Modeling Breaking Ship Waves for Design and Analysis of Naval Vessels

Weymouth, Gabriel; Hendrickson, Kelli; Yue, Dick K. P.; Dommermuth, Douglas G.; Adams, Paul; Hand, Randall

doi:10.1109/hpcmp-ugc.2006.46

Cited by 4 publications

(9 citation statements)

References 3 publications

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“…Further applications of BDIM for solid/fluid systems (including flows around oscillating bodies, non-trivial and deformable solid geometries, as well as DNS/LES turbulent flow simulations) are given in [18,19,31]. Application of the boundary data immersion method in higher order solvers is under active research.…”

Section: Resultsmentioning

confidence: 99%

“…For example, there is a length scale disparity of up to seven orders of magnitude between a near-wall viscous flow and the gravity waves generated by a (full-scale) ship [18]. In many such applications, modeling the body with a slip-condition of some kind is physically realistic and much more computationally practical.…”

Section: Extension To the Immersion Of A Free-slip Bodymentioning

confidence: 99%

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Boundary data immersion method for Cartesian-grid simulations of fluid-body interaction problems

Weymouth

Yue

2011

Journal of Computational Physics

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116

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a b s t r a c tA new robust and accurate Cartesian-grid treatment for the immersion of solid bodies within a fluid with general boundary conditions is described. The new approach, the Boundary Data Immersion Method (BDIM), is derived based on a general integration kernel formulation which allows the field equations of each domain and the interfacial conditions to be combined analytically. The resulting governing equation for the complete domain preserves the behavior of the original system in an efficient Cartesian-grid method, including stable and accurate pressure values on the solid boundary. The kernel formulation allows a detailed analysis of the method, and it is demonstrated that BDIM is consistent, obtains second-order convergence relative to the kernel width, and is robust with respect to the grid and boundary alignment. Formulation for no-slip and free slip boundary conditions are derived and numerical results are obtained for the flow past a cylinder and the impact of blunt bodies through a free surface. The BDIM predictions are compared to analytic, experimental and previous numerical results confirming the properties, efficiency and efficacy of this new boundary treatment for Cartesian grid methods.

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Section: Resultsmentioning

confidence: 99%

Section: Extension To the Immersion Of A Free-slip Bodymentioning

confidence: 99%

Boundary data immersion method for Cartesian-grid simulations of fluid-body interaction problems

Weymouth

Yue

2011

Journal of Computational Physics

Self Cite

116

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“…We next consider the prediction of the heave and pitch response amplitude operators (RAO) for the Wigley hull in head seas. As in the previous example, this problem has been used for the validation of many numerical prediction methods including the unsteady-RANS CFD predictions of Weymouth et al (2007). The RANS predictions were found to be quite accurate with RMSE levels of around 2.5%, but each (F r, λ/L) evaluation took O(10 4 ) CPU hours.…”

Section: Pitch and Heave Motions Predictionsmentioning

confidence: 92%

“…Advanced numerical methods and high performance computing capabilities have produced high fidelity simulations of ship hydrodynamics such as time domain predictions of the motions and flow around a fully appended ship, resolving details of the breaking bow and stern waves and the underlying turbulent flow (e.g. Weymouth et al, 2007;Carrica et al, 2007). Such first-principle physics-based tools achieve accuracy through minimization of numerical and user errors.…”

Section: Introductionmentioning

confidence: 99%

Physics‐Based Learning Models for Ship Hydrodynamics

Weymouth

Yue

2012

jsr

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We present the concepts of physics-based learning models (PBLM) and their relevance and application to the field of ship hydrodynamics. The utility of physics-based learning is motivated by contrasting generic learning models (GLM) for regression predictions which do not presume any knowledge of the system other than the training data provided, with methods such as semi-empirical models which incorporate physical-insights along with data-fitting. PBLM provides a framework wherein intermediate models (IM), which capture (some) physical aspects of the problem, are incorporated into modern GLM tools to substantially improve the predictions of the latter, minimizing the reliance on costly experimental measurements or high-resolution high-fidelity numerical solutions. To illustrate the versatility and efficacy of PBLM, we present three wave-ship interaction problems: (i) at speed waterline profiles, (ii) ship motions in head seas, and (iii) threedimensional breaking bow waves. PBLM is shown to be robust and produce error rates at or below the uncertainty in the generated data, at a small fraction of the expense of high-resolution numerical predictions.

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“…At present, many studies have focused on wakes produced by towed bodies and self-propelled bodies in a steady state. However, a ship usually breaks the steady state by frequently accelerating and decelerating, transmitting the additional momentum to the background flow field, which leads to complex physical processes on the ocean surface, such as the formation of a jet, free-surface turbulence, and a large-scale vortex street structure [5]. The strong turbulence and nonlinear structure generated by the extra momentum will affect the electromagnetic scattering of the sea surface.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Scattering of Near-Field Turbulent Wake Generated by Accelerated Propeller

et al. 2021

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The electromagnetic scattering study of the turbulent wake of a moving ship has important application value in target recognition and tracking. However, to date, there has been insufficient research into the electromagnetic characteristics of near-field propeller turbulence. This study presents a new procedure for evaluating the electromagnetic scattering coefficient and imaging characteristics of turbulent wakes in the near field. By controlling the different values of the net momenta, a turbulent wake was generated using the large-eddy simulation method. The results show that the net momentum transferred to the background flow field determines the development of the turbulent wake, which explains the formation mechanism of the turbulence. Combined with the turbulent energy attenuation spectrum, the electromagnetic scattering characteristics of the turbulent wake were calculated using the two-scale facet mode. Using this method, the impact of different parameters on the scattering coefficient and the electromagnetic image of the turbulence wake were investigated, to explain the modulation mechanism and electromagnetic imaging characteristics of the near-field turbulent wake. Moreover, an application for estimating a ship’s heading is proposed based on the electromagnetic imaging characteristics of the turbulent wake.

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Modeling Breaking Ship Waves for Design and Analysis of Naval Vessels

Abstract: Abstract

Cited by 4 publications

References 3 publications

Boundary data immersion method for Cartesian-grid simulations of fluid-body interaction problems

Boundary data immersion method for Cartesian-grid simulations of fluid-body interaction problems

Physics‐Based Learning Models for Ship Hydrodynamics

Electromagnetic Scattering of Near-Field Turbulent Wake Generated by Accelerated Propeller

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