{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/163438"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/163438","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Wedged Vortex Generator Applications for Marine Vessels","abstract":"This thesis investigates the effectiveness of vortex generators (VGs) in reducing viscous drag in hydrodynamic applications. Initial experimental and computational fluid dynamics analyses identified wedge-shaped VGs as the optimal design for flow manipulation. Comparative testing of three wedge shaped VG sizes at 1.3 m/s revealed the most effective configuration, which was subsequently evaluated across speeds ranging from 1.0 m/s to 1.6 m/s. The results showed a viscous drag reduction of 7.9% at 1.4 m/s. These findings were extrapolated to a full-scale bulk carrier using appropriate geometric and dynamic scaling factors. Total resistance was partitioned using Holtrop-Mennen approximations, allowing the drag reduction to be realistically applied to operational conditions on a trans-Pacific route. Material and installation cost estimates were also developed. Finally, implications for propulsion efficiency, flow-induced vibrations, and cavitation are discussed, with recommendations for future self-propelled model testing to further explore these effects.","abstract_html":"This thesis investigates the effectiveness of vortex generators (VGs) in reducing viscous drag in hydrodynamic applications. Initial experimental and computational fluid dynamics analyses identified wedge-shaped VGs as the optimal design for flow manipulation. Comparative testing of three wedge shaped VG sizes at 1.3 m/s revealed the most effective configuration, which was subsequently evaluated across speeds ranging from 1.0 m/s to 1.6 m/s. The results showed a viscous drag reduction of 7.9% at 1.4 m/s. These findings were extrapolated to a full-scale bulk carrier using appropriate geometric and dynamic scaling factors. Total resistance was partitioned using Holtrop-Mennen approximations, allowing the drag reduction to be realistically applied to operational conditions on a trans-Pacific route. Material and installation cost estimates were also developed. Finally, implications for propulsion efficiency, flow-induced vibrations, and cavitation are discussed, with recommendations for future self-propelled model testing to further explore these effects.","abstract_has_math":false,"creators":["Kimmeth, Jack"],"institution":"Massachusetts Institute of Technology","degree_name":"Master","degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. 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Initial experimental and computational fluid dynamics analyses identified wedge-shaped VGs as the optimal design for flow manipulation. Comparative testing of three wedge shaped VG sizes at 1.3 m/s revealed the most effective configuration, which was subsequently evaluated across speeds ranging from 1.0 m/s to 1.6 m/s. The results showed a viscous drag reduction of 7.9% at 1.4 m/s. These findings were extrapolated to a full-scale bulk carrier using appropriate geometric and dynamic scaling factors. Total resistance was partitioned using Holtrop-Mennen approximations, allowing the drag reduction to be realistically applied to operational conditions on a trans-Pacific route. Material and installation cost estimates were also developed. 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