Dynamic wake of a square cylinder controlled with steady jet positioned at the rear stagnation point

Haiyang Yu; Wen Li Chen; Yewei Huang; Hao Meng; Donglai Gao

doi:10.1016/j.oceaneng.2021.109157

Dynamic wake of a square cylinder controlled with steady jet positioned at the rear stagnation point

Haiyang Yu
, Wen Li Chen
, Yewei Huang
, Hao Meng
, Donglai Gao^*

^*Corresponding author for this work

School of Civil Engineering

Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

We experimentally investigated the dynamic wake evolution of flow around a square cylinder controlled with steady jet ejecting from the rear stagnation point in a wind tunnel at Reynolds number of 1.33 × 10⁴. For diversified jet momentum coefficients C_m, modal analyses, dynamic vortex shedding process, time-averaged turbulence kinetic energy (TKE) and Reynolds shear stress (RSS) were obtained from high-speed Particle Image Velocimetry (PIV) measurements, proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) analyses. As C_m grew, it was found that TKE distribution was restrained and RSS was shifted towards the outlet of the steady jet. Variations of dominant frequencies in POD and DMD modes were observed. The pattern of vortex shedding from the shear layer were transferred from antisymmetric to a symmetric one. The vortex sheets were also observed to be elongated downstream in the wake. Experimental results indicated that the dynamic wake of the square cylinder could be controlled significantly by the steady jet from the rear stagnation point.

Original language	English
Article number	109157
Journal	Ocean Engineering
Volume	233
DOIs	https://doi.org/10.1016/j.oceaneng.2021.109157
State	Published - 1 Aug 2021

Keywords

Active flow control
POD
Square cylinder
Steady jet
Wake dynamics

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10.1016/j.oceaneng.2021.109157

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title = "Dynamic wake of a square cylinder controlled with steady jet positioned at the rear stagnation point",

abstract = "We experimentally investigated the dynamic wake evolution of flow around a square cylinder controlled with steady jet ejecting from the rear stagnation point in a wind tunnel at Reynolds number of 1.33 × 104. For diversified jet momentum coefficients Cm, modal analyses, dynamic vortex shedding process, time-averaged turbulence kinetic energy (TKE) and Reynolds shear stress (RSS) were obtained from high-speed Particle Image Velocimetry (PIV) measurements, proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) analyses. As Cm grew, it was found that TKE distribution was restrained and RSS was shifted towards the outlet of the steady jet. Variations of dominant frequencies in POD and DMD modes were observed. The pattern of vortex shedding from the shear layer were transferred from antisymmetric to a symmetric one. The vortex sheets were also observed to be elongated downstream in the wake. Experimental results indicated that the dynamic wake of the square cylinder could be controlled significantly by the steady jet from the rear stagnation point.",

keywords = "Active flow control, POD, Square cylinder, Steady jet, Wake dynamics",

author = "Haiyang Yu and Chen, \{Wen Li\} and Yewei Huang and Hao Meng and Donglai Gao",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

year = "2021",

month = aug,

day = "1",

doi = "10.1016/j.oceaneng.2021.109157",

language = "英语",

volume = "233",

journal = "Ocean Engineering",

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}

TY - JOUR

T1 - Dynamic wake of a square cylinder controlled with steady jet positioned at the rear stagnation point

AU - Yu, Haiyang

AU - Chen, Wen Li

AU - Huang, Yewei

AU - Meng, Hao

AU - Gao, Donglai

PY - 2021/8/1

Y1 - 2021/8/1

N2 - We experimentally investigated the dynamic wake evolution of flow around a square cylinder controlled with steady jet ejecting from the rear stagnation point in a wind tunnel at Reynolds number of 1.33 × 104. For diversified jet momentum coefficients Cm, modal analyses, dynamic vortex shedding process, time-averaged turbulence kinetic energy (TKE) and Reynolds shear stress (RSS) were obtained from high-speed Particle Image Velocimetry (PIV) measurements, proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) analyses. As Cm grew, it was found that TKE distribution was restrained and RSS was shifted towards the outlet of the steady jet. Variations of dominant frequencies in POD and DMD modes were observed. The pattern of vortex shedding from the shear layer were transferred from antisymmetric to a symmetric one. The vortex sheets were also observed to be elongated downstream in the wake. Experimental results indicated that the dynamic wake of the square cylinder could be controlled significantly by the steady jet from the rear stagnation point.

AB - We experimentally investigated the dynamic wake evolution of flow around a square cylinder controlled with steady jet ejecting from the rear stagnation point in a wind tunnel at Reynolds number of 1.33 × 104. For diversified jet momentum coefficients Cm, modal analyses, dynamic vortex shedding process, time-averaged turbulence kinetic energy (TKE) and Reynolds shear stress (RSS) were obtained from high-speed Particle Image Velocimetry (PIV) measurements, proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) analyses. As Cm grew, it was found that TKE distribution was restrained and RSS was shifted towards the outlet of the steady jet. Variations of dominant frequencies in POD and DMD modes were observed. The pattern of vortex shedding from the shear layer were transferred from antisymmetric to a symmetric one. The vortex sheets were also observed to be elongated downstream in the wake. Experimental results indicated that the dynamic wake of the square cylinder could be controlled significantly by the steady jet from the rear stagnation point.

KW - Active flow control

KW - POD

KW - Square cylinder

KW - Steady jet

KW - Wake dynamics

UR - https://www.scopus.com/pages/publications/85106858772

U2 - 10.1016/j.oceaneng.2021.109157

DO - 10.1016/j.oceaneng.2021.109157

M3 - 文章

AN - SCOPUS:85106858772

SN - 0029-8018

VL - 233

JO - Ocean Engineering

JF - Ocean Engineering

M1 - 109157

ER -

Dynamic wake of a square cylinder controlled with steady jet positioned at the rear stagnation point

Abstract

Keywords

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