20.500.12556/DiRROS-24696 Numerical modelling of air-induced drag reduction allowing the transition between bubbly, air layer and mixed regimes 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. air lubrication air layer gas injection bubbly flow drag reduction numerical modelling plast zraka zmanjšanje upora numerično modeliranje true false true Elsevier Nizozemska Angleški jezik Slovenski jezik © 2025 Published by Elsevier Ltd. Neznano 2025-12-12 14:06:35 2025-12-12 14:06:35 2025-12-13 03:51:09 0000-00-00 00:00:00 2026 0 0 Nasl. z nasl. zaslona; Soavtor iz Slovenije: Matej Tekavčič; Opis vira z dne 12. 12. 2025; str. 1-13 Vol. 166, [article no.] 104892 Jan. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2024-10-28 2025-12-09 2025-12-11 53 1879-1549 10.1016/j.apor.2025.104892 261194755 https://www.sciencedirect.com/science/article/pii/S0141118725004778?via%3Dihub 1 650410c6-d75b-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=36876 RAZ_Krull_Benjamin_2026.pdf RAZ_Krull_Benjamin_2026.pdf 1 43AF0DACB574DFEEF30A165BE46A659B cac88cdb8ca5cb6394438610ded0061a74265af73d26c581ec3aff9429574022 a7c417f2-d75b-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=36879 Institut Jožef Stefan 0 0 0