on: 14 Oct 2015 10:28
Last Modified: 14 Oct 2015 14:12
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