Wake Transitions Behind a Cube

Qingrui Meng

doi:10.26182/vhpr-a562

Wake Transitions Behind a Cube

Qingrui Meng

School of Engineering

Research output: Thesis › Doctoral Thesis

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Abstract

The wake transition route for flows behind a cube is studied through direct numerical simulations and linear stability analysis. The physical mechanism for regular hairpin-vortex shedding is explained, and the process of the regular bifurcation in the three-dimensional space is characterised by a coupled pitchfork bifurcation model and the unstable eigenspace obtained in the linear stability analysis. The effect of the aspect ratio on the spatio-temporal symmetry of the wakes is discovered after extending the research to general square cross-section bluff bodies. Higher Reynolds number experiments are carried out to measure the drag coefficients of a cuboid-like ROV model.

Original language	English
Qualification	Doctor of Philosophy
Awarding Institution	The University of Western Australia
Supervisors/Advisors	An, Hongwei, Supervisor Cheng, Liang, Supervisor Kimiaei, Mehrdad, Supervisor
Award date	20 Oct 2022
DOIs	https://doi.org/10.26182/vhpr-a562
Publication status	Unpublished - 2022

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10.26182/vhpr-a562

THESIS - DOCTOR OF PHILOSOPHY - MENG Qingrui - 2022
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Cite this

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title = "Wake Transitions Behind a Cube",

abstract = "The wake transition route for flows behind a cube is studied through direct numerical simulations and linear stability analysis. The physical mechanism for regular hairpin-vortex shedding is explained, and the process of the regular bifurcation in the three-dimensional space is characterised by a coupled pitchfork bifurcation model and the unstable eigenspace obtained in the linear stability analysis. The effect of the aspect ratio on the spatio-temporal symmetry of the wakes is discovered after extending the research to general square cross-section bluff bodies. Higher Reynolds number experiments are carried out to measure the drag coefficients of a cuboid-like ROV model.",

keywords = "bluff body, wake transition, flow instability, bifurcation, vortex shedding",

author = "Qingrui Meng",

year = "2022",

doi = "10.26182/vhpr-a562",

language = "English",

school = "The University of Western Australia",

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TY - BOOK

T1 - Wake Transitions Behind a Cube

AU - Meng, Qingrui

PY - 2022

Y1 - 2022

N2 - The wake transition route for flows behind a cube is studied through direct numerical simulations and linear stability analysis. The physical mechanism for regular hairpin-vortex shedding is explained, and the process of the regular bifurcation in the three-dimensional space is characterised by a coupled pitchfork bifurcation model and the unstable eigenspace obtained in the linear stability analysis. The effect of the aspect ratio on the spatio-temporal symmetry of the wakes is discovered after extending the research to general square cross-section bluff bodies. Higher Reynolds number experiments are carried out to measure the drag coefficients of a cuboid-like ROV model.

AB - The wake transition route for flows behind a cube is studied through direct numerical simulations and linear stability analysis. The physical mechanism for regular hairpin-vortex shedding is explained, and the process of the regular bifurcation in the three-dimensional space is characterised by a coupled pitchfork bifurcation model and the unstable eigenspace obtained in the linear stability analysis. The effect of the aspect ratio on the spatio-temporal symmetry of the wakes is discovered after extending the research to general square cross-section bluff bodies. Higher Reynolds number experiments are carried out to measure the drag coefficients of a cuboid-like ROV model.

KW - bluff body

KW - wake transition

KW - flow instability

KW - bifurcation

KW - vortex shedding

U2 - 10.26182/vhpr-a562

DO - 10.26182/vhpr-a562

M3 - Doctoral Thesis

ER -

Wake Transitions Behind a Cube

Abstract

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