Please use this identifier to cite or link to this item: https://doi.org/10.1017/jfm.2020.351
Title: Stability of the solitary wave boundary layer subject to finite-amplitude disturbances
Authors: Onder, Asim 
Liu, Philip L-F 
Keywords: Science & Technology
Technology
Physical Sciences
Mechanics
Physics, Fluids & Plasmas
Physics
boundary-layer stability
transition to turbulence
solitary waves
HYDRODYNAMIC STABILITY
COHERENT STRUCTURES
BREAKING WAVES
TRANSITION
FLOW
TURBULENCE
GROWTH
STREAKS
BOTTOM
INSTABILITY
Issue Date: 2020
Publisher: CAMBRIDGE UNIV PRESS
Citation: Onder, Asim, Liu, Philip L-F (2020). Stability of the solitary wave boundary layer subject to finite-amplitude disturbances. JOURNAL OF FLUID MECHANICS 896. ScholarBank@NUS Repository. https://doi.org/10.1017/jfm.2020.351
Abstract: © The Author(s), 2020. Published by Cambridge University Press. The stability and transition in the bottom boundary layer under a solitary wave are analysed in the presence of finite-amplitude disturbances. First, the receptivity of the boundary layer is investigated using a linear input-output analysis, in which the environment noise is modelled as distributed body forces. The most 'dangerous' perturbations in a time frame until flow reversal are found to be arranged as counter-rotating streamwise-constant vortices. One of these vortex configurations is then selected and deployed to nonlinear equations, and streaks of various amplitudes are generated via the lift-up mechanism. By means of secondary stability analysis and direct numerical simulations, the dual role of streaks in the boundary-layer transition is shown. When the amplitude of streaks remains moderate, these elongated features remain stable until the adverse-pressure-gradient stage and have a dampening effect on the instabilities developing thereafter. In contrast, when the low-speed streaks reach high amplitudes exceeding 15A % of the free stream velocity at the respective phase, they become highly unstable to secondary sinuous modes in the outer shear layers. Consequently, a subcritical transition to turbulence, i.e.A bypass transition, can be initiated already in the favourable-pressure-gradient region ahead of the wave crest.
Source Title: JOURNAL OF FLUID MECHANICS
URI: https://scholarbank.nus.edu.sg/handle/10635/171091
ISSN: 00221120
14697645
DOI: 10.1017/jfm.2020.351
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