ISSN 2083-6473
ISSN 2083-6481 (electronic version)




Associate Editor
Prof. Tomasz Neumann

Published by
TransNav, Faculty of Navigation
Gdynia Maritime University
3, John Paul II Avenue
81-345 Gdynia, POLAND
www http://www.transnav.eu
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.
Barthlott, W., Schimmel, T., Wiersch, S., Koch, K., Brede, M., Barczewski, M., Walheim, S., Weis, A., Kaltenmaier, A., Leder, A., others: The Salvinia paradox: superhydrophobic surfaces with hydrophilic pins for air retention under water. Advanced Materials. 22, 21, 2325–2328 (2010).
Boutier, A. ed: Laser velocimetry in fluid mechanics. ISTE and Wiley, London and Hoboken, NJ (2012).
Czarske, J.: Laser Doppler velocity profile - doi:10.1088/0957-0233/12/1/306
Czarske, J., Büttner, L., Razik, T., Mülle - doi:10.1088/0957-0233/13/12/324
Dues, M., Burgmann, S., Kriegseis, J., Büttner, L., Czarske, J., Janoske, U.: Profilsensormessungen in einem Kanal mit poroeser Wand: Flow-Measurements within a channel with porous wall using laser Doppler profile-sensor. In: Fachtagung \textquotedblExperiementelle Stroemungsmechanik\textquotedbl. (2019).
Gandyra, D., Walheim, S., Gorb, S., Ditsche, P., Barthlott, W., Schimmel, T.: Air Retention under Water by the Floating Fern Salvinia: The Crucial Role of a Trapped Air Layer as a Pneumatic Spring. Small. 16, 42, 2003425 (2020).
ILA GmbH: Handbook LDV: LDV system fp50 shift/unshift and software LDA control QT. (2008).
ILA GmbH: LDV Profile Sensor: ILA Products. (2021).
Menter, F., Kuntz, M., Langtry, R.B.: Ten years of industrial experience with the SST turbulence model. Heat and Mass Transfer. 4, (2003).
Oeffner, J., Hagemeister, N., Bretschneider, H., Schimmel, T., Jahn, C.: Reducing Friction with Passive Air Lubrication: Initial Experimental Results and the Numerical Validation Concept of AIRCOAT. Proceedings of HIPER’20: 12th Symposium on High-Performance Marine Vehicles:, High-Performance Marine Vehicles, Cortona, Italy, 12-14 October. 405–417 (2020).
Oeffner, J., Jalkanen, J.-P., Walheim, S., Schimmel, T.: From nature to green shipping: Assessing the economic and environmental potential of AIRCOAT on low-draught ships. Proceedings of 8th Transport Research, Arena TRA 2020, April 27-30, 2020, Helsinki, Finland. (2020).
Oeffner, J., Weisheit, J., Oikonomou, F., Schimmel, T., Jahn, C.: Biomimetic Self-adhesives Foils instead of Paints: a Business Case for a Sustainable Ship Hull Coating. Proceedings of 2021 World of Shipping Portugal. An International Research Conference on Maritime Affairs 28-29 January 2021, Online Conference, from Portugal to the World. (2021).
OpenCFD Ltd.: OpenFOAM User Guide. (2021).
OpenCFD Ltd.: OpenFOAM User Guide: A.1 Standard Solvers. (2021).
Park, H., Sun, G., Kim, C.-J. “CJ - doi:10.1017/jfm.2014.151
Pope, S.B.: Turbulent flows. Cambridge Univ. Press, Cambridge (2000).
Schlichting, H., Gersten, K., Krause, E.: Grenzschicht-Theorie. Springer, Berlin (1997).
Zanoun, E.-S.: Flow characteristics in low - doi:10.1016/j.aej.2017.08.024
Zhang, H., Trias, F.X., Gorobets, A., Tan, Y., Oliva, - doi:10.1016/j.ijheatfluidflow.2015.06.003
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

Other publications of authors:

File downloaded 55 times

Important: TransNav.eu cookie usage
The TransNav.eu website uses certain cookies. A cookie is a text-only string of information that the TransNav.EU website transfers to the cookie file of the browser on your computer. Cookies allow the TransNav.eu website to perform properly and remember your browsing history. Cookies also help a website to arrange content to match your preferred interests more quickly. Cookies alone cannot be used to identify you.
Akceptuję pliki cookies z tej strony