DNS of turbulent boundary layers in the quasi-laminarization process

Guillermo Araya, Luciano Castillo, Fazle Hussain

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

In this investigation, Direct Numerical Simulations (DNS) of turbulent spatially developing boundary layers (SDBL) with prescribed Very Strong Favorable Pressure Gradients (VSFPG) are performed by means of the Dynamic Multi-scale Approach (DMA) developed by Araya et al. JFM, 670:518-605, 2011 [1]. Although the prescription of an external VSFPG significantly reduces turbulence production, the flow never becomes completely laminar due to the finite value of the streamwise Reynolds normal stress, and thus the flow is quasi-laminar. In this sense, the mean flow carries the footprint of turbulence, particularly in the streamwise direction of the Reynolds stresses. In addition, the vertical transports toward the wall of (Formula presented.) practically disappear in the inner region and significantly decrease in the outer region of the boundary layer during the quasi-laminarization stage. As a consequence, the “communication” between inner and outer regions is seriously restricted.

Original languageEnglish
Title of host publicationProgress in Wall Turbulence 2
Subtitle of host publicationUnderstanding and Modelling
EditorsJavier Jimenez, Ivan Marusic, Michel Stanislas
PublisherSpringer Netherland
Pages63-71
Number of pages9
ISBN (Print)9783319203874
DOIs
StatePublished - 2016
Event2nd WALLTURB Workshop on Understanding and modelling of wall turbulence, 2014 - Lille, France
Duration: Jun 18 2014Jun 20 2014

Publication series

NameERCOFTAC Series
Volume23
ISSN (Print)1382-4309
ISSN (Electronic)2215-1826

Conference

Conference2nd WALLTURB Workshop on Understanding and modelling of wall turbulence, 2014
CountryFrance
CityLille
Period06/18/1406/20/14

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  • Cite this

    Araya, G., Castillo, L., & Hussain, F. (2016). DNS of turbulent boundary layers in the quasi-laminarization process. In J. Jimenez, I. Marusic, & M. Stanislas (Eds.), Progress in Wall Turbulence 2: Understanding and Modelling (pp. 63-71). (ERCOFTAC Series; Vol. 23). Springer Netherland. https://doi.org/10.1007/978-3-319-20388-1_5