Spectral Analysis of a Vortex Wake Behind a Circular Cylinder in a Channel at Moderate Reynolds Numbers

被引：1

作者：

Kalinin, E. ^{[1
]}

Mazo, A. ^{[1
]}

Molochnikov, V. ^{[2
]}

Dushina, O. ^{[2
]}

机构：

[1] Kazan Volga Reg Fed Univ, NI Lobachevskii Inst Math & Mech, Kazan 420008, Russia

[2] Russian Acad Sci, Fed Res Ctr Kazan Sci Ctr, Inst Power Engn & Adv Technol, Kazan 420111, Russia

来源：

LOBACHEVSKII JOURNAL OF MATHEMATICS | 2021年 / 42卷 / 08期

基金：

俄罗斯科学基金会;

关键词：

circular cylinder; cross flow; channel; vortical patterns in wake; direct numerical simulation; Fourier transform; transition to turbulence; spectral analysis; FLOW; TRANSITION; SIMULATION; DYNAMICS;

D O I：

10.1134/S199508022108014X

中图分类号：

O1 [数学];

学科分类号：

0701 ; 070101 ;

摘要：

Direct numerical simulation is employed to study the complex vortical flow in the wake of a circular cylinder in a rectangular channel at Re approximate to 10(2). Formation and development of vortices behind bodies are governed by two phenomena: Karman street in the central part of the channel and a pair of spiral peripheral vortices near the channel sidewalls. Both of these phenomena introduce their own disturbances to the flow and can be essential depending on the Reynolds number and geometry of the cross section. Fourier transform yielded spectral density of kinetic energy of velocity fluctuations at fixed sample points in the flow and also revealed the patterns in formation of vortical properties of the wake, including the transition to turbulence and self- oscillations of aerodynamics coefficients of the streamlined body.

引用

页码：1989 / 1997

页数：9

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