Universal Features of Turbulent/Non-turbulent and Turbulent/Turbulent Interfaces

被引：0

作者：

Alves, Pedro D. ^{[1
]}

Zecchetto, Marco ^{[1
]}

Xavier, Ricardo P. ^{[1
]}

Buxton, Oliver ^{[2
]}

da Silva, Carlos B. ^{[1
]}

机构：

[1] Univ Lisbon, Inst Super Tec, Lisbon, Portugal

[2] Imperial Coll London, Dept Aeronaut, London SW7 2AZ, England

来源：

PROCEEDINGS OF THE IUTAM SYMPOSIUM ON TURBULENT/NON-TURBULENT INTERFACE IN TURBULENT SHEAR FLOWS | 2025年 / 45卷

关键词：

Turbulent/non-turbulent interface (TNTI); Turbulent/turbulent interface (TTI); Free shear flows; Turbulent entrainment; ENTRAINMENT;

D O I：

10.1007/978-3-031-78151-3_7

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The characteristics of turbulent/non-turbulent interfaces and turbulent/turbulent interfaces (TNTI and TTI) are analysed by new carefully designed direct numerical simulations (DNS). Whereas TNTIs separate the turbulent from the non-turbulent region in free shear flows and turbulent boundary layers, TTIs appear whenever two regions of distinct turbulent characteristics interact such as in turbulent jets and wakes surrounded by external turbulent flow, or strongly perturbed turbulent boundary layers, i.e., when the external flow is in turbulent condition. Direct numerical simulations (DNS) of temporally evolving and spatially evolving TTIs are carried out to analyse the conditional mean profiles of enstrophy. Preliminary results suggest that, if properly normalised using the mean local Kolmogorov velocity and length scale, these conditional mean profiles are universal.

引用

页码：94 / 109

页数：16

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