The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
Douglas G. Dommermuth - One of the best experts on this subject based on the ideXlab platform.
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An Experimental and Computational Study of Breaking Wave Impact Forces
arXiv: Fluid Dynamics, 2014Co-Authors: Anne M. Fullerton, Susan Brewton, Kyle A. Brucker, Douglas G. DommermuthAbstract:The impact forces generated by the impact of a Breaking Wave are poorly understood. These impulsive hydrodynamic loads to a ship's hull are of short duration relative to ship motions and buoyant Wave loads and often result in extremely high pressures. The physics of Breaking Waves is a poorly understood, complex, multiphase phenomenon involving violent jet sprays, strong free-surface turbulence, air entrainment and bubble generation, all of which interact with the flow field and the adjacent structure. This paper will describe a set of experiments that were performed, at the Naval Surface Warfare Center, Carderock Division (NSWCCD), in 2006, to measure the hydrodynamic loads of regular nonBreaking and focused Breaking Waves on a 0.305 m x 0.305 m (1.0 ft x 1.0 ft) square plate and discuss the results of this study. The paper will also discuss Computational Fluid Dynamics (CFD) code predictions of Breaking Waves and Wave impact loads. The CFD code utilized in this study is Numerical Flow Analysis (NFA).
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a numerical simulation of a plunging Breaking Wave
Physics of Fluids, 2010Co-Authors: Paul D. Adams, Kevin W. George, Mike Stephens, Kyle A. Brucker, Thomas T Oshea, Douglas G. DommermuthAbstract:ONR Program Manager: Dr. Patrick Purtell. ONR Contract Number: N00014-07-C-0184. Computer resources provided by the DoD High Performance Computing Modernization Program at the ERDC DoD Supercomputing Research Center, Vicksburg MS.
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A Numerical Simulation of a Plunging Breaking Wave
Physics of Fluids, 2010Co-Authors: Paul D. Adams, Kevin W. George, Mike Stephens, Kyle A. Brucker, Thomas T. O'shea, Douglas G. DommermuthAbstract:This article describes the fluid dynamics video, "A Numerical Simulation of a Plunging Breaking Wave", which was submitted to the gallery of fluid motion at the 2009 APS/DFD conference. The simulation was of a deep-water plunging Breaking Wave. It was a two-phase calculation which used a Volume of Fluid (VOF) method to simulate the interface between the two immiscible fluids. Surface tension and viscous effects were not considered. The initial Wave was generated by applying a spatio-temporal pressure forcing on the free surface. The video shows the 50% isocontour of the volume fraction from several different perspectives. Significant air entrainment is observed as well as the presence of stream-wise vortex structures.
Yoshimi Goda - One of the best experts on this subject based on the ideXlab platform.
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reanalysis of regular and random Breaking Wave statistics
Coastal Engineering Journal, 2010Co-Authors: Yoshimi GodaAbstract:Statistics of Breaking Waves across the surf zone are reanalyzed on the basis of various sets of field and laboratory data so as to provide coastal engineers with reliable information on Breaking w...
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Dynamic response of upright breakwaters to impulsive Breaking Wave forces
Coastal Engineering, 1994Co-Authors: Yoshimi GodaAbstract:Abstract A formulation is made for the motion of an upright section of a composite breakwater activated by an impulsive force due to Breaking Waves. The foundation, including a rubble mound, is represented by a system of mass and dual springs for rotational and horizontal motions. The validity of the model was confirmed by a small scale model test in which a concrete block rested upon a crushed stone mound was hit by a pendulum of known momentum. The model is then combined with the momentum theory of impulsive Breaking Wave force to yield an estimate of the sliding distance of an upright breakwater. The coefficients of elastic uniform shear and nonuniform compression of the foundation are estimated to be a few hundred tons per cubic meters on the basis of the vibration data of the Alger and Haboro breakwaters. The equivalent pressure of Breaking Waves effective for breakwater sliding is then estimated to be 3 times or less the hydrostatic head of the Wave height.
Jian-jun Shu - One of the best experts on this subject based on the ideXlab platform.
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Slamming of a Breaking Wave on a wall.
Physical Review E, 2004Co-Authors: Jian-jun ShuAbstract:This paper is intended to study impact forces of Breaking Waves on a rigid wall based on a nonlinear potential-flow theory. This is a model problem for some technologically important design issues such as the impact of Breaking Waves on ships, coastal and offshore structures. We are interested in the short-time successive triggering of nonlinear effects using a small-time expansion. The analytical solutions for the impact force on a rigid wall and the free-surface profile are derived.
Ankit Aggarwal - One of the best experts on this subject based on the ideXlab platform.
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estimation of Breaking Wave properties and their interaction with a jacket structure
Journal of Fluids and Structures, 2019Co-Authors: Ankit Aggarwal, Hans Bihs, Seimur Shirinov, Dag MyrhaugAbstract:Abstract The numerical investigation of Breaking Wave interaction with jacket type offshore wind turbine substructures is quite challenging due to multiple jacket members and the complicated hydrodynamics of Breaking Waves around and inside the jacket. The present study is focused on investigating Breaking Wave forces and hydrodynamics on a jacket using a computational fluid dynamics (CFD) based numerical model. The Breaking Wave forces on a jacket mounted on a slope are investigated in a numerical Wave tank. The experimental and numerical free surface elevations and Wave forces are compared to validate the numerical model. The breaker indices and geometric profile properties for different Wave steepness cases are correlated with force peaks. Further, the effect of changing the jacket location with respect to the Wave breaker is investigated for different jacket locations for different Wave steepness cases. In general, the force peaks are maximum when the fully grown breaker tongue impacts the jacket legs with large momentum. The influence of the jacket location on the Wave-induced impact force rise time for both force peaks is also investigated in detail. The statistical analysis shows that the lognormal distribution is suitable to predict the Breaking Wave force statistics. The complex free surface features including the Wave breaker tongue, secondary Wave jet, chute like phenomenon and rejoining of the secondary Wave jet with the free surface are observed during the interaction of Breaking Waves with the jacket. The role of horizontal velocity components in estimating the peak Wave loads is further explored both deterministically and probabilistically.
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numerical study of irregular Breaking Wave forces on a monopile for offshore wind turbines
Energy Procedia, 2016Co-Authors: Ankit Aggarwal, Hans Bihs, Mayilvahanan Alagan Chella, Oivind Asgeir ArntsenAbstract:Abstract Offshore wind turbine substructures consisting of cylindrical members are exposed to highly non-linear and Breaking Waves in shallow waters [1] . Those structures experience extreme impulsive loads of short duration from Breaking Waves that can cause permanent structural damage [2] . The main purpose of the present paper is to investigate the Wave impact forces on a slender cylinder from plunging Breaking Waves in shallow waters both experimentally and numerically. The present study consists of two major parts: laboratory measurements and numerical simulations. The laboratory experiments are performed with regular Waves. Plunging Breaking Waves are generated and free surface elevations are measured around the cylinder. Next, numerical simulations are carried out in the three-dimensional numerical Wave tank REEF3D. The model is based on the incompressible Reynolds-averaged Navier-Stokes equations together with the k − ω for turbulence and the level set method for free surface. The numerical results are compared with the laboratory measurements in order to validate the numerical model. A good agreement between the computed results and the experimental data is seen for the Breaking Wave properties. Further, the Breaking Wave forces and the free surface deformations during the interaction of plunging Breaking Waves with a vertical cylinder are investigated and they are reasonably well represented in the numerical simulations.
Oivind Asgeir Arntsen - One of the best experts on this subject based on the ideXlab platform.
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numerical study of irregular Breaking Wave forces on a monopile for offshore wind turbines
Energy Procedia, 2016Co-Authors: Ankit Aggarwal, Hans Bihs, Mayilvahanan Alagan Chella, Oivind Asgeir ArntsenAbstract:Abstract Offshore wind turbine substructures consisting of cylindrical members are exposed to highly non-linear and Breaking Waves in shallow waters [1] . Those structures experience extreme impulsive loads of short duration from Breaking Waves that can cause permanent structural damage [2] . The main purpose of the present paper is to investigate the Wave impact forces on a slender cylinder from plunging Breaking Waves in shallow waters both experimentally and numerically. The present study consists of two major parts: laboratory measurements and numerical simulations. The laboratory experiments are performed with regular Waves. Plunging Breaking Waves are generated and free surface elevations are measured around the cylinder. Next, numerical simulations are carried out in the three-dimensional numerical Wave tank REEF3D. The model is based on the incompressible Reynolds-averaged Navier-Stokes equations together with the k − ω for turbulence and the level set method for free surface. The numerical results are compared with the laboratory measurements in order to validate the numerical model. A good agreement between the computed results and the experimental data is seen for the Breaking Wave properties. Further, the Breaking Wave forces and the free surface deformations during the interaction of plunging Breaking Waves with a vertical cylinder are investigated and they are reasonably well represented in the numerical simulations.