Relevant bibliographies by topics / Focusing wave

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Academic literature on the topic 'Focusing wave'

Author: Grafiati
Published: 13 April 2023

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Journal articles on the topic "Focusing wave"

1

Murray, D. R., and P. Öhberg. "Matter wave focusing." Journal of Physics B: Atomic, Molecular and Optical Physics 38, no. 8 (2005): 1227–34. http://dx.doi.org/10.1088/0953-4075/38/8/012.

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2

Xu, Guochun, Hongbin Hao, Qingwei Ma, and Qinqin Gui. "An Experimental Study of Focusing Wave Generation with Improved Wave Amplitude Spectra." Water 11, no. 12 (2019): 2521. http://dx.doi.org/10.3390/w11122521.

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We experimentally investigate the generating results of space-time focusing waves based on two new wave spectra, i.e., the quasi constant wave amplitude spectrum (QCWA) and the quasi constant wave steepness spectrum (QCWS), in which amplitude and steepness for each wave component can be adjusted with fixed wave energy. The wavemaker signal consists of a theoretical wavemaker motion signal and two different auxiliary functions at two ends of the signal. By testing a series of focusing waves in a physical wave tank, we found that with given wave energy, the QCWA spectrum can produce a focusing wave with larger crest elevation and farther focusing location from the wavemaker flap, as compared with the QCWS spectrum. However, both spectra lead to larger focusing wave crests when the wave frequency bandwidth was narrowed down and a positive correlation between the generated relative wave crest elevation and the input wave elevation parameter. The two spectra produce different focusing wave positions for the same wave frequency range. We also found that the focusing time strongly relates to the energy of the highest-frequency wave component of the wave spectrum.
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3

Smit, Pieter Bart, T. T. Janssen, and T. H. C. Herbers. "TOPOGRAPHY-INDUCED FOCUSING OF RANDOM WAVES." Coastal Engineering Proceedings 1, no. 33 (2012): 6. http://dx.doi.org/10.9753/icce.v33.waves.6.

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Refraction of narrow-band surface waves in coastal areas can result in wave-focal zones where due to interference, wave statistics vary rapidly and on similar length scales as those of individual waves. However such interference patterns, or wave coherence, are not accounted for in conventional stochastic wave models that are based on the energy balance equation or radiative transfer equation. In this work we present a quasi-coherent theory, which is an extension of the radiative transfer equation and quasi-homogeneous theory. We show that this new stochastic modelling approach can resolve rapid variations in wave statistics that occur in the vicinity of a wave caustic. The results compare favourably to those obtained from ensemble averages calculated with a deterministic phase resolving model (SWASH) and, in a focal zone, constitute a significant improvement over those obtained with a conventional stochastic wave model based on an energy balance equation (SWAN).
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4

Vogel, K., F. Gleisberg, N. L. Harshman, et al. "Optimally focusing wave packets." Chemical Physics 375, no. 2-3 (2010): 133–43. http://dx.doi.org/10.1016/j.chemphys.2010.07.002.

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5

Chen, Jinbing, and Dmitry E. Pelinovsky. "Rogue periodic waves of the focusing nonlinear Schrödinger equation." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 474, no. 2210 (2018): 20170814. http://dx.doi.org/10.1098/rspa.2017.0814.

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Rogue periodic waves stand for rogue waves on a periodic background. The nonlinear Schrödinger equation in the focusing case admits two families of periodic wave solutions expressed by the Jacobian elliptic functions dn and cn . Both periodic waves are modulationally unstable with respect to long-wave perturbations. Exact solutions for the rogue periodic waves are constructed by using the explicit expressions for the periodic eigenfunctions of the Zakharov–Shabat spectral problem and the Darboux transformations. These exact solutions generalize the classical rogue wave (the so-called Peregrine’s breather). The magnification factor of the rogue periodic waves is computed as a function of the elliptic modulus. Rogue periodic waves constructed here are compared with the rogue wave patterns obtained numerically in recent publications.
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6

Zhang, Zhen Fu, Xin Wu Zeng, Qing Yu Cai, and Kai Feng Han. "Numerical Simulation on Underwater Shock Wave Focusing." Applied Mechanics and Materials 105-107 (September 2011): 121–26. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.121.

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Shock wave focusing by an ellipsoidal reflector can produce higher pressure in the focal region. The focusing process of shock wave was studied by theory analyses and numerical results. Base on the experimental observation the shock wave source is equivalent to the explosion of an underwater explosive. A finite element model was set up to investigate the shock wave focusing behaviors. Both the pressure-time history and the peak pressure along the axial position were presented. The shock wave focusing process was shown. The interactions of waves in the focal region are shown. A modified EOS of water was applied, which can be used to analyze the negative pressure observed; the numerical results based on the modified EOS agree well with the experimental data.
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7

Merkoune, D., J. Touboul, N. Abcha, D. Mouazé, and A. Ezersky. "Focusing wave group on a current of finite depth." Natural Hazards and Earth System Sciences 13, no. 11 (2013): 2941–49. http://dx.doi.org/10.5194/nhess-13-2941-2013.

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Abstract. Formation of freak waves resulting from the wave packets propagating in finite water depth on the background of a current is studied experimentally and numerically. In the experiment, the freak waves appear as a result of dispersion focusing of wave train excited by wave maker with modulated frequency. The space evolution of the frequency modulated train is studied in numerical simulations. We showed that in the water of finite depth, a distance of focusing increases and amplitude in the focal point decreases in comparison with infinite water depth. Experimental results are in good agreement with numerical simulations if wave breaking of surface waves does not occur.
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8

Zhou, Binzhen, Kanglixi Ding, Jiahao Wang, Lei Wang, Peng Jin, and Tianning Tang. "Experimental study on the interactions between wave groups in double-wave-group focusing." Physics of Fluids 35, no. 3 (2023): 037118. http://dx.doi.org/10.1063/5.0142042.

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Nonlinear interactions in wave-group focusing are regarded as one of the main mechanisms in the generation of destructive extreme waves. In real seas, the wideband bimodal state is a typical configuration, containing interactions within a single wave group and between different wave groups. The former has been well uncovered under the assumption of narrow bandwidth, but the latter is poorly understood. In this paper, physical experiments are conducted to reveal the physics of double-wave-group focusing considering various energy distributions. Superposed wavemaker signals generated by the iteration method are applied to produce a double-wave-group focusing with the interactions being decomposed. Results of the wavelet-based bicoherence spectrum show that double-wave-group focusing is distinguished from the linear superposition of two single-wave-group focusing mainly in the nonlinear interactions induced by the second-order sum harmonics. Under the assumption of equivalent energy, interactions of the second-order sum harmonics between the lower frequency group and higher frequency group cannot be ignored in swell-dominated states, and lesser linear interactions and stronger nonlinear interactions are observed while the spectral distribution of the double-wave-group is more asymmetrical. This work is anticipated to contribute to the understanding of the generation mechanism of extreme waves driven by strong nonlinearity.
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9

Liu, Mao, Haijie Yu, and Ben Wang. "Tuning and controlling antiplane shear wave propagation in elastic membranes." AIP Advances 12, no. 8 (2022): 085319. http://dx.doi.org/10.1063/5.0103469.

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In this paper, a rotary-focusing device for the antiplane shear wave is constructed to control and guide elastic wave energy transmission in elastic membranes. The designed device can cloak the antiplane shear waves outside the device and has a rotary-focusing effect on the shear waves energy inside the device in a membrane. The multilayered isotropic material properties of the rotary-focusing device are derived based on the transformation and rotary medium method, and a rotation parameter to guide the propagating trajectories of the antiplane shear waves is introduced. The efficiency of the rotary-focusing device for the antiplane shear waves is verified. The stability of shear wave fields in a membrane with the rotary-focusing device is analyzed to study the performance of rotary-focusing. Numerical examples show that the constructed rotary-focusing device for antiplane shear waves can effectively rotate and focus the antiplane shear wave energy into the device for a wide range of exciting frequencies, which can enhance the antiplane shear energy. Therefore, this study can provide theoretical support for potential applications in the fields of energy harvesting and vibration control.
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10

Vines, R. E., Shin-ichiro Tamura, and J. P. Wolfe. "Surface Acoustic Wave Focusing and Induced Rayleigh Waves." Physical Review Letters 74, no. 14 (1995): 2729–32. http://dx.doi.org/10.1103/physrevlett.74.2729.

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