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During the launching of the AUV especially in air-launching, the water entry problem is inevitable. The AUV will stir the flow field of surrounding fluid during the moving into water, while the fluid will act a strong force on the AUV in return, which may cause trajectory deflection problems or damage to their structure and inner components in severe cases. The water entry experiment of full-size...
Propulsive performance of harmonically heaving and pitching foil is degraded by a breakdown in the angle of attack profile. In this paper, we build up a two-degree freedom harmonic motion in both heave and pitch motion as the baseline, and compare directly the performance obtained with specific angle of attack profiles and three-degree freedom harmonic motion. We set these profiles are: a square,...
The purpose of this paper is to provide guidance for AUV manoeuvering of two vehicles missions. In this paper, the numerical simulation of interaction between two vehicles with different size is conducted using CFD code. Mesh independence is tested and then validated with experimental results in previous paper. In an aim to predict the factors that influence the hydrodynamic performance, the simulation...
With numerical studies of two tandem foils, the effect of size gaps and distance between two tandem foils on reducing drag is presented. A symmetric 4-digit NACA0012 foil has been used as the outline of leading foil, while the trailing foil has been redesigned as multiple of scale down of leading one, by which the size gaps between two tandem foil can be non-dimensionalized as a parameter Sg. Moreover,...
Flapping foil propulsion with high-efficiency, maneuvering capability becomes a hot topic recently. However, most research about flapping-foil motion patterns focused on pure sinusoidal pattern. Effect of flapping-foil motion pattern to the hydrodynamic performance was presented in this paper by numerical simulations of 2D flow around a NACA0012 foil with asymmetric and non-sinusoidal pitching motion...
The numerical study on the effect of flapping foils with a modified shape on efficiently bio-mimetic propulsion is presented. A symmetric 4-digit NACA0006 foil was used as a baseline in this work, the design of modified foils were derived by altering NACA0006 foil leading section as thicker NACA foil's counterparts and keeping its trailing section unchanged, and as a result, the modified foils were...
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