Experimental and Theoretical Investigation of Hydrodynamic Drag Loads on Flexible Side-by-Side Blades

Zhilong Wei*, Trygve Kristiansen, David Kristiansen, Yanlin Shao

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

Our recent experimental investigations of flexible side-by-side blades under both steady and unsteady flows have observed flutter in both scenarios. Flutter significantly impacts blade kinematics and the hydrodynamic drag experienced by the blades. Our numerical approach [1], utilizing the reactive force model, successfully reproduces flutter phenomena. In contrast, the traditional Morison’s equation fails to trigger flutter. In the static regime where flutter does not occur, the bulk drag coefficients calibrated from experiments in steady and unsteady flows can be unified through an effective Cauchy number, allowing for the use of analytical models developed for steady flows in unsteady flows. In the flutter regime, using the bulk drag coefficient from steady flows underestimates the drag load in oscillatory flow.
Original languageEnglish
Title of host publicationProceedings of 40th International Workshop on Water Waves and Floating Bodies
Number of pages4
PublisherIWWWFB
Publication date2025
Publication statusPublished - 2025
Event40th International Workshop on Water Waves and Floating Bodies - Shanghai, China
Duration: 11 May 202514 May 2025

Conference

Conference40th International Workshop on Water Waves and Floating Bodies
Country/TerritoryChina
CityShanghai
Period11/05/202514/05/2025

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