DES of Delft Catamaran at Static Drift Condition
Understanding of three-dimensional separation around ships is important for developing next-generation ships with improved performance in extreme maneuvers. The objective of this study is to identify and analyze the vortical structures, instabilities, and wave breaking for the high-speed Delft-372 catamaran at static drift conditions. Computational fluid dynamics (CFD) simulations at static drift angles (β) of 9° and 24° were conducted using detached eddy simulation (DES) for turbulence modeling. The CFD predictions were validated against experimental fluid dynamics (EFD) data provided by two different research facilities, the Italian Ship Model Basin (INSEAN) and the Bulgarian Ship Hydrodynamics Centre (BSHC). Validation studies for local velocity components were performed for β=9° and a validation study for forces, moment, and motions was performed for β=24°. Overall EFD and CFD showed good agreement for local velocity components, forces, and sink. Larger errors were observed for moments and trim angle. Large forebody vortex and wave-induced vortices followed by two smaller counter-rotating vortices at the stern and keel were identified on each hull. Large forebody vorticies at the forebody were validated with particle image velocimetry (PIV) data. However, PIV measurement locations were not appropriate to validate other vortices observed in CFD. Open-closed type instability was identified for the forebody vortices.
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Document Type: Research Article
Publication date: December 1, 2014
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- The Naval Engineers Journal is the peer-reviewed journal of the American Society of Naval Engineers (ASNE). ASNE is the leading professional engineering society for engineers, scientists and allied professionals who conceive, design, develop, test, construct, outfit, operate and maintain complex naval and maritime ships, submarines and aircraft and their associated systems and subsystems.