The optimum dimensions for a long-range, autonomous, deep-diving, underwater vehicle for oceanographic research

Huggins, A.; Packwood, A.

doi:10.1016/0029-8018(94)90028-0

Cited by 16 publications

(3 citation statements)

References 1 publication

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“…For an individual AUV this may be achieved by obtaining the optimum hydrodynamic design e.g. hull, propeller and surface control (Bellingham and Willcox, 1996;Bradley, 1992;Bradley et al, 2001;Dalton and Zedan, 1980;Huggins and Packwood, 1994;Murali, 2005, 2006;Jagadeesh et al, 2009;Kinsey, 1998;Parsons, 1972;Parsons et al, 1974;Phillips, 2009;Sarkar et al, 1997a;Stevenson et al, 2007). For a fleet of multiple AUVs, minimising the energy consumption may be targeted for both individuals and the entire fleet.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of a fleet of towed AUVs

2014

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This paper investigates the influence of the propeller on the drag of twin self-propelled AUVs, firstly, to examine the fleet performance for various propulsive conditions of leading and following AUV and, secondly, to study the parametric influence of transverse separations and longitudinal offsets on the fleet's drag. A series of CFD RANS-SST simulations have been performed at the Reynolds Number 3.2 × 10 6 with a commercial code ANSYS CFX 12.1. Mesh convergence is tested and validated with experimental and empirical results. The RANS-HO and RANS-UT propeller models are selected to estimate the time averaged thrust and torque of the propeller. The results show that the self-propelled vehicles experience an additional drag which is dominated by the thrust distribution of the propeller rather than torque. The drag of the following AUV is increased due to the upstream propeller, defined as a propeller race deduction. For the parametric studies, the results show that increasing the spacing results in a lower drag. The two sources of self-propelled drag increment are the viscous interaction and a direct result of proximity to the propeller race upstream. The result highlights the importance of considering both thrust deduction and any propeller race deductions when calculating the propulsive power consumption.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of a fleet of towed AUVs

2014

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“…Recently, Frayssinhes et al [19] also presented an interesting model based on potential flow theory, which is able to predict the local fibre orientation of veneers. Meanwhile, Sahin and Hyman [20] and Huggins and Packwood [21] manipulated the potential flow panel method to optimise the shape of an autonomous submersible. An analysis on the generation of wave drag due to a moving Rankine ovoid in stratified fluid was reported by Xu et al [22].…”

Section: Introductionmentioning

confidence: 99%

Semi-Analytical Method for Unsymmetrical Doublet Flow Using Sink- and Source-Dominant Formulation

et al. 2022

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Potential flow formed by doublet flow has been well applied in environmental applications and geothermal designs such as reservoir and fuel injectors. Most of the doublet flow is assumed based on the sink and source with equivalent strength and distance from the origin, forming the well-known Rankine oval structure when a far-field flow is superposed. A semi-analytical method is formulated to systematically investigate the unsymmetrical doublet flow with different strengths of sink and source. The general mathematical expression for unsymmetrical doublet flow is derived analytically before the streamline and the potential line can be visualised via a numerical approach. The results revealed that the doublet flows altered the Rankine oval structure to form aerofoil-like geometry. When the far-field flow interferes with the general Doublet configuration, unique flow structures such as convex, concave, and various wing shapes could be generated. The current study provides new insight on producing aerodynamic curves for the design of bio-inspired structures.

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“…Since the range and endurance are limited by the cruise speed (Bingham et al, 2002;Furlong et al, 2007;McPhail, 2009;Stevenson et al, 2007;Tripp, 2006), the options to extend an endurance are: minimising drag (Huggins and Packwood, 1994;Parsons, 1972;Parsons et al, 1974), enhancing propulsive efficiency (Ageev, 2000(Ageev, , 1995Stevenson et al, 2007), increasing specific energy of power sources (Ageev, 2000;Alers, 1981), and reducing hotel load Phillips et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of a pair of self-propelled AUVs operating in tandem

2015

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This paper investigates the influence of the propeller race on upstream and downstream self-propelled AUVs. Initially simulations of a self-propelled hull are performed at the Reynolds Number 3.2 × 10 6 with the commercial RANS code ANSYS CFX 12.1, utilising a body force model to replicate the impact of the propeller utilising momentum source terms. This is then extended to consider a fleet of two self-propelled vehicles operating at a range of longitudinal offset and transverse separations. The results highlight that operation in close proximity to another self-propelled vessel has a significant impact of both the flow around the hull and drag experienced by the vehicle. A propeller race deduction is proposed to account for the increase in vehicle drag due to the propulsors of other vehicles. The propeller race deduction is dependent upon both longitudinal and transverse separation. From a vehicle or mission design perspective, it is important to correctly understand the true propulsive energy budget of the vehicle and its impact on both range and endurance. This study highlights the importance of considering both thrust deduction and any propeller race deductions when calculating the propulsive power consumption of an individual or fleet of vehicles.

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The optimum dimensions for a long-range, autonomous, deep-diving, underwater vehicle for oceanographic research

Cited by 16 publications

References 1 publication

Numerical investigation of a fleet of towed AUVs

Numerical investigation of a fleet of towed AUVs

Semi-Analytical Method for Unsymmetrical Doublet Flow Using Sink- and Source-Dominant Formulation

Numerical investigation of a pair of self-propelled AUVs operating in tandem

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