Interfacial hydroelastic hydraulic falls and trapped waves over bottom obstacles

Chai, Jin, Wang, Zhan and Parau, Emilian ORCID: (2023) Interfacial hydroelastic hydraulic falls and trapped waves over bottom obstacles. Journal of Fluids and Structures, 116. ISSN 0889-9746

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Steady nonlinear flexural-gravity hydraulic falls on the interface of a two-layer density stratified flow past a submerged obstruction on the bottom of a channel are considered. The fluid is assumed to be ideal, and the flow is irrotational. We extend the previous works (Dias and Vanden-Broeck, 2002; Wang et al., 2022) by including the effect of hydroelasticity. The interface is modeled as a thin elastic shell with the Cosserat theory. The boundary integral equation techniques are employed to find steady solutions by numerically solving the full Euler equations. New solutions characterized by subcritical flow upstream with different depth ratios (thick upper layer, thick bottom layer, or critical depth) are found, and the effects of the aspect ratio of obstruction are investigated. By introducing a second obstruction downstream, solutions characterized by a train of trapped waves are sought with wavelength coherent with the prediction of the linear dispersion relation. In addition, solutions with a soliton-like form and oscillatory decaying tails are found when the sheet rigidity is small and the second obstruction is placed upstream.

Item Type: Article
Additional Information: Funding Information: This work was supported by the National Natural Science Foundation of China (Nos. 11911530171), the Key Program of the National Natural Science Foundation of China (No. 12132018 ), and the Royal Society International Exchanges Travel, China , Grant (No. IEC\NSFC\181279).
Uncontrolled Keywords: boundary integral method,hydraulic fall,interfacial wave,stratified flow,mechanical engineering ,/dk/atira/pure/subjectarea/asjc/2200/2210
Faculty \ School: Faculty of Science > School of Mathematics
UEA Research Groups: Faculty of Science > Research Groups > Fluid and Solid Mechanics
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Depositing User: LivePure Connector
Date Deposited: 15 Dec 2022 04:06
Last Modified: 14 Feb 2023 14:30
DOI: 10.1016/j.jfluidstructs.2022.103813

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