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Mixing efficiency across Rayleigh-Taylor and Richtmeyer-Meshkov fronts

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10.4236/ojfd.2015.52017
 
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hdl:2117/28398

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Redondo Apraiz, José Manuel
Lopez Gonzalez-Nieto, Pilar
Cano Marchante, Jose Leandro
Andrés Garzón, Germán
Document typeArticle
Defense date2015-06-03
PublisherWorld Scientific Publishing
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
This work is protected by the corresponding intellectual and industrial property rights. Except where otherwise noted, its contents are licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
Mixing generated by gravitational acceleration and the role of local turbulence measured through multifractal methods is examined in numerical experiments of Rayleigh-Taylor and Richtmyer-Meshkov driven front occurring at density interfaces. The global advance of the fronts is compared with laboratory experiments and Nusselt and Sherwood numbers are calculated in both large eddy simulation (LES) and kinematic simulation KS models. In this experimental method, the mixing processes are generated by the evolution of a discrete set of forced turbulent plumes. We describe the corresponding qualitative results and the quantitative conclusions based on measures of the density field and of the height of the fluid layers. We present an experimental analysis to characterize the partial mixing process. The conclusions of this analysis are related to the mixing efficiency and the height of the final mixed layer as functions of the Atwood number, which ranges from 9.8×10-3 to 1.34×10-1
CitationRedondo, J. [et al.]. Mixing efficiency across Rayleigh-Taylor and Richtmeyer-Meshkov fronts. "Open Journal of Fluid Dynamics", 03 Juny 2015, vol. 5, p. 145-150. 
URIhttp://hdl.handle.net/2117/28398
DOI10.4236/ojfd.2015.52017
ISSN2165-3852
Publisher versionhttp://www.scirp.org/journal/ojfd/
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