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Water 2019, 11(2), 280;

Numerical Research on the Resistance Reduction of Air Intake

College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China
Author to whom correspondence should be addressed.
Received: 13 December 2018 / Revised: 27 January 2019 / Accepted: 1 February 2019 / Published: 6 February 2019
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In order to investigate the drag-reducing effect of air intake, forward motion of planing trimaran models in calm water were simulated for Froude numbers ranging from 3.14–5.87. The hull body motion is implemented by coupling the fluid solver with motion solver. Numerical results were compared with the experimental data and showed good agreement. Contrastive calculations of models with and without air intake show that the air intake presents evident drag-reducing effect when Froude number is above 4.49, the cambered configuration of air intake could amplify air cavity and thus decrease fractional resistance. CFD incremental studies were subsequently carried out for the camber of air intake, it is found that the model with chamber-shortened air intake shows the worst resistance performance, while enlarging air intake chamber could reduce resistance at Froude numbers between 4.06 and 4.97. View Full-Text
Keywords: air intake; planing trimaran; numerical simulation; camber; air cavity air intake; planing trimaran; numerical simulation; camber; air cavity

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Du, L.; Sun, H.; Jiang, Y.; Li, P. Numerical Research on the Resistance Reduction of Air Intake. Water 2019, 11, 280.

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