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Publisher DOI: 10.3390/fluids7050148
Title: Coexistence of inverse and direct energy cascades in faraday waves
Language: English
Authors: Colombi, Raffaele 
Rohde, Niclas 
Schlüter, Michael 
Kameke, Alexandra von 
Editors: De Stefano, Giuliano 
Keywords: turbulent flows; particle image velocimetry; Faraday waves; wave–fluid interaction; 47.27.-i; 47.80.Cb; 47.80.Jk
Issue Date: 24-Apr-2022
Publisher: MDPI
Source: Fluids 7 (5): 148 (2022-04-24)
Abstract (english): 
In nature, turbulent flows exist that are neither simply 2D nor 3D but are forced towards one state or the other by boundary conditions such as varying stratification. Here, we report the first evidence of the co-existence of an inverse and a direct energy cascade in an experimental flow driven by Faraday waves in water. We find that an inverse energy cascade at the fluid surface and a direct energy cascade in the 3D bulk flow underneath co-exist. We base our analysis on temporally and spatially well-resolved velocity fields obtained by particle image velocimetry measurements at planes parallel and perpendicular to the water surface. The findings also provide strong evidence that the intense turbulent 2D surface flow drives the 3D bulk flow through sporadic vertical jets as a source of momentum to the bulk liquid.
DOI: 10.15480/882.4325
ISSN: 2311-5521
Journal: Fluids 
Institute: Mehrphasenströmungen V-5 
Document Type: Article
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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