The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Iftikhar B. Abbasov - One of the best experts on this subject based on the ideXlab platform.
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Three-dimensional simulation of the runup of nonlinear Surface Gravity waves
Computational Mathematics and Mathematical Physics, 2014Co-Authors: Iftikhar B. AbbasovAbstract:The runup of nonlinear Surface Gravity waves is numerically simulated in two and three dimensions on the basis of the Navier-Stokes equations. The three-dimensional problem is formulated, and the boundary and initial conditions are described. The splitting method over physical processes is used to construct a discrete model taking into account the cell occupation coefficient. The runup of nonlinear Surface Gravity waves is simulated in two dimensions for slopes of various geometries, and the numerical results are analyzed. The structural features of the simulated three-dimensional basin are described. Three-dimensional models for the staged runup of nonlinear Surface Gravity waves breaking on coastal slopes in shallow water areas are considered.
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THREE-DIMENSIONAL SIMULATION THE RUNUP OF NONLINEAR Surface Gravity WAVES ON SHALLOW COAST
International Journal of Pure and Apllied Mathematics, 2014Co-Authors: Iftikhar B. AbbasovAbstract:The paper is devoted to three-dimensional numerical modeling of a runup of nonlinear Surface Gravity waves based on Navier-Stokes equations. The three-dimensional problem is stated, boundary and initial conditions are described. Using split method for physical processes, there has been constructed the discrete model with consideration of cell filling coefficient. The peculiarities of the modeled three-dimensional tank structure are described. There are pre- sented three-dimensional models of stepwise runup of the Surface Gravity wave upon a sloping shore.
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MATHEMATICAL MODELING THE RUNUP OF NONLINEAR Surface Gravity WAVES
International journal of pure and applied mathematics, 2013Co-Authors: Iftikhar B. AbbasovAbstract:This paper considers two-dimensional numerical simulation of the run-up of nonlinear Surface Gravity waves on the basis of Navier-Stokes equations. The statement of the problem is formulated and its boundary and initial conditions are described. A discrete model is constructed using the method of splitting with respect to physical processes. A discrete finite-element model of this problem is developed taking into account the cell fill factor. The conservativeness of the discrete model was investigated and the approximation error of the finite-difference scheme is found. The results of a two-dimensional numerical simulation of the run-up of nonlinear Surface Gravity waves on coastal structures of shallow-water offshore areas are presented.
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THREE DIMENSIONAL MODEL OF THE RUNUP OF NONLINEAR Surface Gravity WAVES ON THE SHALLOW WATER COASTAL SLOPE
Computational Continuum Mechanics, 2013Co-Authors: Iftikhar B. AbbasovAbstract:The paper is devoted to three-dimensional numerical modeling of a runup of nonlinear Surface Gravity waves based on Navier–Stokes equations. The three-dimensional formulation of the problem is considered, and the boundary and initial conditions are described. The decomposition method for physical processes is used to construct a discrete model capable of accounting for the factor of filled cells. Features of a design of the simulated three-dimensional shallow water area are described. Three-dimensional models of the staged runup of Surface Gravity waves on the coastal slope are presented. The wave processes occurring at the runup and back draft of nonlinear Surface Gravity waves are described.
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Numerical Simulation of Nonlinear Surface Gravity Waves Transformation under Shallow-Water Conditions
Applied Mathematics-a Journal of Chinese Universities Series B, 2012Co-Authors: Iftikhar B. AbbasovAbstract:This work considers the problems of numerical simulation of non-linear Surface Gravity waves transformation under shallow bay conditions. The discrete model is built from non-linear shallow-water equations. Are resulted boundary and initial conditions. The method of splitting into physical processes receives system from three equations. Then we define the approximation order and investigate stability conditions of the discrete model. The sweep method was used to calculate the system of equations. This work presents Surface Gravity wave profiles for different propagation phases.
Robert T. Guza - One of the best experts on this subject based on the ideXlab platform.
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Refraction of Surface Gravity waves by shear waves
Journal of Physical Oceanography, 2006Co-Authors: Stephen M. Henderson, Robert T. Guza, Steve Elgar, T. H. C. HerbersAbstract:Previous field observations indicate that the directional spread of swell-frequency (nominally 0.1 Hz) Surface Gravity waves increases during shoreward propagation across the surf zone. This directional broadening contrasts with the narrowing observed seaward of the surf zone and predicted by Snell’s law for bathymetric refraction. Field-observed broadening was predicted by a new model for refraction of swell by lower-frequency (nominally 0.01 Hz) current and elevation fluctuations. The observations and the model suggest that refraction by the cross-shore currents of energetic shear waves contributed substantially to the observed broadening.
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Field observations of orbital velocities and pressure in weakly nonlinear Surface Gravity waves
Journal of Fluid Mechanics, 1992Co-Authors: T. H. C. Herbers, R. L. Lowe, Robert T. GuzaAbstract:Field measurements of wave orbital velocities and pressure, collected in the lower part of the water column in 7 m depth with a three-component acoustic Doppler current meter and a co-located pressure transducer, are compared to the second-order theory for weakly nonlinear Surface Gravity waves in arbitrary water depth (Hasselmann 1962). Pressure and velocity spectra and cross-spectra are in excellent agreement with (linear) free wave transfer functions, even at (and higher than) twice the spectral peak frequency where nonlinearities (forced secondary waves) are expected to be important.
T. H. C. Herbers - One of the best experts on this subject based on the ideXlab platform.
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Refraction of Surface Gravity waves by shear waves
Journal of Physical Oceanography, 2006Co-Authors: Stephen M. Henderson, Robert T. Guza, Steve Elgar, T. H. C. HerbersAbstract:Previous field observations indicate that the directional spread of swell-frequency (nominally 0.1 Hz) Surface Gravity waves increases during shoreward propagation across the surf zone. This directional broadening contrasts with the narrowing observed seaward of the surf zone and predicted by Snell’s law for bathymetric refraction. Field-observed broadening was predicted by a new model for refraction of swell by lower-frequency (nominally 0.01 Hz) current and elevation fluctuations. The observations and the model suggest that refraction by the cross-shore currents of energetic shear waves contributed substantially to the observed broadening.
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Field observations of orbital velocities and pressure in weakly nonlinear Surface Gravity waves
Journal of Fluid Mechanics, 1992Co-Authors: T. H. C. Herbers, R. L. Lowe, Robert T. GuzaAbstract:Field measurements of wave orbital velocities and pressure, collected in the lower part of the water column in 7 m depth with a three-component acoustic Doppler current meter and a co-located pressure transducer, are compared to the second-order theory for weakly nonlinear Surface Gravity waves in arbitrary water depth (Hasselmann 1962). Pressure and velocity spectra and cross-spectra are in excellent agreement with (linear) free wave transfer functions, even at (and higher than) twice the spectral peak frequency where nonlinearities (forced secondary waves) are expected to be important.
John E Gizis - One of the best experts on this subject based on the ideXlab platform.
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wisep j004701 06 680352 1 an intermediate Surface Gravity dusty brown dwarf in the ab dor moving group
The Astrophysical Journal, 2015Co-Authors: John E Gizis, Katelyn N Allers, Michael C Liu, Hugh C Harris, Jacqueline K Faherty, Adam J Burgasser, Davy J KirkpatrickAbstract:We present spectroscopy, astrometry, and photometry of the brown dwarf WISEP J004701.06+680352.1 (W0047+68), an unusually red field L dwarf at a distance of 12.2 ± 0.4 pc. The three-dimensional space motion identifies it as a member of the AB Dor Moving Group, an identification supported by our classification of W0047+68 as intermediate Surface Gravity (INT-G) using the Allers & Liu near-infrared classification system. This moving group membership implies near-solar metallicity, age ~100-125 Myr, M ≈ 0.018 M_☉, and log g ≈ 4.5; the thick condensate clouds needed to explain the infrared spectrum are, therefore, a result of Surface Gravity that is lower than that of ordinary field brown dwarfs. From the observed luminosity and evolutionary model radius, we find T_(eff) ≈ 1300 K, a temperature normally associated with early T dwarfs. Thick clouds are also used to explain the spectral properties of directly imaged giant planets, and we discuss the successes and challenges for such substellar models in matching the observed optical and infrared spectra. W0047+68 shows that cloud thickness is more sensitive to intermediate Surface Gravity than in most models. We also present a trigonometric parallax of the dusty L6 dwarf 2MASS J21481628+4003593. It lies at 8.060 ± 0.036 parsecs; its astrometry is consistent with the view that it is older and metal-rich.
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wisep j004701 06 680352 1 an intermediate Surface Gravity dusty brown dwarf in the ab dor moving group
arXiv: Solar and Stellar Astrophysics, 2014Co-Authors: John E Gizis, Katelyn N Allers, Michael C Liu, Hugh C Harris, Jacqueline K Faherty, Adam J Burgasser, Davy J KirkpatrickAbstract:We present spectroscopy, astrometry, and photometry of the brown dwarf WISEP J004701.06+680352.1 (W0047+68), an unusually red field L dwarf at a distance of $12.2 \pm 0.4$ parsecs. The three-dimensional space motion identifies it as a member of the AB Dor Moving Group, an identification supported by our classification of W0047+68 as intermediate Surface Gravity (INT-G) using the Allers \& Liu (2013) near-infrared classification system. This moving group membership implies near-solar metallicity, age $\sim 100-125$ Myr, $M \approx 0.018~M_\odot$, and $\log g \approx 4.5$; the thick condensate clouds needed to explain the infrared spectrum are therefore a result of the lower Surface Gravity than ordinary field brown dwarfs. From the observed luminosity and evolutionary model radius, we find $T_{eff} \approx 1300 $K, a temperature normally associated with early T dwarfs. Thick clouds are also used to explain the spectral properties of directly imaged giant planets, and we discuss the successes and challenges for such substellar models in matching the observed optical and infrared spectra. W0047+68 shows that cloud thickness is more sensitive to intermediate Surface Gravity than in most models. We also present a trigonometric parallax of the dusty L6 dwarf 2MASS J21481628+4003593. It lies at $8.060 \pm 0.036$ parsecs; its astrometry is consistent with the view that it is older and metal-rich.
Eric Falcon - One of the best experts on this subject based on the ideXlab platform.
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Saturation of the inverse cascade in Surface Gravity-wave turbulence
Physical Review Letters, 2020Co-Authors: Eric Falcon, Guillaume Michel, Gaurav Prabhudesai, Annette Cazaubiel, Michaël Berhanu, Nicolas Mordant, Sébastien Aumaitre, F. BonnefoyAbstract:We report on the observation of Surface Gravity-wave turbulence at scales larger than the forcing ones in a large basin. In addition to the downscale transfer usually reported in Gravity-wave turbulence, an upscale transfer is observed, interpreted as the inverse cascade of weak turbulence theory. A steady state is achieved when the inverse cascade reaches a scale in between the forcing wavelength and the basin size, but far from the latter. This inverse cascade saturation, which depends on the wave steepness, is probably due to the emergence of nonlinear dissipative structures such as sharp-crested waves.
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Observation of resonant interactions among Surface Gravity waves
Journal of Fluid Mechanics, 2016Co-Authors: Félicien Bonnefoy, Guillaume Michel, Michaël Berhanu, Sébastien Aumaitre, Florence Haudin, Benoît Semin, Thomas Humbert, Eric FalconAbstract:We experimentally study resonant interactions of oblique Surface Gravity waves in a large basin. Our results strongly extend previous experimental results performed mainly for perpendicular or collinear wave trains. We generate two oblique waves crossing at an acute angle, while we control their frequency ratio, steepnesses and directions. These mother waves mutually interact and give birth to a resonant wave whose properties (growth rate, resonant response curve and phase locking) are fully characterized. All our experimental results are found in good quantitative agreement with four-wave interaction theory with no fitting parameter. Off-resonance experiments are also reported and the relevant theoretical analysis is conducted and validated.
