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What makes the free surface waves over topographies convex or concave? : A study with Fourier analysis and particle tracking

Title data

Dauth, Markus ; Schörner, Mario ; Aksel, Nuri:
What makes the free surface waves over topographies convex or concave? : A study with Fourier analysis and particle tracking.
In: Physics of Fluids. Vol. 29 (1 September 2017) Issue 9 . - 092108. - 15 S..
ISSN 1527-2435
DOI: https://doi.org/10.1063/1.5003574

Official URL: Volltext

Project information

Project financing: Andere

Abstract in another language

This article contributes to a better understanding of traveling waves over periodically undulated inclines. Therefore we used various measurement techniques to combine multiple information: (a) linear stability measurements, (b) measurement of the evolution of traveling free surface waves, and (c) single particle tracking. Thereby, we revealed two distinct wave shapes for different substrates, namely, convex and concave. Furthermore, we investigated the influence of the excitation amplitude and frequency on the flow’s linear stability and the evolution of nonlinear traveling waves. By varying the substrate shape and the wavelength to amplitude ratio, the dependence on the underlying flow field and the geometric constraints is examined. We report (a) an energy transfer from the excitation frequency to its higher harmonics, (b) a strongly varying strength of beat frequencies of the traveling wave and the substrate wave for different substrates, (c) similarities of the traveling wave for different substrate shapes but the same wavelength to amplitude ratio, and (d) a strong interaction between the traveling waves and the steady-state flow with even an eddy breakup for some substrates

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Applied Mechanis and Fluid Dynamics
Faculties > Faculty of Engineering Science > Chair Applied Mechanis and Fluid Dynamics > Chair Applied Mechanis and Fluid Dynamics - Univ.-Prof. Dr. Nuri Aksel
Faculties
Faculties > Faculty of Engineering Science
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 24 Jan 2018 10:03
Last Modified: 08 Feb 2018 09:46
URI: https://eref.uni-bayreuth.de/id/eprint/42005