The influence of stratification and slope in mixing layers

被引：1
作者：
Taira, D. E. [1 ]
Schettini, E. B. C. [2 ]
Silvestrini, J. H. [3 ]
机构：
[1] Inst Fed Sul Rio Grandense IFSul, Praca Vinte Setembro 455, BR-96015360 Pelotas, RS, Brazil
[2] Univ Fed Rio Grande do Sul, Inst Pesquisas Hidraul, BR-91501970 Porto Alegre, RS, Brazil
[3] Pontificia Univ Catolica Rio Grande do Sul PUCRS, Fac Engn, BR-90619900 Porto Alegre, RS, Brazil
来源：
IUTAM-ABCM SYMPOSIUM ON LAMINAR TURBULENT TRANSITION | 2015年 / 14卷
关键词：
inclined mixing layer; stable stratification; Direct Numerical Simulation; linear stability analysis; TURBULENT; INSTABILITIES;
D O I：
10.1016/j.piutam.2015.03.084
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The purpose of this numerical work is focused on the dynamics of a stably stratified inclined mixing layer. Both effects, stratification and slope, are considered through relevant flow parameters. Chebyshev's approximations and Direct Numerical Simulation (DNS) are used in the context of linear stability analysis for different Richardson numbers and slopes. Two-dimensional temporal and spatial simulations are employed to examine baroclinic layer and the evolution of primary and secondary Kelvin-Helmholtz instabilities. In three-dimensional configuration, only stratification effects are considered. The numerical results show persistence of the translative instability with formation of intense longitudinal vortices highly influenced by the Richardson number. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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页码：536 / 542
页数：7
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