Radiation Hydrodynamics of Floating Vertical Cylinder in Viscous Fluid

Ananthakrishnan, P.

doi:10.1061/(asce)0733-9399(1999)125:7(836)

Cited by 7 publications

(13 citation statements)

References 22 publications

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“…For quantification of the effects by comparison, we consider here the linear inviscid results obtained for the same problem in Yeung and Seah [26]. For analysis, a finite-difference method based on curvilinear coordinates, developed in [1,2,28], has been used. The solution method has been used to solve a range of free-surface flow problems involving wave-body and wave-vortex interactions as in [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…For analysis, a finite-difference method based on curvilinear coordinates, developed in [1,2,28], has been used. The solution method has been used to solve a range of free-surface flow problems involving wave-body and wave-vortex interactions as in [1][2][3]. The method and algorithms have thus been thoroughly vetted and validated.…”

Section: Introductionmentioning

confidence: 99%

“…Two-dimensional nonlinear time-domain solutions to both inviscid and viscous problems are obtained and the results are compared with linear, inviscid frequency-domain results obtained in [26] to quantify nonlinear and viscous effects. Finite-difference methods based on boundary-fitted coordinates are used for solving the governing equations in the time domain [2]. A primitive-variables based projection method [6] is used for the viscous analysis and a mixed Eulerian-Lagrangian formulation [11] for inviscid analysis.…”

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confidence: 99%

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Viscosity and nonlinearity effects on the forces and waves generated by a floating twin hull under heave oscillation

Ananthakrishnan

2015

Applied Ocean Research

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Viscosity and nonlinearity effects on the forces and waves generated by a floating twin hull under heave oscillation

Ananthakrishnan

2015

Applied Ocean Research

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“…The viscous wave-AUV hydrodynamics problem, ie., Navier-Stokes equations together with viscous free-surface conditions, is solved in primitive variables [4] using boundary-fitted coordinates based finite-difference method [2][3] [5] to determine drag, radiation and diffraction forces. Turbulence models, such as Baldwin-Lomax, are implemented for the solution of Reynolds-Averaged Navier-Stokes equations.…”

Section: Report Documentation Pagementioning

confidence: 99%

Application of Hydrodynamics and Dynamics Models for Efficient Operation of Modular Mini-AUVs in Shallow and Very-Shallow Waters

Ananthakrishnan¹

2002

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LONG-TERM GOALSThe long-term goal of this research is to contribute to improvements in design and motion-control of small autonomous underwater vehicles, including multiple-vehicle operations and particularly for missions in wave-energetic shallow and very-shallow waters, based on rigorous dynamic and hydrodynamic analyses and modeling. OBJECTIVESThe objective of the research is to carry out nonlinear dynamics and hydrodynamics analyses of small and modular mini-AUVs and determine their vehicle-stability, -maneuverability and motion-response characteristics for a range of missions, vehicle-configurations and sea states, and thereby contribute to improving the efficacy and reliability of modular AUVs. APPROACHThe research investigates two main aspects of dynamics and hydrodynamics of underwater vehicles; namely, [i] determination of hydrodynamic forces on an underwater vehicle including effects of viscosity, large-amplitude body motion and surface waves, and [ii] analysis of motion response, stability and maneuverability of underwater vehicles subjected to the hydrodynamic forces. The hydrodynamic and dynamic simulations are carried out for a range of ambient and vehicle parameters, in order to identify key factors affecting the performance of underwater vehicles.Computationally efficient and robust algorithms have been specially developed for the present analyses. The hydrodynamic forces are computed by solving the governing nonlinear equations using finite-difference and boundary-integral methods. The inviscid nonlinear wave-AUV interaction problem is solved and wave-radiation and -diffraction forces determined using a boundary-integral method based on the mixed Eulerian-Lagrangian formulation [6][8] [10] . As, in the regimes of validity, linear and inviscid calculations are straightforward and economical, boundary integral methods based on simple source distribution and linearized boundary conditions have also been developed [8] . Approximate linear and inviscid methods, as that based on the Froude-Krylov method [7][9] formulated 1

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“…The application of this basic technique is widespread, and its use for the simulation of unsteady free-surface flows goes back at least to [1]. Related applications were later done by [2][3][4][5][6][7] among others. For comprehensive reviews of the nonlinear water wave problem see e.g.…”

Section: Introductionmentioning

confidence: 99%

Efficient Solution of the 3D Laplace Problem for Nonlinear Wave-Structure Interaction

Bingham

Engsig-Karup

2008

Volume 6: Nick Newman Symposium on Marine Hydrodynamics; Yoshida and Maeda Special Symposium on Ocean Space Utilization; Specia

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This contribution presents our recent progress on developing an efficient solution for fully nonlinear wave-structure inter INTRODUCTIONThis paper describes a flexible-order, finite-difference based solution of the exact potential flow problem for nonlinear waves on a fluid of variable depth. The time-varying physical domain is mapped to a time-invariant boundary-fitted computational domain to obtain time-constant discrete differential operators. The application of this basic technique is widespread, and its use for the simulation of unsteady free-surface flows goes back at least to [1]. Related applications were later done by [2-7] among

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Radiation Hydrodynamics of Floating Vertical Cylinder in Viscous Fluid

Cited by 7 publications

References 22 publications

Viscosity and nonlinearity effects on the forces and waves generated by a floating twin hull under heave oscillation

Viscosity and nonlinearity effects on the forces and waves generated by a floating twin hull under heave oscillation

Application of Hydrodynamics and Dynamics Models for Efficient Operation of Modular Mini-AUVs in Shallow and Very-Shallow Waters

Efficient Solution of the 3D Laplace Problem for Nonlinear Wave-Structure Interaction

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