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Статті в журналах з теми "Simulation of the wave process"

Автор: Grafiati

Опубліковано: 28 травня 2022

Оновлено: 31 липня 2025

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1

Sun, Xiaofeng, Miaoyu Cai, Jingkui Wang, and Chunlei Liu. "Numerical Simulation of the Kelvin Wake Patterns." Applied Sciences 12, no. 12 (2022): 6265. http://dx.doi.org/10.3390/app12126265.

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The ship wave is of great interest for wave drag and coastal erosion. This paper proposes a mechanism of ship wave transformation to explore the effects of ship speed and ship size on the waveform. Firstly, based on the theory of potential flow, the boundary integral equations for the Kelvin ship waves are obtained by deploying the different Kelvin sources or Rankine sources. Then, these integral equations are numerically discretized to a set of nonlinear equations. Finally, the Jacobian−free Newton–Krylov method with a preconditioner is adopted to solve the nonlinear equations. Though imitati

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2

Kong, Congying, and Hao Liu. "Numerical simulation of wave spectrum during a typhoon." E3S Web of Conferences 290 (2021): 02019. http://dx.doi.org/10.1051/e3sconf/202129002019.

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The third-generation wave model WAVEWATCH-III was used to numerically simulate the wave under the influence of a typhoon in the coastal area of China. The wave spectrum at the buoy point was output, and the characteristics of the wave spectrum were analyzed. The change of the wave spectrum during the typhoon process reflected the growth process of typhoon formation, development and extinction. The relationship between the wave spectrum and the wind direction was intuitively shown by the directional spectrum, indicating the coexistence of wind waves and swells in the sea area during the typhoon

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3

Ha, Yoon-Jin, Ji-Yong Park, and Seung-Ho Shin. "Numerical Study of Non-Linear Dynamic Behavior of an Asymmetric Rotor for Wave Energy Converter in Regular Waves." Processes 9, no. 8 (2021): 1477. http://dx.doi.org/10.3390/pr9081477.

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This study conducted a numerical investigation on the non-linear motion problems between a Salter duck-type rotor and large waves using CFD simulations. Regular waves of five different wave heights were generated. First, the linear motion of the rotor from the CFD simulation was verified by comparing it with the existing experimental and frequency domain analysis results. Then, a series of CFD simulations were performed to investigate the non-linear motions of the rotor. In the case of a lower wave height, the CFD simulation results were in good agreement with the experimental and frequency do

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4

Li, Jiangyu, Shaoqing Zhang, Qingxiang Liu, Xiaolin Yu, and Zhiwei Zhang. "Design and evaluation of an efficient high-precision ocean surface wave model with a multiscale grid system (MSG_Wav1.0)." Geoscientific Model Development 16, no. 21 (2023): 6393–412. http://dx.doi.org/10.5194/gmd-16-6393-2023.

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Abstract. Ocean surface waves induced by wind forcing and topographic effects are a crucial physical process at the air–sea interface, which significantly affect typhoon development, ocean mixing, etc. Higher-resolution wave modeling can simulate more accurate wave states but requires a huge number of computational resources, making it difficult for Earth system models to include ocean waves as a fast-response physical process. Given that high-resolution Earth system models are in demand, efficient high-precision wave simulation is necessary and urgent. Based on the wave dispersion relation, w

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5

Hu, Xuan, and Azhar Halik. "Numerical simulation of freak wave generation and evolution process based on SPH method." Journal of Physics: Conference Series 2756, no. 1 (2024): 012057. http://dx.doi.org/10.1088/1742-6596/2756/1/012057.

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Abstract With the occurrence of maritime accidents all over the world, the study of extreme waves has been promoted. These extreme waves are often called freak waves in the scientific community. At present, a variety of mechanisms are proposed to explain freak waves in the marine environment, such as directional focusing, dispersive focusing, and nonlinear modulation instability. At first, a hydrodynamic model is established based on the Smoothed Particle Hydrodynamics (SPH) method in the C# environment, and the regular wave generated by the piston wave generator is numerically simulated. Seco

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6

Ganesh Korwar. "Construction Of Ocean Wave Generator Test Rig for Wave Energy Harvesting." Communications on Applied Nonlinear Analysis 32, no. 1s (2024): 521–27. http://dx.doi.org/10.52783/cana.v32.2294.

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This study focuses on developing and enhancing a Wave Generator Mechanism utilizing the Scotch yoke mechanism for simulating waves. The research investigates the incorporation of a carefully designed artificial slope into the Scotch yoke system, shedding light on its practical use and effectiveness in mimicking wave patterns. The paper outlines the detailed methodology and production process, analysing the essential components, materials, and factors necessary for precise wave simulation. Through experimentation, it is demonstrated that waves can be successfully generated in a controlled setti

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7

Umeda, T. "Vlasov simulation of Langmuir wave packets." Nonlinear Processes in Geophysics 14, no. 5 (2007): 671–79. http://dx.doi.org/10.5194/npg-14-671-2007.

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Abstract. Amplitude modulation and packet formation of Langmuir waves are commonly observed during a nonlinear interaction between electron beams and plasmas. In this paper, we briefly review the history of Langmuir wave packets as developed by recent spacecraft observations and computer simulations. New one-dimensional electrostatic Vlasov simulations are performed to study their formation processes. It is found that the formation of Langmuir wave packets involves both an incoherent turbulent process and a coherent nonlinear trapping process. Existence of cold ions does not affect nonlinear p

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8

Chakraborty, Samarpan, and Balakumar Balachandran. "Wave Propagation Studies in Numerical Wave Tanks with Weakly Compressible Smoothed Particle Hydrodynamics." Journal of Marine Science and Engineering 9, no. 2 (2021): 233. http://dx.doi.org/10.3390/jmse9020233.

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Generation and propagation of waves in a numerical wave tank constructed using Weakly Compressible Smoothed Particle Hydrodynamics (WCSPH) are considered here. Numerical wave tank simulations have been carried out with implementations of different Wendland kernels in conjunction with different numerical dissipation schemes. The simulations were accelerated by using General Process Graphics Processing Unit (GPGPU) computing to utilize the massively parallel nature of the simulations and thus improve process efficiency. Numerical experiments with short domains have been carried out to validate t

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9

Taylor, P. H., P. Jonathan, and L. A. Harland. "Time Domain Simulation of Jack-up Dynamics With the Extremes of a Gaussian Process." Journal of Vibration and Acoustics 119, no. 4 (1997): 624–28. http://dx.doi.org/10.1115/1.2889772.

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Random simulations are often used to simulate the statistics of storm-driven waves. Work on Gaussian linear random signals has lead to a method for embedding a large wave into a random sequence in such a way that the composite signal is virtually indistinguishable (in a rigorous statistical limit) from a purely random occurrence of a large wave. We demonstrate that this idea can be used to estimate the extreme response of a jack-up in a severe sea-state in a robust and efficient manner. Results are in good agreement with those obtained from a full random time-domain simulation.

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10

Hu, Xiaozhou, Yiyao Jiang, and Daojun Cai. "Numerical Modeling and Simulation of Wave Impact of a Circular Cylinder during the Submergence Process." Modelling and Simulation in Engineering 2017 (2017): 1–14. http://dx.doi.org/10.1155/2017/2197150.

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Wave slamming loads on a circular cylinder during water entry and the subsequence submergence process are predicted based on a numerical wave load model. The wave impact problems are analyzed by solving Reynolds-Averaged Navier-Stokes (RANS) equations and VOF equations. A finite volume approach (FV) is employed to implement the discretization of the RANS equations. A two-dimensional numerical wave tank is established to simulate regular ocean waves. The wave slamming problems are investigated by deploying a circular cylinder into waves with a constant vertical velocity. The present numerical m

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11

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

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12

Xiang, Gong, and C. Guedes Soares. "Incorporating irregular nonlinear waves in simulation of dropped cylindrical objects." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 234, no. 1 (2019): 272–83. http://dx.doi.org/10.1177/1475090218825170.

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This study investigates the use of second-order irregular waves for estimating loads on dropped objects. The theory for the irregular nonlinear wave model is integrated into a motion prediction model to simulate the falling process of a dropped cylinder under irregular waves. Through frequency analysis, the simulated irregular waves are transformed into wave spectrum by fast Fourier transform and compared with the target wave spectrum. A good agreement between simulated wave spectrum and target wave spectrum indicates the validity of the irregular nonlinear wave model. The effects of cylinder

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13

Chalikov, Dmitry, and Alexander V. Babanin. "Simulation of Wave Breaking in One-Dimensional Spectral Environment." Journal of Physical Oceanography 42, no. 11 (2012): 1745–61. http://dx.doi.org/10.1175/jpo-d-11-0128.1.

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Abstract Results of numerical investigations, based on full dynamic equations, are presented for wave breaking in a one-dimensional environment with a wave spectrum. The breaking is defined as a process of irreversible collapse of an individual wave in physical space, and the incipient breaker is a wave that reached a dynamic condition of the limiting stability where the collapse has not started yet but is inevitable. The main attention is paid to documenting the evolution of different wave characteristics before the breaking commences. It is shown that the breaking is a localized process that

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14

Irisov, Vladimir, and Alexander Voronovich. "Numerical Simulation of Wave Breaking." Journal of Physical Oceanography 41, no. 2 (2011): 346–64. http://dx.doi.org/10.1175/2010jpo4442.1.

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Abstract The wave breaking events in a continuous spectrum of surface gravity waves are investigated numerically in 2D within a framework of the potential motion model. It is claimed that the major physical mechanism leading to wave breaking is “squeezing” of relatively short waves by the surface currents due to longer waves (the “concertina” effect), which causes the shorter waves to steepen and become unstable. It is demonstrated that locations of the breaking events are well correlated with the maximum of local current convergence, although slightly worse correlation of the locations with t

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15

Idris, Ahmad, Indra Sati Hamonangan Harahap, and Montasir Osman Ahmed Ali. "Simplified Computer Program for Ocean Wave Simulation." International Journal of Engineering & Technology 7, no. 4.38 (2018): 1384. http://dx.doi.org/10.14419/ijet.v7i4.38.27880.

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Analysis and design of structures located offshore involves the simulation of the ocean wave process in order to select a design load. This is a rigorous process that involves the solution of difficult mathematical equations. This study presents an efficient computer program for the simulation of the wave. The program was designed in such a way that only the wave parameters for a given location are required as input. The program then simulate the wave using Karhunen-Loeve series representation in which the eigenfunctions of Prolate Spheroidal Wave Functions are developed and used. The use of t

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16

Flamarion, M. V., E. Kochurin, and R. Ribeiro-Jr. "Fully Nonlinear Evolution of Free-Surface Waves with Constant Vorticity under Horizontal Electric Fields." Mathematics 11, no. 21 (2023): 4467. http://dx.doi.org/10.3390/math11214467.

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This work presents the results of a direct numerical simulation of the nonlinear free surface evolution of a finite-depth fluid with a linear shear flow under the action of horizontal electric fields. The method of time-dependent conformal transformation for the description of the combined effects of the electric fields and constant vorticity is generalized for the first time. The simulation results show that strong shear flow co-directed in the wave propagation direction leads to the formation of large-amplitude surface waves, and, for some limiting vorticity value, a wave breaking process wi

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17

Jingbo, Su, Zhu Feng, Geng Ying, and Ni Xingye. "Numerical Study of Wave Overtopping Based on Local Method of Approximate Particular Solution Method." Advances in Mechanical Engineering 6 (January 1, 2014): 541717. http://dx.doi.org/10.1155/2014/541717.

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In order to study the wave overtopping process, this paper establishes a two-dimensional numerical wave flume based on a meshless algorithm, local method of approximate particular solution (the LMAPS method), and the technology of momentum source wave. It calculates the climbing and overtopping process under regular waves on a typical slope, results of which are more consistent with the physical model test results. Finally, wave action simulation is carried out on six different structural forms of wave walls (vertical wave wall, 1/4 arc wave wall, reversed-arc wave wall, smooth surface wave wa

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18

Lv, Xiang Cui, Dao Sheng Wang, De Kui Yuan, and Jian Hua Tao. "Calibration of SWAN Model for Wave Simulation in Bohai Sea." Applied Mechanics and Materials 423-426 (September 2013): 1344–50. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.1344.

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It is necessary to obtain a further understanding of the behaviors and characteristics of water waves in the Bohai Sea for the coastal engineering construction and environment protection in this area. The SWAN (Simulating Waves Nearshore) model, a third-generation wave spectral model on the basis of wave action conservation has been applied to study the water waves in the Bohai Sea by several researchers, and encouraging results have been obtained. However, the calibrated parameter for a wave process at an individual station does not have universal applicability for other stations, which causi

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19

Hristov, Nebojša, Aleksandar Kari, Damir Jerković, Slobodan Savić, and Radoslav Sirovatka. "Simulation and Measurements of Small Arms Blast Wave Overpressure in the Process of Designing a Silencer." Measurement Science Review 15, no. 1 (2015): 27–34. http://dx.doi.org/10.1515/msr-2015-0005.

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Abstract Simulation and measurements of muzzle blast overpressure and its physical manifestations are studied in this paper. The use of a silencer can have a great influence on the overpressure intensity. A silencer is regarded as an acoustic transducer and a waveguide. Wave equations for an acoustic dotted source of directed effect are used for physical interpretation of overpressure as an acoustic phenomenon. Decomposition approach has proven to be suitable to describe the formation of the output wave of the wave transducer. Electroacoustic analogies are used for simulations. A measurement c

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20

Zhao, Ning, Xiaolong Li, Liuliu Peng, Zhilong Xu, Xiaowei Chen, and Xuewei Wang. "Influence of Phases of Coherence Functions on the Wind Field Simulation Using Spectral Representation Method." Applied Sciences 12, no. 16 (2022): 8190. http://dx.doi.org/10.3390/app12168190.

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The wave passage effect is a measure of the wave passage delay due to the apparent velocity of waves, which is one of spatially varying properties of multivariate random processes. The phase of coherence function reflects the wave passage effect of wind fields. In the wind field, simulation by the spectral representation method, the classical phase formula, is not rigorous. This may affect the accuracy of simulation results and even cause incorrect simulations. In this study, the influences of the phase on stationary and nonstationary wind field simulations are researched and discussed in deta

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21

Argudo, Marcos Martínez, Shiva Hajitabarmarznaki, Divya J. Prakash, et al. "Amplification of THz waves by beam-wave interaction in self-assembled helical slow-wave structures with single and double chirality." AIP Advances 12, no. 8 (2022): 085121. http://dx.doi.org/10.1063/5.0100344.

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We investigate the interaction between an electron beam and a THz guided electromagnetic wave in a helical slow-wave structure formed by self-assembly of a conductive ribbon. We have previously shown the controlled fabrication of this slow-wave structure and its potential to form the basis for widely deployable millimeter-through-THz traveling-wave tube amplifiers. The process allows the fabrication of helical slow-wave structures with single and double chirality. Here, we use three-dimensional simulations to perform a comparative analysis of beam–wave interaction in self-assembled gold helice

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22

Ming, Eryang, Cong Li, Huiqing Lan, Jiaqing Yu, Lichen Zheng, and Xiaohan Pei. "Modelling Wave Transmission for Transient Flow and Amplitude-Frequency Characteristics of Tubular String in a Water Injection Well." Applied Sciences 13, no. 6 (2023): 3917. http://dx.doi.org/10.3390/app13063917.

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Fluid wave code communication is used in layered water injection intelligent monitoring systems, but a model of fluid transient flow wave signal transmission is still unknown. Impedance and transfer coefficient in power transmission theory were used to describe transient flow waves in the transmission process of a tubular string in a water injection well and a transient flow wave model was built based on the transfer matrix method. The relationship between pressure and discharge was analyzed when the transient flow waves moved along the tubular string, and the influence of terminal impedance a

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23

Hagino, Naoto, Seiji Komiya, Jinichi Endou, and Masao Ishihama. "Ultrasonic Wave Propagation Analysis for In-Process Monitoring of Stamping." Key Engineering Materials 716 (October 2016): 528–35. http://dx.doi.org/10.4028/www.scientific.net/kem.716.528.

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The servo press has high potential for producing high precision mechanical parts. However, small gaps between dies and workpieces tend to exist even in servo press stamping, and the potential of the servo press has not yet been fully utilized. The reason for this is conventional presses do not have feedback control systems, and the lack of a suitable method of sensing contact information in real time causes deterioration in the accuracy of products. If slide motion could be controlled by contact information, the small gaps could be removed. To solve this problem, the authors have developed a m

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24

Jiang, Ting, Fan Wang, Xin-ying Li, and Xiao-long Zheng. "Research on Wind Wave Simulation Technology based on Potential Flow Theory." Journal of Physics: Conference Series 2381, no. 1 (2022): 012003. http://dx.doi.org/10.1088/1742-6596/2381/1/012003.

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Abstract The wave environment is the main service environment of surface aircraft in the process of surface duty. In order to comprehensively study the operating characteristics of aircraft under this condition, it is necessary to conduct research on wave parameter modeling methods and simulation technology based on different wave conditions. This paper adopts the three-dimensional potential theory and ball model to calculate the different wave cases. A high-precision numerical simulation method of complex sea conditions is formed by mastering the numerical wave-making technology of typical re

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25

Nagaso, Masaru, Joseph Moysan, Christian Lhuillier, and Jean-Philippe Jeannot. "Simulation of Fluid Dynamics Monitoring Using Ultrasonic Measurements." Applied Sciences 11, no. 15 (2021): 7065. http://dx.doi.org/10.3390/app11157065.

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The simulation of the propagation of ultrasonic waves in a moving fluid will improve the efficiency of the ultrasonic flow monitoring and that of the in-service monitoring for various reactors in several industries. The most recent simulations are mostly limited to 3D representations of the insonified volume but without really considering the temporal aspect of the flow. The advent of high-performance computing (HPC) now makes it possible to propose the first 4D simulations, with the representation of the inspected medium evolving over time. This work is based on a highly accurate double simul

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26

Zülicke, Christoph, and Dieter Peters. "Simulation of Inertia–Gravity Waves in a Poleward-Breaking Rossby Wave." Journal of the Atmospheric Sciences 63, no. 12 (2006): 3253–76. http://dx.doi.org/10.1175/jas3805.1.

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Poleward-breaking Rossby waves often induce an upper-level jet streak over northern Europe. Dominant inertia–gravity wave packets are observed downstream of this jet. The physical processes of their generation and propagation, in such a configuration, are investigated with a mesoscale model. The study is focused on an observational campaign from 17 to 19 December 1999 over northern Germany. Different simulations with the fifth-generation Pennsylvania State University–National Center for Atmospheric Research (PSU–NCAR) Mesoscale Model (MM5) have been performed. For a high-resolution process stu

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27

Wang, Xu Sheng, Lian Hai Wang, Xiu Fu Song, and Bo Ning. "3D Wave Simulation Basing on VOF Method and Dynamic Grid Technology." Advanced Materials Research 774-776 (September 2013): 344–46. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.344.

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In order to investigate 3-D situation, the wind and the waves on the interaction on the influence of water object characteristics, this article through to the second development software Fluent, numerical simulation for 3D wave the dynamic process of the wave. First of all a three dimensional two phase numerical pool, the definition made wave plate boundary for movement, according to the characteristics of sine wave launch made wave plate movement rules, and through the user-defined function (UDF) DEFINE_CG_MOTION macro, realize the made the movement of wave plate, analyzes the cycle 2 s strok

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28

Kalaee, M. J., Y. Katoh, A. Kumamoto, T. Ono, and Y. Nishimura. "Simulation of mode conversion process from upper-hybrid waves to LO-mode waves in the vicinity of the plasmapause." Annales Geophysicae 28, no. 6 (2010): 1289–97. http://dx.doi.org/10.5194/angeo-28-1289-2010.

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Abstract. In order to clarify the role of the mode conversion process in the generation mechanism of LO-mode waves in the equatorial region of the plasmasphere, we have investigated the linear mode conversion process among upper-hybrid-resonance (UHR)-mode, Z-mode and LO-mode waves by a numerical simulation solving Maxwell's equations and the equation of motion of a cold electron fluid. The wave coupling process occurring in the cold magnetized plasma are examined in detail. In order to give a realistic initial plasma condition in the numerical experiments, we use initial parameters inferred f

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29

Sun, Limin, Hua Huang, Shifeng Li, et al. "Investigation on High-Efficiency Beam-Wave Interaction for Coaxial Multi-Beam Relativistic Klystron Amplifier." Electronics 11, no. 2 (2022): 281. http://dx.doi.org/10.3390/electronics11020281.

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To significantly improve the electronic efficiency of coaxial multi-beam relativistic klystron amplifier (CMB-RKA), the physical process of beam-wave interaction and parameters that affect efficiency was studied. First, the high efficiency of beam-wave interaction was discussed by simulating the efficiency versus the parameters (frequency of cavity, drift tube length between cavities, and external quality factor of output cavity), in the one-dimensional (1-D) large-signal simulation software. Moreover, the further physical process of beam-wave interaction was analyzed through simulating the cu

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30

Qi, Yusheng, Wenting Xiao, and Dick K. P. Yue. "Phase-Resolved Wave Field Simulation Calibration of Sea Surface Reconstruction Using Noncoherent Marine Radar." Journal of Atmospheric and Oceanic Technology 33, no. 6 (2016): 1135–49. http://dx.doi.org/10.1175/jtech-d-15-0130.1.

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AbstractThe possibility of reconstructing sea surface wave fields from a noncoherent X-band marine radar return has much potential for maritime operations and ocean engineering. The existing reconstruction method extracts the signal associated with gravity waves that satisfy the dispersion relationship. The process involves parameters related to how the radar signal is modulated by waves of different lengths, propagation directions, amplitudes, and phases. In the absence of independent wave measurements, these reconstruction parameters cannot be rationally adjusted according to wave field cond

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31

Tian, Lucia, Robert E. Johnson, Orenthal J. Tucker, Adam K. Woodson, Hayley N. Williamson, and Shane R. Carberry Mogan. "Molecular Kinetic Simulations of Transient and Steady Wave Propagation into a Planet’s Exosphere." Atmosphere 14, no. 3 (2023): 441. http://dx.doi.org/10.3390/atmos14030441.

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The vertical propagation of wave energy into a planet’s exosphere, a process that affects atmospheric evolution, is calculated here using 1D molecular kinetic simulations. Effects sensitive to molecular interactions are examined by comparing simulation results to solutions of linear fluid models for steady wave activity using parameters associated with Mars’ upper atmosphere. In addition to correctly describing the wave behavior in the exobase region, these simulations directly yield nonlinear effects such as atmospheric heating. They also readily include the transient behavior due to the onse

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32

Yang, Zixuan, Bing-Qing Deng, and Lian Shen. "Direct numerical simulation of wind turbulence over breaking waves." Journal of Fluid Mechanics 850 (July 4, 2018): 120–55. http://dx.doi.org/10.1017/jfm.2018.466.

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We study wind turbulence over breaking waves based on direct numerical simulation (DNS) of two-fluid flows. In the DNS, the air and water are simulated as a coherent system, with the interface captured using the coupled level-set and volume-of-fluid method. Because the wave breaking is an unsteady process, we use ensemble averaging over 100 runs to define turbulence statistics. We focus on analysing the turbulence statistics of the airflow over breaking waves. The effects of wave age and wave steepness are investigated. It is found that before wave breaking, the turbulence statistics are large

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Yu, Wen, Fenggang Wang, Jianguo Lin, and Dong Li. "Numerical Simulation of the Force Acting on the Riser by Two Internal Solitary Waves." Applied Sciences 12, no. 10 (2022): 4873. http://dx.doi.org/10.3390/app12104873.

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An internal wave is a typical dynamic process. As an internal wave, an internal solitary wave usually occurs between two layers of fluids with different densities. Compared with general internal waves, internal solitary waves have large amplitudes, fast propagation speeds, short-wave periods, and often have tremendous energy. The propagation causes strong convergence and divergence of seawater and generates a sudden strong current. Due to its various characteristics, the propagation of internal solitary waves can cause serious harm to offshore engineering structures. Therefore, studying the ef

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34

Stegehuis, A. I., R. Vautard, P. Ciais, A. J. Teuling, D. G. Miralles, and M. Wild. "An observation-constrained multi-physics WRF ensemble for simulating European mega heat waves." Geoscientific Model Development 8, no. 7 (2015): 2285–98. http://dx.doi.org/10.5194/gmd-8-2285-2015.

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Abstract. Many climate models have difficulties in properly reproducing climate extremes, such as heat wave conditions. Here we use the Weather Research and Forecasting (WRF) regional climate model with a large combination of different atmospheric physics schemes, in combination with the NOAH land-surface scheme, with the goal of detecting the most sensitive physics and identifying those that appear most suitable for simulating the heat wave events of 2003 in western Europe and 2010 in Russia. In total, 55 out of 216 simulations combining different atmospheric physical schemes have a temperatu

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35

Wu, Gengkun, Bin Liu, and Lichen Han. "Normalized Radar Scattering Section Simulation and Numerical Calculation of Freak Wave." Journal of Marine Science and Engineering 10, no. 11 (2022): 1631. http://dx.doi.org/10.3390/jmse10111631.

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The improved phase modulation method is used to numerically simulate a two-dimensional freak wave. While generating freak waves at specific positions, the spectral structure of the target spectrum can also be maintained, and the statistical characteristics of wave sequences can be satisfied. The numerical simulation process is discussed in detail from the perspective of different wave spectra and other parameters, the priority applicability of the Joint North Sea Wave Project (JONSAWP) spectrum is determined, and the accuracy of the numerical simulation is significantly improved. At the same t

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36

Ye, Mengsi, Huifang Li, Yougang Wang, and Caifu Qian. "Hydroforming of Toroidal Bellows: Process Simulation and Quality Control." Materials 14, no. 1 (2020): 142. http://dx.doi.org/10.3390/ma14010142.

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Having higher capacity to undertake pressures and larger compensation ability compared with the U-shape bellows, toroidal or Ω-shape bellows are being more and more widely used in engineering. The wave-shape and wall thickness reduction of bellows are the most important parameters for measuring the hydroforming quality of the bellows. In order to provide references for actual manufacturing, it is valuable to study the factors influencing the hydroforming process and quality of the bellows. In this paper, finite element simulations of the hydroforming process of a monolayer and single-wave toro

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37

CARPENTER, J. R., E. W. TEDFORD, M. RAHMANI, and G. A. LAWRENCE. "Holmboe wave fields in simulation and experiment." Journal of Fluid Mechanics 648 (April 7, 2010): 205–23. http://dx.doi.org/10.1017/s002211200999317x.

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The basic wave field resulting from Holmboe's instability is studied both numerically and experimentally. Comparisons between the direct numerical simulations (DNS) and laboratory experiments result in Holmboe waves that are similar in their appearance and phase speed. However, different boundary conditions result in mean flows that display gradual variations either temporally (in the simulations) or spatially (in the experiments). These differences are found to affect the evolution of the dominant wavenumber and amplitude of the wave field. The simulations exhibit a nonlinear ‘wave coarsening

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Zhang, Wei, Yanjun Liu, Huaqing Luo, Gang Xue, and Jian Zhang. "Experimental and Simulative Study on Accumulator Function in The Process of Wave Energy Conversion." Polish Maritime Research 23, no. 3 (2016): 79–85. http://dx.doi.org/10.1515/pomr-2016-0035.

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Abstract In this paper, a floating-buoy wave energy converter using hydrostatic transmission system is studied. The entire work progress of wave energy power generation device is introduced, and the hydraulic transmission principles are emphasized through the simulation to verify the feasibility of design principle of hydraulic transmission system. The mathematical model of the accumulator is established and applied in the AMEsim simulation. The simulation results show that the accumulator plays an important role in the wave power hydraulic transmission system and that the correct configuratio

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39

Zhang, Wei, and Yanjun Liu. "Simulation and Experimental Study in the Process of Wave Energy Conversion." Polish Maritime Research 23, s1 (2016): 123–30. http://dx.doi.org/10.1515/pomr-2016-0056.

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AbstractThis article introduces the operating principle of the wave energy device and makes AMEsim simulated analysis in the influence of the amplitude and period of the wave on the output efficient. By using the result of the simulation to optimize design, the article puts forwards a kind of suitable control technology which based on the disclosed amplitude and period of the wave to control the check valve, invoking the motor in different levels of efficiency. This kind of technology aims to solve the problem which includes low efficiency and high start wave of the wave energy device. The res

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40

Zhao, Lin, Jagadish Torlapati, Thomas King, Brian Robinson, Michel C. Boufadel, and Kenneth Lee. "A numerical model to simulate the droplet formation process resulting from the release of diluted bitumen products in marine environment." International Oil Spill Conference Proceedings 2014, no. 1 (2014): 449–62. http://dx.doi.org/10.7901/2169-3358-2014.1.449.

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ABSTRACT A numerical model that simulates the dispersion of oil due to the action of waves in the marine environment is presented. Model validations were performed in association with the wave tank experiments conducted in the Department of Fisheries and Oceans (DFO) Canada. Two dilbit products were considered: Access Western Blend and Cold Lake Blend. The oil droplet size distribution in the subsurface water column obtained from the experimental observations was reproduced using the droplet formation model. Special consideration was made for the simulation of wave effects on surface oil spill

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Sun, Wei, Xiao Jie Li, and Kazuyuki Hokamoto. "Numerical Simulation of Underwater Explosive Welding Process." Materials Science Forum 767 (July 2013): 120–25. http://dx.doi.org/10.4028/www.scientific.net/msf.767.120.

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Recently, underwater explosive welding shows its advantage in some difficult-to-weld combinations such as material with thin thickness, high hardness, and fragile quality. The pattern of the typical wave morphology in the interface of the welding specimen indicates the suitability of the selected experimental parameters and sound strength of the laminates. For the existence of the water, traditional Gurney formula and Aziz formula can not directly be used to evaluate the velocity and acceleration process of the flyer plate. Numerical simulation is necessary and irreplaceable for existing knowl

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Hirayama, Katsuya, Hiroaki Kashima, and Yoshiyuki Uno. "ESTIMATION OF BOUND AND RELEASED INFRAGRAVITY WAVES BASED ON WAVE OBSERVATION AND NUMERICAL SIMULATION IN SHALLOW WATER." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 37. http://dx.doi.org/10.9753/icce.v36.currents.37.

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It is mentioned that observed infragravity waves consist of bound waves propagating with short-wave groups, released waves due to reduction of short crest waves and free waves existing in a field. Though it is difficult to distinguish among them, a standard spectrum for infragravity waves is defined by using a relation to a wind wave spectrum. In this study, a comprehensive definition of standard spectrum is newly proposed to estimate infragravity wave heights with the relation between the ratio of wave height and the ursell number of observed wave property, represented by selected data of wav

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43

He, Yameng, Lei Song, Keke Xue, et al. "Ultrasonic Coda Wave Experiment and Simulation of Concrete Damage Process under Uniaxial Compression." Buildings 12, no. 5 (2022): 514. http://dx.doi.org/10.3390/buildings12050514.

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Using the coda wave interferometry (CWI) method to obtain the ultrasonic coda wave characteristics of loaded concrete is an important method to evaluate the mechanical response of concrete. In this paper, the ultrasonic coda wave characteristics of C40–C70 concrete specimens (four strengths of concrete) under uniaxial compression were tested by laboratory experiments. Furthermore, to clarify the relationship between the internal damage process of concrete and the change rate of coda wave velocity, an ultrasonic coda wave discrete element simulation model combined with digital image processing

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44

Li, Feiyu, Xiangrong Fu, and Seth Dorfman. "Hybrid simulation of Alfvén wave parametric decay instability in a laboratory relevant plasma." Physics of Plasmas 29, no. 9 (2022): 092108. http://dx.doi.org/10.1063/5.0100144.

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Large-amplitude Alfvén waves are subject to parametric decays, which can have important consequences in space, astrophysical, and fusion plasmas. Although the Alfvén wave parametric decay instability (PDI) was predicted decades ago, observational evidence is limited, stimulating considerable interest in laboratory demonstration of the instability and associated numerical modeling. Here, we report an important step toward direct hybrid simulation of the Alfvén wave PDI in a laboratory plasma, using antenna-like wave injection of a circularly polarized wave and realistic wave-plasma parameters.

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45

Gurnari, Luana, Pasquale G. F. Filianoti, Marco Torresi, and Sergio M. Camporeale. "The Wave-to-Wire Energy Conversion Process for a Fixed U-OWC Device." Energies 13, no. 1 (2020): 283. http://dx.doi.org/10.3390/en13010283.

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Oscillating water column (OWC) devices, either fixed or floating, are the most common wave energy converter (WEC) devices. In this work, the fluid dynamic interaction between waves and a U-shaped OWC breakwater embedding a Wells turbine has been investigated through unsteady Computational Fluid Dynamic (CFD) simulations. The full-scale plant installed in the harbor of Civitavecchia (Italy) was numerically modeled. A two-dimensional domain was adopted to simulate the unsteady flow, both outside and inside the U-OWC device, including the air chamber and the oscillating flow inside the conduit ho

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46

Cornett, A., and M. D. Miles. "Simulation of Hurricane Seas in a Multidirectional Wave Basin." Journal of Offshore Mechanics and Arctic Engineering 113, no. 3 (1991): 219–27. http://dx.doi.org/10.1115/1.2919923.

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This paper describes the generation and verification of four realistic sea states in a multidirectional wave basin, each representing a different storm wave condition in the Gulf of Mexico. In all cases, the degree of wave spreading and the mean direction of wave propagation are strongly dependent on frequency. Two of these sea states represent generic design wave conditions typical of hurricanes and winter storms and are defined by JONSWAP wave spectra and parametric spreading functions. Two additional sea states, representing the specific wave activity during hurricanes Betsy and Carmen, are

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Alberello, Alberto, and Alessandro Iafrati. "The Velocity Field Underneath a Breaking Rogue Wave: Laboratory Experiments Versus Numerical Simulations." Fluids 4, no. 2 (2019): 68. http://dx.doi.org/10.3390/fluids4020068.

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Wave breaking is the most characteristic feature of the ocean surface. Physical investigations (in the field and at laboratory scale) and numerical simulations have studied the driving mechanisms that lead to wave breaking and its effects on hydrodynamic loads on marine structures. Despite computational advances, accurate numerical simulations of the complex breaking process remain challenging. Validation of numerical codes is routinely performed against experimental observations of the surface elevation. However, it is still uncertain whether simulations can accurately reproduce the velocity

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48

Usui, H., H. Matsumoto, and R. Gendrin. "Numerical simulations of a three-wave coupling occurring in the ionospheric plasma." Nonlinear Processes in Geophysics 9, no. 1 (2002): 1–10. http://dx.doi.org/10.5194/npg-9-1-2002.

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Abstract. We studied a three-wave coupling process occurring in an active experiment of microwave power transmission (MPT) in the ionospheric plasma by performing one-dimensional electromagnetic PIC (Particle-In-Cell) simulations. In order to examine the spatial variation of the coupling process, we continuously emitted intense electromagnetic waves from an antenna located at a simulation boundary. In the three-wave coupling, a low-frequency electrostatic wave is excited as the result of a nonlinear interaction between the forward propagating pump wave and backscattered wave. In the simulation

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49

Zhang, Weixin, Ye Li, Yulei Liao, Qi Jia, and Kaiwen Pan. "Hydrodynamic Analysis of Self-Propulsion Performance of Wave-Driven Catamaran." Journal of Marine Science and Engineering 9, no. 11 (2021): 1221. http://dx.doi.org/10.3390/jmse9111221.

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The wave-driven catamaran is a small surface vehicle driven by ocean waves. It consists of a hull and hydrofoils, and has a multi-body dynamic structure. The process of moving from static state to autonomous navigation driven by ocean waves is called “self-propulsion”, and reflects the ability of the wave-driven catamaran to absorb oceanic wave energy. Considering the importance of the design of the wave-driven catamaran, its self-propulsion performance should be comprehensively analysed. However, the wave-driven catamaran’s multi-body dynamic structure, unpredictable dynamic and kinematic res

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Yang, Guo Liang, Ren Shu Yang, Chuan Huo, and Yu Long Che. "Numerical Simulation of Stress Wave Propagation Induced by Cut Blasting in Multi-Media." Applied Mechanics and Materials 249-250 (December 2012): 22–25. http://dx.doi.org/10.4028/www.scientific.net/amm.249-250.22.

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Explosive blasting in rock and other media could induce strong shock wave. Near blasting zone, the blasting energy mainly break rock. Slightly far away from borehole, the blasting energy induces plastic damage. Farther afield, this kind of energy presents elastic deformation. In cut blasting, multi-boreholes initiate at the same time, multi-column stress waves occur superimpose and converge. Especially in multi-media, this process is extremely complex. Adopt numerical simulation method, set up multi-media model, which include weathered rock, highly weathered rock and plain fill. This paper sim

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