Prediction of Hydrodynamic Forces and Moments for Underwater Vehicles Using Overset Grids

Boger, David A.; Dreyer, James J.

doi:10.2514/6.2006-1148

Cited by 54 publications

(26 citation statements)

References 9 publications

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“…In comparison to the two-dimensional (2D) NACA 0012 hydrofoil experiments, the predicted wave elevations near the foil are slightly lower and no breaking wave is apparent (Duncan, 1983).…”

Section: A Noncavitating Wing Interacting With a Freesurfacementioning

confidence: 97%

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Free-Surface Proximity Effects in Developed and Super-Cavitation

Kinzel

Lindau

Kunz

2008

2008 DoD HPCMP Users Group Conference

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This paper summarizes a number of large-scale multiphase computation fluid dynamics (CFD) analyses of relevance to the Defense Advanced Research Projects Agency (DARPA) Underwater Express Program. The specific focus of this paper is on developed and supercavitating configurations related to submerged vehicles and control surfaces where proximity to the free-surface is relevant. The results and interpretation of several large scale simulations, enabled by adaptive and overset meshing technology, Large Eddy Simulation technology, a hybrid volume-fraction based level-set approach and high performance computing (HPC) resources, are reported.

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“…In comparison to the two-dimensional (2D) NACA 0012 hydrofoil experiments, the predicted wave elevations near the foil are slightly lower and no breaking wave is apparent (Duncan, 1983).…”

Section: A Noncavitating Wing Interacting With a Freesurfacementioning

confidence: 97%

“…2. The term / p Q τ Γ ∂ ∂ is a result of the Choi-Merkle, dual-time preconditioned approach(Choi and Merkle, 1993).…”

mentioning

confidence: 99%

Free-Surface Proximity Effects in Developed and Super-Cavitation

Kinzel

Lindau

Kunz

2008

2008 DoD HPCMP Users Group Conference

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“…Secondly an appropriate turbulence closure model (TCM) is required, which can model the influence of turbulence on the flow. It is believed that the discrepancies between numerical and experimentally calculated hydrodynamic derivatives, up to 20%, for a manoeuvring underwater vehicle, observed in previous studies, [3], [4], [5] and [6] are largely due to these issues.…”

mentioning

confidence: 96%

Influence of turbulence closure models on the vortical flow field around a submarine body undergoing steady drift

2010

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Manoeuvring underwater vehicles experience complex three dimensional flow. Features include stagnation and boundary layer separation along a convex surface. The resulting free vortex sheet rolls up to form a pair of streamwise body vortices. The track and strength of the body vortex pair results in a nonlinear increase in lift with as body incidence increases. Consequently, accurate capture of the body vortex pair is essential if the flow field around a manoeuvring submarine and the resulting hydrodynamic loading is to be correctly found. This work highlights the importance of both grid convergence and turbulence closure models on the strength and path of the crossflow induced body vortices experienced by the DOR submarine model at an incidence angle of 15 • . Five turbulence closure models are considered; Spalart-Allmaras, k − ε, k − ω, Shear Stress Transport and the SSG Reynolds stress model. The SSG Reynolds stress model shows potential improvements in predicting both the path and strength of the body vortex over standard one and two equation turbulence closure models based on an eddy viscosity approach.

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“…As the design iterates towards its final form, more expensive analysis techniques become appropriate, and RANS simulations may be used to represent numerically the pure drift and rotating-arm tests traditionally used to derive the hydrodynamic derivatives of ships and submarines (see, for example, references [29] to [32]). The present authors [33] used the commercial RANS code ANSYS CFX to derive the hydrodynamic derivatives for the AUV Autosub3.…”

Section: Hull Fairingmentioning

confidence: 99%

The Use of Computational Fluid Dynamics to Aid Cost-Effective Hydrodynamic Design of Autonomous Underwater Vehicles

Phillips

Turnock

Furlong

2010

Proceedings of the Institution of Mechanical Engineers, Part M:

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Abstract:The missions being proposed for autonomous underwater vehicles (AUVs), by both marine scientists and industry, are becoming increasingly complex and challenging. In order to meet these demands the next generation of AUVs will need to be faster, to operate for longer durations, and to be more manoeuvrable than existing vehicles. It is therefore vital that the hydrodynamic forces and moments acting on a self-propelled manoeuvring AUV can be predicted accurately at the initial design stage. In order to achieve this, the use of a computational-fluiddynamics-based analysis is suggested. The approaches developed are predominantly steady state and suitable for running on a workstation personal computer using a commercial software licence. It is estimated that the proposed simulations would take a competent user less than 1 month for a new concept design. The total cost of these simulations is significantly lower than the cost of building a model and having it commercially tested to capture the same level of detail for the resistance, propulsion, and manoeuvring performance. Based on the validation studies presented, it is estimated that on a 2610 6 element structured mesh a competent user should be able to predict hydrodynamic forces to within at least 10 per cent and moments to within 20 per cent of in-service performance.

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Prediction of Hydrodynamic Forces and Moments for Underwater Vehicles Using Overset Grids

Cited by 54 publications

References 9 publications

Free-Surface Proximity Effects in Developed and Super-Cavitation

Free-Surface Proximity Effects in Developed and Super-Cavitation

Influence of turbulence closure models on the vortical flow field around a submarine body undergoing steady drift

The Use of Computational Fluid Dynamics to Aid Cost-Effective Hydrodynamic Design of Autonomous Underwater Vehicles

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