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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Печать: 2152-5102
ISSN Онлайн: 2152-5110

Выпуски:
Том 46, 2019 Том 45, 2018 Том 44, 2017 Том 43, 2016 Том 42, 2015 Том 41, 2014 Том 40, 2013 Том 39, 2012 Том 38, 2011 Том 37, 2010 Том 36, 2009 Том 35, 2008 Том 34, 2007 Том 33, 2006 Том 32, 2005 Том 31, 2004 Том 30, 2003 Том 29, 2002 Том 28, 2001 Том 27, 2000 Том 26, 1999 Том 25, 1998 Том 24, 1997 Том 23, 1996 Том 22, 1995

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v29.i6.40
18 pages

A Model of Dispersion in the Unsteady Separated Shear Flow past Complex Geometries

P. Franzese
Institute for Computational Sciences and Informatics George Mason University, Fairfax, Virginia 22030, USA
L. Zannetti
Dipartimento di Ingegneria Aeronautica, Politecnico di Torino 10129 Torino, Italy

Краткое описание

The chaotic dynamics of separated flows past complex geometries is studied by means of a low order model. The flows are assumed to be rotational and inviscid, and a technique is described to determine the stream functions for linear shear profiles. The geometry considered is a snow cornice, whose edge allows for the separation of the flow and reattachment downstream of the recirculation region. A free point vortex has been added to the flows in order to constrain the separation points to be located at the edge. Unsteadiness is imposed by displacing the vortex from equilibrium. The trajectories of passive scalars continuously released upwind of the separation point and trapped by the recirculating bubble are numerically integrated, and concentration time series are calculated at fixed locations downwind of the reattachment point. The heteroclinic tangle and lobe dynamics of the recirculation region appear to be among the causes of intermittent trapping and release of scalars, in agreement with the simulation performed by higher order models.


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