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2023 Journal Impact Factor - 0.7
2023 CiteScore - 1.4
ISSN 2083-6473
ISSN 2083-6481 (electronic version)
Editor-in-Chief
Associate Editor
Prof. Tomasz Neumann
Published by
TransNav, Faculty of Navigation
Gdynia Maritime University
3, John Paul II Avenue
81-345 Gdynia, POLAND
e-mail transnav@umg.edu.pl
Validation of a Flow Channel to Investigate Velocity Profiles of Friction-Reducing Ship Coatings
ABSTRACT: Reducing friction with specialised hull coatings or air lubrication technologies has a potential reducing energy consumption and emissions in shipping. The EU project AIRCOAT combines both by developing a passive air lubrication technology inspired by nature that is implemented on a self-adhesive foil system. Besides validating the friction reduction it is of high interest to understand the underlying mechanism that causes the reduction. Therefore, a flow channel was designed, that creates a stationary turbulent flow within a square duct allowing for non-invasive measurements by laser doppler velocimetry. The high spatial resolution of the laser device makes recording velocity profiles within the boundary layer down to the viscous sublayer possible. Determination of the wall shear stress τ enables direct comparison of different friction reduction experiments. In this paper we validate the methodology by determining the velocity profile of the flat channel wall (without coatings). We further use the results to validate a CFD model in created in OpenFOAM. We find that velocities along the longitudinal axis are generally in good agreement between numerical and experimental investigations.
KEYWORDS: Vessel Velocity, Computational Fluid Dynamics (CFD), Ship Coatings, Flow Channel, Laser Doppler Velocimeter (LDV), AIRCOAT Project, Reynolds Averaged Navier Stokes (RANS), Measurement Volume (MV)
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Citation note:
Weisheit J., Schneider V.E., Serr J.M., Hagemeister N., Oeffner J.: Validation of a Flow Channel to Investigate Velocity Profiles of Friction-Reducing Ship Coatings. TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation, Vol. 15, No. 1, doi:10.12716/1001.15.01.24, pp. 225-231, 2021
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