TY - GEN
T1 - DNS of turbulent boundary layers in the quasi-laminarization process
AU - Araya, Guillermo
AU - Castillo, Luciano
AU - Hussain, Fazle
N1 - Funding Information:
GA acknowledges XSEDE (Project Number: TG-CTS120046) and SCOREC (Scientific Computation Research Center, Rensselaer Polytechnic Institute) for supplying computational resources.
Publisher Copyright:
© Springer International Publishing Switzerland 2016.
Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
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U2 - 10.1007/978-3-319-20388-1_5
DO - 10.1007/978-3-319-20388-1_5
M3 - Conference contribution
AN - SCOPUS:84964801643
SN - 9783319203874
T3 - ERCOFTAC Series
SP - 63
EP - 71
BT - Progress in Wall Turbulence 2
A2 - Jimenez, Javier
A2 - Marusic, Ivan
A2 - Stanislas, Michel
PB - Springer Netherland
T2 - 2nd WALLTURB Workshop on Understanding and modelling of wall turbulence, 2014
Y2 - 18 June 2014 through 20 June 2014
ER -