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Journal articles on the topic 'Transient wave propagation'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Kim, Hyun-Sil, and Jerry H. Ginsberg. "Transient Wave Propagation in a Harmonically Heterogeneous Elastic Solid." Journal of Applied Mechanics 59, no. 2S (June 1, 1992): S145—S151. http://dx.doi.org/10.1115/1.2899479.

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Transient propagation of a one-dimensional dilatational wave in a harmonically heterogeneous elastic solid is studied by several techniques. A regular perturbation analysis in terms of the characteristics of the differential equation shows that initiation of a temporally harmonic excitation that generates a signal whose wavelength is twice the periodicity of the heterogeneity leads to secularity in the first approximation. The frequency at which this situation occurs matches the frequency at which Floquet theory predicts that steady-state waves may be unstable. A finite difference algorithm based on integrating along the characteristics is developed and implemented to obtain a numerical solution. In the critical case, backscattering of the wave from the heterogeneity results in a mixture of propagating and standing wave features. However, rather than being unstable, the heterogeneity in this condition is shown to result in maximum interference with forward propagation. A comparable analysis for a step excitation on the boundary provides additional insight into the underlying propagation phenomena.

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2

Bakhoum, Ezzat G., and Cristian Toma. "Transient Aspects of Wave Propagation Connected with Spatial Coherence." Mathematical Problems in Engineering 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/691257.

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This study presents transient aspects of light wave propagation connected with spatial coherence. It is shown that reflection and refraction phenomena involve spatial patterns which are created within a certain transient time interval. After this transient time interval, these patterns act like a memory, determining the wave vector for subsequent sets of reflected/refracted waves. The validity of this model is based on intuitive aspects regarding phase conservation of energy for waves reflected/refracted by multiple centers in a certain material medium.

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3

Kristensson, G. "Transient electromagnetic wave propagation in waveguides." Journal of Electromagnetic Waves and Applications 9, no. 5-6 (January 1, 1995): 645–71. http://dx.doi.org/10.1163/156939395x00866.

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4

Park, Won Su, Joon Hyun Lee, and Youn Ho Cho. "Sub-Surface Crack Detection by Using Laser Induced Transient Stress Wave Propagation." Key Engineering Materials 297-300 (November 2005): 1992–97. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.1992.

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In this study we attempt to investigate the possibility of detecting sub-surface crack and the understanding of the propagating phenomena of transient stress waves due to impact in thick aluminum plate by the simultaneous measurement of longitudinal and shear creeping and Rayleigh wave resulted from the mode conversion of laser induced transient stress wave impact. The propagation of the transient stress wave generated by laser irradiation is affected by the sub-surface crack and the result is analyzed. It was observed that the longitudinal and shear creeping wave velocities are varied depending on the depth of sub-surface crack. In addition, the variation of amplitude ratio generated by propagating the stress wave is investigated. The longitudinal creeping wave velocity in the presence of the sub-surface crack is somewhat faster than in case of non-crack. And the shear creeping wave velocities represent large variations which are shown nearly 2nd order quadratic curve shape as the sub-surface crack depth increase under the same experimental condition. The results of this study are very useful for the nondestructive evaluation of the surface layer in thick structures by non-contact method and the opposing and the structures difficult to access.

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Miura, Kotaro, Makoto Sakamoto, and Yuji Tanabe. "Transient SH Wave Propagation of Elastic Plate." EPJ Web of Conferences 250 (2021): 02010. http://dx.doi.org/10.1051/epjconf/202125002010.

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We consider the transient wave propagation problem of linear, isotropic and elastic plate applied SH impact loading on the surface. Analytical solution of half-space obtained by the inverse Fourier-Laplace double transform using Cagniard-De Hoop method. The wave propagation problem of plate was considered by using a half-space exact solution and reflect wave from the boundary of plate are expressed using the image method. Some numerical results of stress and displacement components are presented. The mathematical technique appear in the basic problem can apply to the transient P wave propagation and more advanced problems.

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6

LIU, PHILIP L. F., and ALEJANDRO ORFILA. "Viscous effects on transient long-wave propagation." Journal of Fluid Mechanics 520 (December 10, 2004): 83–92. http://dx.doi.org/10.1017/s0022112004001806.

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7

Fa¨llstro¨m, K. E., and O. Lindblom. "Transient Bending Wave Propagation in Anisotropic Plates." Journal of Applied Mechanics 65, no. 4 (December 1, 1998): 930–38. http://dx.doi.org/10.1115/1.2791937.

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In this paper we study transient propagating bending waves. We use the equations of orthotropic plate dynamics, derived by Chow about 25 years ago, where both transverse shear and rotary inertia are included. These equations are extended to include anisotropic plates and an integral representation formula for the bending waves is derived. Chow’s model is compared with the classical Kirchoff’s model. We also investigate the influence of the rotary inertia. Comparisons with experimental data are made as well.

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8

Moura, André. "Causal analysis of transient viscoelastic wave propagation." Journal of the Acoustical Society of America 119, no. 2 (2006): 751. http://dx.doi.org/10.1121/1.2151769.

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9

Isaacson, M., K. F. Cheung, E. Mansard, and M. D. Miles. "Transient wave propagation in a laboratory flume." Journal of Hydraulic Research 31, no. 5 (September 1993): 665–80. http://dx.doi.org/10.1080/00221689309498778.

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10

LIU, Kaishin, Xin LI, and Shinji TANIMURA. "Transient Wave Propagation in Layered Orthotropic Plates." JSME International Journal Series A 42, no. 3 (1999): 328–33. http://dx.doi.org/10.1299/jsmea.42.328.

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11

Rossikhin, Yury A., and Marina V. Shitikova. "Transient wave propagation in Cosserat-type shells." Composites Part B: Engineering 163 (April 2019): 145–49. http://dx.doi.org/10.1016/j.compositesb.2018.11.037.

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12

Suryawanshi, Prakash, Sanjay Dambhare, and Ashutosh Pramanik. "Detection of Electromechanical Wave Propagation Using Synchronized Phasor Measurements." International Journal of Emerging Electric Power Systems 15, no. 1 (January 14, 2014): 69–75. http://dx.doi.org/10.1515/ijeeps-2013-0155.

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Abstract Considering electrical network as a continuum has become popular for electromechanical wave analysis. This paper reviews the concept of electromechanical wave propagation. Analysis of large number of generator ring system will be an easy way to illustrate wave propagation. The property of traveling waves is that the maximum and minimum values do not occur at the same time instants and hence the difference between these time delays can be easily calculated. The homogeneous, isotropic 10 generator ring system is modeled using electromagnetic transient simulation programs. The purpose of this study is to investigate the time delays and wave velocities using Power System Computer Aided Design (PSCAD)/Electromagnetic Transient Program (EMTP). The disturbances considered here are generator disconnections and line trips.

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13

Keller, Teddie L., Richard Rotunno, Matthias Steiner, and Robert D. Sharman. "Upstream-Propagating Wave Modes in Moist and Dry Flow over Topography." Journal of the Atmospheric Sciences 69, no. 10 (May 10, 2012): 3060–76. http://dx.doi.org/10.1175/jas-d-12-06.1.

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Abstract Previous studies have observed upstream-propagating modes in two-dimensional numerical simulations of idealized flow over topography with moist, nearly neutral conditions in the troposphere, topped by a stable stratosphere. The generation and propagation mechanisms for these modes were attributed to localized and dramatic changes in stability induced by the desaturation of the flow impinging on the mountain. In the present paper it is shown that these modes are transient upstream-propagating gravity waves, which are a fundamental feature of both moist and dry flow over topography of a two-layer troposphere–stratosphere atmospheric profile impulsively started from rest. The mode selection and propagation speeds of these transient waves are highly dependent on the tropospheric stability, as well as the wind speed and tropopause depth. In the moist case these modes appear to propagate according to an effective static stability that is intermediate to the normal dry stability and the lower moist stability. Comparisons with the linear, time-dependent, hydrostatic analytic solution show that these modes are similar to the transients observed in flow of a constant wind and stability layer over topography with a rigid upper boundary.

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14

Ishide, N., T. Urayama, K. Inoue, T. Komaru, and T. Takishima. "Propagation and collision characteristics of calcium waves in rat myocytes." American Journal of Physiology-Heart and Circulatory Physiology 259, no. 3 (September 1, 1990): H940—H950. http://dx.doi.org/10.1152/ajpheart.1990.259.3.h940.

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In myocytes, local contractions occur spontaneously and propagate as traveling waves. We observed the waves in myocytes as local changes in fura-2 fluorescence and determined some characteristics of the wave. Myocytes were enzymatically isolated from rat left ventricles and incubated with 2 microM fura-2/AM for 60 min. Microscopic fluorescence images of myocytes were recorded with a high-sensitivity video camera. The images were digitally analyzed, frame by frame, and temporal changes in local fluorescence were displayed. With the excitation wavelength at 380 nm, the darker band propagates as the traveling wave. With the excitation wavelength at 340 nm, the wave appears brighter. With the isosbestic wavelength at 360 nm, the wave is not discernible. The waves are thus considered to be traveling waves of change in local cytoplasmic calcium ion concentration (calcium wave). Velocity, amplitude, and width of the calcium waves appeared to be fairly constant during their propagation. When two waves propagating in opposite directions collided, summation of the waves did not occur. After the collision both waves disappeared. These observations support the idea that the waves propagate by inducing calcium release from adjacent sarcoplasmic reticulum. Phenomena observed during the collision indicate that there is a refractory period after the calcium transient; spatially, a refractory zone exists in the wake of the wave.

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15

Jalinoos, Farrokh, and J. E. White. "Wave propagation from an explosive source." GEOPHYSICS 51, no. 3 (March 1986): 746–56. http://dx.doi.org/10.1190/1.1442127.

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The model proposed describes the radiation of the primary seismic pulse from an explosive source. The model incorporates a viscous Voigt liquid in description of the nonelastic rock deformation that the explosion causes. The problem is solved in the frequency domain, followed by Fourier synthesis to obtain waveforms. Comparisons of the theoretical results with field data in three sedimentary environments of shale, sandstone, and marl indicate good quantitative agreements in shape and duration of transient pulses. Values of angular normal stress obtained at the deformed boundary suggest a dynamic tensile strength of rocks that decreased with duration of the tensile stress transient. The radius of the deformed zone (B) scales with the charge size Q approximately as [Formula: see text] where n is [Formula: see text] or larger.

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16

Song, Chang Geun, and Taekeun Oh. "Transient SU/PG modelling of discontinuous wave propagation." Progress in Computational Fluid Dynamics, An International Journal 16, no. 3 (2016): 146. http://dx.doi.org/10.1504/pcfd.2016.076221.

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17

Fridén, Jonas, Gerhard Kristensson, and Rodney D. Stewart. "Transient electromagnetic wave propagation in anisotropic dispersive media." Journal of the Optical Society of America A 10, no. 12 (December 1, 1993): 2618. http://dx.doi.org/10.1364/josaa.10.002618.

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18

ARAKAWA, Kazuo, and Takuo HAYASHI. "Transient wave propagation in an elastic layered medium." Transactions of the Japan Society of Mechanical Engineers Series A 54, no. 499 (1988): 476–80. http://dx.doi.org/10.1299/kikaia.54.476.

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19

Turhan, D., Z. Celep, and I. K. Zain-Edden. "Transient wave propagation in layered media conducting heat." Journal of Sound and Vibration 144, no. 2 (January 1991): 247–61. http://dx.doi.org/10.1016/0022-460x(91)90747-8.

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20

Karlsson, Anders, and Kevin Kreider. "Transient electromagnetic wave propagation in transverse periodic media." Wave Motion 23, no. 3 (May 1996): 259–77. http://dx.doi.org/10.1016/0165-2125(95)00053-4.

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21

Nkemzi, D., and W. A. Green. "Transient wave propagation in a viscoelastic sandwich plate." Acta Mechanica 102, no. 1-4 (March 1994): 167–82. http://dx.doi.org/10.1007/bf01178525.

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22

Tygel, Martin, and Peter Hubral. "Transient analytic point‐source response of a layered acoustic medium: Part I." GEOPHYSICS 50, no. 9 (September 1985): 1466–77. http://dx.doi.org/10.1190/1.1442014.

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The exact transient responses (e.g., reflection or transmission responses) of a transient point source above a stack of parallel acoustic homogeneous layers between two half‐spaces can be analytically obtained in the form of a finite integral strictly in the time domain. (The theory is presented in part II of this paper, this issue.) The transient acoustic potential of the point source is decomposed into transient plane waves, which are propagated through the layers at any angle of incidence as well in the time domain; finally, they are superposed to obtain the total point‐source response. The theory dealing with transient analytic plane wave propagation is described here. It constitutes an essential part of computing the synthetic seismogram by the new transient method proposed in part II. The plane‐wave propagation is achieved by an exact discrete recursion that automatically handles the conversion of homogeneous waves into inhomogeneous transient plane waves at layer boundaries. A particularly efficient algorithm is presented, that can be viewed as a natural extension of the popular normal‐incidence Goupillaud (1961)-type algorithm to the nonnormal incidence case.

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23

Sulisz, Wojciech, and Maciej Paprota. "Generation and propagation of transient nonlinear waves in a wave flume." Coastal Engineering 55, no. 4 (April 2008): 277–87. http://dx.doi.org/10.1016/j.coastaleng.2007.07.002.

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24

Hudspeth, Robert T. "Generation and propagation of transient nonlinear waves in a wave flume." Coastal Engineering 56, no. 8 (August 2009): 895–96. http://dx.doi.org/10.1016/j.coastaleng.2009.01.004.

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25

Portele, Tanja C., Andreas Dörnbrack, Johannes S. Wagner, Sonja Gisinger, Benedikt Ehard, Pierre-Dominique Pautet, and Markus Rapp. "Mountain-Wave Propagation under Transient Tropospheric Forcing: A DEEPWAVE Case Study." Monthly Weather Review 146, no. 6 (June 2018): 1861–88. http://dx.doi.org/10.1175/mwr-d-17-0080.1.

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The impact of transient tropospheric forcing on the deep vertical mountain-wave propagation is investigated by a unique combination of in situ and remote sensing observations and numerical modeling. The temporal evolution of the upstream low-level wind follows approximately a [Formula: see text] shape and was controlled by a migrating trough and connected fronts. Our case study reveals the importance of the time-varying propagation conditions in the upper troposphere and lower stratosphere (UTLS). Upper-tropospheric stability, the wind profile, and the tropopause strength affected the observed and simulated wave response in the UTLS. Leg-integrated along-track momentum fluxes ([Formula: see text]) and amplitudes of vertical displacements of air parcels in the UTLS reached up to 130 kN m−1 and 1500 m, respectively. Their maxima were phase shifted to the maximum low-level forcing by ≈8 h. Small-scale waves ([Formula: see text] km) were continuously forced, and their flux values depended on wave attenuation by breaking and reflection in the UTLS region. Only maximum flow over the envelope of the mountain range favored the excitation of longer waves that propagated deeply into the mesosphere. Their long propagation time caused a retarded enhancement of observed mesospheric gravity wave activity about 12–15 h after their observation in the UTLS. For the UTLS, we further compared observed and simulated [Formula: see text] with fluxes of 2D quasi-steady runs. UTLS momentum fluxes seem to be reproducible by individual quasi-steady 2D runs, except for the flux enhancement during the early decelerating forcing phase.

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26

Ivakhnik, V. V., and M. V. Savelyev. "Transient four-wave mixing in a transparent two-component medium." Computer Optics 42, no. 2 (July 24, 2018): 227–35. http://dx.doi.org/10.18287/2412-6179-2018-42-2-227-235.

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We analyze changes in the spatial structure of an object wave under four-wave mixing in a transparent two-component medium in schemes with opposing and concurrent pump waves. It is shown that in the spatial spectrum of the object wave there is a dip, whose position is determined by the propagation direction of the second pump wave. Angular rotation and frequency shift of the pump waves lead to a decrease in the conversion efficiency of high spatial frequencies. The bandwidth of the spatial frequencies cut out by the four-wave radiation converter decreases monotonically over time, whereas the bandwidth of the most efficiently converted spatial frequencies increases.

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27

Gubernov, Vladimir, Andrei Kolobov, Andrei Polezhaev, Harvinder Sidhu, and Geoffry Mercer. "Period doubling and chaotic transient in a model of chain-branching combustion wave propagation." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 466, no. 2121 (April 7, 2010): 2747–69. http://dx.doi.org/10.1098/rspa.2009.0668.

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The propagation of planar combustion waves in an adiabatic model with two-step chain-branching reaction mechanism is investigated. The travelling combustion wave becomes unstable with respect to pulsating perturbations as the critical parameter values for the Hopf bifurcation are crossed in the parameter space. The Hopf bifurcation is demonstrated to be of a supercritical nature and it gives rise to periodic pulsating combustion waves as the neutral stability boundary is crossed. The increase of the ambient temperature is found to have a stabilizing effect on the propagation of the combustion waves. However, it does not qualitatively change the behaviour of the travelling combustion waves. Further increase of the bifurcation parameter leads to the period-doubling bifurcation cascade and a chaotic regime of combustion wave propagation. The chaotic regime has a transient nature and the combustion wave extinguishes when the bifurcation parameter becomes sufficiently large. For Lewis numbers of fuel close to unity, the parameter regions where pulsating solutions exist become very close to each other and this makes it difficult to experimentally observe the period-doubling. It is shown that the average velocity of pulsating waves is less than the speed of the travelling wave for the same parameter values.

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28

Subrahmanyam, P. Bala, R. I. Sujith, and Tim C. Lieuwen. "Propagation of Sound in Inhomogeneous Media: Exact, Transient Solutions in Curvilinear Geometries." Journal of Vibration and Acoustics 125, no. 2 (April 1, 2003): 133–36. http://dx.doi.org/10.1115/1.1553471.

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Exact solutions for one-dimensional, transient acoustic wave propagation in curvilinear geometries with mean temperature variations are presented in this paper. These solutions are obtained by using a transformation of the spatial and acoustic variables in a manner suggested by the WKB approximation. The analysis is performed for spherical and cylindrical co-ordinate systems. Temperature profiles admitting exact traveling wave type solutions are derived. Although these solutions resemble the approximate, “high frequency,” WKB form of solution of the wave equation, they have the interesting property that they are exact, regardless of the scale of the acoustic disturbance relative to that of the inhomogeneity. Calculations showing the propagation of waves in cylindrical and spherical geometries are presented.

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29

Hassanzadeh, Siamak. "Acoustic modeling in fluid‐saturated porous media." GEOPHYSICS 56, no. 4 (April 1991): 424–35. http://dx.doi.org/10.1190/1.1443060.

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An acoustic modeling method with possible application to enhanced hydrocarbon reservoir characterization is presented. The method involves numerical simulation of two‐dimensional (2‐D), low‐frequency transient acoustic‐wave propagation in porous media and is based on the explicit finite‐difference formulation of Biot’s system of equations in a fluid‐saturated poroacoustic medium. The scheme is second‐order accurate in space and time. Synthetic seismograms computed using this approach indicate that transient acoustic‐wave propagation in unbounded fluid‐filled porous media and in the presence of fluid viscosity closely mimics that in an equivalent nonporous (single‐phase) solid. However, in the presence of heterogeneities, such as layering, inclusions, and discontinuities, the results show that acoustic‐wave characteristics are affected by spatial variations in reservoir parameters such as porosity, permeability, and fluid content as well as the fluid‐solid interaction. The effects of permeability and fluid viscosity are discernible in dispersion and dissipation of the compressional wave, whereas porosity affects the compressional velocity as well. The results of this study suggest that no equivalent single‐phase model can adequately describe the effects of permeability and porosity on seismic waves propagating through heterogeneous fluid‐filled porous media.

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30

GERMÈS, SYLVAIN, CHRISTOPHE STAWICKI, and DENIS AUBRY. "WAVE PROPAGATION THROUGH HOLLOW BODIES AND NOISE REDUCTION." Journal of Computational Acoustics 09, no. 03 (September 2001): 853–68. http://dx.doi.org/10.1142/s0218396x01000929.

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Low frequency noise (2–200 Hz) reduction in the passenger compartment has emerged in the past few years as a crucial subject of research in the car industry. This kind of noise is mainly due to the panels' vibrations, therefore our aim is to decrease the part of structural energy that reach them, i.e., we want to increase the part of energy that dissipates while propagating in the car body frame. This approach requires the understanding of structural wave propagation through the beam like structure (pillar, cross members…) as well as reflection and transmission at the structural joints. This is the physical problem that we want to address in this paper. Since car body frames are much too complex for physical understanding, we focused on simpler representative academic structures. We developed a numerical tool for the prediction and visualization of wave propagation, based on finite element models (FEM). Our FEM are first validated by comparison with experimental modal analysis, and then used for transient analysis. In both cases, the good agreement between calculations and experiments shows the reliability of our model and allows us to use it for wave propagation visualization. We illustrate our results by making a movie that helps to understand how waves propagate through a two hollow bodies junction.

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31

Lara, Javier L., Andrea Ruju, and Inigo J. Losada. "Reynolds averaged Navier–Stokes modelling of long waves induced by a transient wave group on a beach." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 467, no. 2129 (November 10, 2010): 1215–42. http://dx.doi.org/10.1098/rspa.2010.0331.

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This paper presents the numerical modelling of the cross shore propagation of infragravity waves induced by a transient focused short wave group over a sloping bottom. A dataset obtained through new laboratory experiments in the wave flume of the University of Cantabria is used to validate the Reynolds averaged Navier–Stokes type model IH-2VOF. A new boundary condition based on the wave maker movement used in the experiments is implemented in the model. Shoaling and breaking of short waves as well as the enhancement of long waves and the energy transfer to low-frequency motion are well addressed by the model, proving the high accuracy in the reproduction of surf zone hydrodynamics. Under the steep slope regime, a long wave trough is radiated offshore from the breakpoint. Numerical simulations conducted for different bottom slopes and short wave steepness suggest that this low-frequency breakpoint generated wave is controlled by both the bed slope parameter and the Iribarren number. Moreover, the numerical model is used to investigate the influence that a large flat bottom induces on the propagation pattern of long waves.

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32

Xiang-jun, Yu, Li Qing-hong, and Li Mao-lin. "Numerical Analysis of Wave Characteristic In the Freak Wave-- “New Year Wave” Formation." E3S Web of Conferences 290 (2021): 02013. http://dx.doi.org/10.1051/e3sconf/202129002013.

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Freak waves are both extremely large waves and highly transient time. Such a wave may lead to damage of ships to deaths. In this paper, to describe the connection between freak wave and wave essential factor, we use WAVEWATCH III model simulating “New Year Wave” in the North Sea to explore freak wave, with the importing of ECMWF re-analysis wind field. By this way, we successfully simulate the formation of freak wave in the random wave. Analysis shows large wave steepness and small directional spread angle are necessary conditions for freak waves to easily occur. By analyzing the wave spectrum, it is found that the wave energy is distributed in a small range, and the propagation direction is relatively concentrated.

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33

Egorov, Igor, Gerhard Kristensson, and Vaughan H. Weston. "Transient electromagnetic wave propagation in laterally discontinuous, dispersive media." Wave Motion 33, no. 1 (January 2001): 67–77. http://dx.doi.org/10.1016/s0165-2125(00)00064-0.

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34

Nagao, Kyohei, and Arata Masuda. "Transient wave propagation analysis of a pantograph- catenary system." Journal of Physics: Conference Series 744 (September 2016): 012086. http://dx.doi.org/10.1088/1742-6596/744/1/012086.

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35

Karlsson, Anders, Henrik Otterheim, and Rodney Stewart. "Transient wave propagation in composite media: Green’s function approach." Journal of the Optical Society of America A 10, no. 5 (May 1, 1993): 886. http://dx.doi.org/10.1364/josaa.10.000886.

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36

Molin, N. ‐E, and E. V. Jansson. "Transient wave propagation in wooden plates for musical instruments." Journal of the Acoustical Society of America 85, no. 5 (May 1989): 2179–84. http://dx.doi.org/10.1121/1.397866.

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37

Xie, S., and K. Liu. "Transient torsional wave propagation in a transversely isotropic tube." Archive of Applied Mechanics (Ingenieur Archiv) 68, no. 9 (November 6, 1998): 589–96. http://dx.doi.org/10.1007/s004190050189.

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38

Auriault, J. L. "Wave propagation and transient heat transfer in thermoelastic composites." International Journal of Heat and Mass Transfer 55, no. 21-22 (October 2012): 5972–78. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2012.06.007.

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39

Randow, C. L., and G. A. Gazonas. "Transient stress wave propagation in one-dimensional micropolar bodies." International Journal of Solids and Structures 46, no. 5 (March 2009): 1218–28. http://dx.doi.org/10.1016/j.ijsolstr.2008.10.024.

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40

Schanz, M., and A. H. D. Cheng. "Transient wave propagation in a one-dimensional poroelastic column." Acta Mechanica 145, no. 1-4 (March 2000): 1–18. http://dx.doi.org/10.1007/bf01453641.

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41

Kim, Ki-Tae, Lingbo Zhang, and Klaus-Jürgen Bathe. "Transient implicit wave propagation dynamics with overlapping finite elements." Computers & Structures 199 (April 2018): 18–33. http://dx.doi.org/10.1016/j.compstruc.2018.01.007.

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42

ABU ALSHAIKH, I., D. TURHAN, and Y. MENGI. "TWO-DIMENSIONAL TRANSIENT WAVE PROPAGATION IN VISCOELASTIC LAYERED MEDIA." Journal of Sound and Vibration 244, no. 5 (July 2001): 837–58. http://dx.doi.org/10.1006/jsvi.2000.3532.

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43

Park, Kyu Joo, Grant W. Hennig, Hyun-Tai Lee, Nick J. Spencer, Sean M. Ward, Terence K. Smith, and Kenton M. Sanders. "Spatial and temporal mapping of pacemaker activity in interstitial cells of Cajal in mouse ileum in situ." American Journal of Physiology-Cell Physiology 290, no. 5 (May 2006): C1411—C1427. http://dx.doi.org/10.1152/ajpcell.00447.2005.

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Spontaneous electrical pacemaker activity occurs in tunica muscularis of the gastrointestinal tract and drives phasic contractions. Interstitial cells of Cajal (ICC) are the pacemaker cells that generate and propagate electrical slow waves. We used Ca2+ imaging to visualize spontaneous rhythmicity in ICC in the myenteric region (ICC-MY) of the murine small intestine. ICC-MY, verified by colabeling with Kit antibody, displayed regular Ca2+ transients that occurred after electrical slow waves. ICC-MY formed networks, and Ca2+ transient wave fronts propagated through the ICC-MY networks at ∼2 mm/s and activated attached longitudinal muscle fibers. Nicardipine blocked Ca2+ transients in LM but had no visible effect on the transients in ICC-MY. β-Glycyrrhetinic acid reduced the coherence of propagation, causing single cells to pace independently. Thus, virtually all ICC-MYs are spontaneously active, but normal activity is organized into propagating wave fronts. Inhibitors of dihydropyridine-resistant Ca2+ entry (Ni2+ and mibefradil) and elevated external K+ reduced the coherence and velocity of propagation, eventually blocking all activity. The mitochondrial uncouplers, FCCP, and antimycin and the inositol 1,4,5-trisphosphate receptor-inhibitory drug, 2-aminoethoxydiphenyl borate, abolished rhythmic Ca2+ transients in ICC-MY. These data show that global Ca2+ transients in ICC-MYs are a reporter of electrical slow waves in gastrointestinal muscles. Imaging of ICC networks provides a unique multicellular view of pacemaker activity. The activity of ICC-MY is driven by intracellular Ca2+ handling mechanisms and entrained by voltage-dependent Ca2+ entry and coupling of cells via gap junctions.

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44

Ellis, John, Nick E. Mavromatos, and Dimitri V. Nanopoulos. "Remarks on graviton propagation in light of GW150914." Modern Physics Letters A 31, no. 26 (August 17, 2016): 1675001. http://dx.doi.org/10.1142/s0217732316750018.

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The observation of gravitational waves from the Laser Interferometer Gravitational-Wave Observatory (LIGO) event GW150914 may be used to constrain the possibility of Lorentz violation in graviton propagation, and the observation by the Fermi Gamma-Ray Burst Monitor (GBM) of a transient source in apparent coincidence may be used to constrain the difference between the velocities of light and gravitational waves: [Formula: see text].

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45

Frecentese, S., L. P. Argani, A. B. Movchan, N. V. Movchan, G. Carta, and M. L. Wall. "Waves and fluid–solid interaction in stented blood vessels." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 474, no. 2209 (January 2018): 20170670. http://dx.doi.org/10.1098/rspa.2017.0670.

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This paper focuses on the modelling of fluid–structure interaction and wave propagation problems in a stented artery. Reflection of waves in blood vessels is well documented in the literature, but it has always been linked to a strong variation in geometry, such as the branching of vessels. The aim of this work is to detect the possibility of wave reflection in a stented artery due to the repetitive pattern of the stents. The investigation of wave propagation and possible blockages under time-harmonic conditions is complemented with numerical simulations in the transient regime.

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46

Baudic, S. F., A. N. Williams, and A. Kareem. "A Two-Dimensional Numerical Wave Flume—Part 1: Nonlinear Wave Generation, Propagation, and Absorption." Journal of Offshore Mechanics and Arctic Engineering 123, no. 2 (January 25, 2001): 70–75. http://dx.doi.org/10.1115/1.1365117.

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A numerical model is developed to simulate fully nonlinear transient waves in a semi-infinite, two-dimensional wave tank. A mixed Eulerian-Lagrangian formulation is adopted and a high-order boundary element method is used to solve for the fluid motion at each time step. Input wave characteristics are specified at the upstream boundary of the computational domain using an appropriate wave theory. At the downstream boundary, a damping region is used in conjunction with a radiation condition to prevent wave reflections back into the computational domain. The convergence characteristics of the numerical model are studied and the numerical results are validated through a comparison with previous published data.

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47

Liu, Philip L. F. "Turbulent boundary-layer effects on transient wave propagation in shallow water." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 462, no. 2075 (June 6, 2006): 3481–91. http://dx.doi.org/10.1098/rspa.2006.1743.

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The depth-integrated continuity and momentum equations developed by Liu & Orfila are extended to include the effects of turbulent bottom boundary layer. The eddy viscosity model is employed in the boundary layer, in which the eddy viscosity is assumed to be a power function of the vertical elevation from the bottom. The leading-order effects of the turbulent boundary layer appear as a convolution integral in the depth-integrated continuity equation because of the boundary-layer displacement. The bottom stress is also expressed as a convolution integral of the depth-averaged horizontal velocity. For simple harmonic progressive waves, the analytical expression for the phase shift between the bottom stress and the depth-averaged velocity is obtained. The analytical solutions for the solitary wave damping rate due to a turbulent boundary layer are also derived. Prandtl's one-seventh power law is described in detail as an example.

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48

Chai, Yingbin, and Yongou Zhang. "Transient Wave Propagation Dynamics with Edge-Based Smoothed Finite Element Method and Bathe Time Integration Technique." Mathematical Problems in Engineering 2020 (July 31, 2020): 1–16. http://dx.doi.org/10.1155/2020/7180489.

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In this work, the edge-based smoothed finite element method (ES-FEM) is incorporated with the Bathe time integration scheme to solve the transient wave propagation problems. The edge-based gradient smoothing technique (GST) can properly soften the “overly soft” system matrices from the standard finite element approach; then, the spatial numerical dispersion error of the calculated solutions for wave problems can be significantly reduced. To effectively solve the transient wave propagation problems, the Bathe time integration scheme is employed to perform the involved time integration. Due to the appropriate “numerical dissipation effects” from the Bathe time integration method, the spurious oscillations in the relatively large wave numbers (high frequencies) can be effectively suppressed; then, the temporal numerical dispersion error in the calculated solutions can also be notably controlled. A number of supporting numerical examples are considered to examine the capabilities of the present approach. The numerical results show that ES-FEM works very well with the Bathe time integration technique, and much more numerical solutions can be reached for solving transient wave propagation problems compared to the standard FEM.

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Shevtsova, Maria, Evgenia Kirillova, Eugeny Rozhkov, Valery Chebanenko, Sergey Shevtsov, Jiing Kae Wu, and Shun Hsyung Chang. "Piezoelectric Based Lamb Waves Generation and Propagation in Orthotropic CFRP Plates: I. Influence of Material Damping." Materials Science Forum 962 (July 2019): 218–26. http://dx.doi.org/10.4028/www.scientific.net/msf.962.218.

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The article investigates the Lamb wave generation by the surface bonded circular actuator and wave propagation within the orthotropic Carbon Fiber Reinforced Plastic (CFRP) plate considering the anisotropy of the material elastic and damping properties. The first part of our investigation includes experimental determination of the elastic properties of CFRP, the wave attenuation, determination of the waves type that can be excited in the studied CFRP panel using a given frequency range. The model of anisotropic material damping has been proposed, which was further used in the Finite Element (FE) implementation of transient wave generation, propagation and attenuation that is present in the second part of the reported study. The proposed results can be used at the design of SHM for the composite structures with the structural anisotropy and damping, and for making a reasonable choice of the frequency and amplitude of excitation to provide the desired propagation distance and orientation of generated waves.

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Sansalone, M., N. J. Carino, and N. N. Hsu. "A finite element study of transient wave propagation in plates." Journal of Research of the National Bureau of Standards 92, no. 4 (July 1987): 267. http://dx.doi.org/10.6028/jres.092.025.

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