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Immersed body motion: near-bottom added mass effects

Published online by Cambridge University Press:  30 March 2022

Shayan Maleki Open the ORCID record for Shayan Maleki [Opens in a new window]  and
Virgilio Fiorotto Open the ORCID record for Virgilio Fiorotto [Opens in a new window]
Shayan Maleki*
Affiliation:
Dams and Hydropower, Stantec, Brisbane, Australia
Virgilio Fiorotto
Affiliation:
Formerly Department of Engineering and Architecture, University of Trieste, Piazzale Europa, 1, 34100Trieste, Italy
*
† Email address for correspondence: [email protected]
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Abstract

The presence of a solid boundary can cause a substantial increase in added mass due to a solid body movement in the fluid. If the body is very close to the boundary, the added mass increases at an even greater rate. The added mass can be of considerable importance in many dams and hydropower, water/ocean, civil and mechanical engineering problems; furthermore, it has an important effect on the dynamics of the vibrating body in the fluid. The principal aim of this paper is to define a novel model to properly evaluate the near-bottom effects of the added mass and to investigate the instantaneous pressure field due to a body movement that changes the thickness of a compressible thin fluid film close to a solid boundary. The body movement can be due to the application of an external force according to Newton's law. This phenomenon is studied theoretically in this paper, and a hydrodynamic model able to compute the instantaneous pressure field in the thin fluid film is drawn out. The fluid film thickness variation, producing compression and decompression waves, tends to reduce the mean body displacement due to external forces, but it generates both high-frequency fluctuations in body force and in body displacements. For the first time, this novel study provides the near-bottom added mass and justifies the strong body accelerations measured in the laboratory experiments that have not been evidenced in the theoretical studies in the known literature.

JFM classification

Turbulent Flows: Turbulent boundary layers Mathematical Foundations: Computational methods
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 939 , 25 May 2022 , A18
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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