| Title: | Numerical modelling of air-induced drag reduction allowing the transition between bubbly, air layer and mixed regimes |
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| Authors: | ID Krull, Benjamin (Author)
ID Bilde, Kasper (Author)
ID Kringel, Christian (Author)
ID Meller, Richard (Author)
ID Tekavčič, Matej, Institut "Jožef Stefan" (Author)
ID Tziaros, Filotas (Author), et al. |
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| Files: |  URL - Source URL, visit https://www.sciencedirect.com/science/article/pii/S0141118725004778?via%3Dihub
 PDF - Presentation file, download (2,03 MB)
MD5: 43AF0DACB574DFEEF30A165BE46A659B
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IJS - Jožef Stefan Institute
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| Abstract: | Air lubrication can reduce the frictional resistance of ships, leading to significant fuel cost savings. However, the performance of air lubrication systems varies considerably, depending on the operating conditions. Complex gas morphologies play a crucial role here but are difficult to predict. Such a variety of morphologies (bubbly flow, air layers, or mixed regimes) requires morphology-adaptive methods, such as MultiMorph. This method allows for multiple morphologies of a given phase, including the transfer between them. The injection of gas can result in air bubbles, air layers, or a mixed regime, based on local transfer mechanisms. The ability to predict these morphologies is a distinctive feature of this method. Alternative methods prescribe a specific regime a priori, and do not allow a transition. To assess the suitability of MultiMorph for air lubrication problems, two geometries with different complexities are considered. The first test validates the method against flat plate experiments. Various water velocity and gas flow rate combinations were considered to investigate their influence on gas morphology and the associated drag reduction. The second case features a three-dimensional ship hull geometry with two bubble injectors to test the applicability of the method to a more complex scenario, including a curved geometry. The method performs well in both test cases and qualifies as a useful tool for numerical investigations of air lubrication phenomena. |
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| Keywords: | air lubrication, air layer, gas injection, bubbly flow, drag reduction, numerical modelling |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 28.10.2024 |
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| Article acceptance date: | 09.12.2025 |
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| Publication date: | 11.12.2025 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2026 |
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| Number of pages: | str. 1-13 |
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| Numbering: | Vol. 166, [article no.] 104892 |
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| Source: | Nizozemska |
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| PID: | 20.500.12556/DiRROS-24696  |
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| UDC: | 53 |
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| ISSN on article: | 1879-1549 |
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| DOI: | 10.1016/j.apor.2025.104892 |
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| COBISS.SI-ID: | 261194755 |
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| Copyright: | © 2025 Published by Elsevier Ltd. |
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| Note: | Nasl. z nasl. zaslona;
Soavtor iz Slovenije: Matej Tekavčič;
Opis vira z dne 12. 12. 2025;
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| Publication date in DiRROS: | 12.12.2025 |
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| Views: | 55 |
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| Downloads: | 18 |
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