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Articles de revues sur le sujet « Pressure-Wave-Propagation method »

Auteur : Grafiati
Publié le 21 décembre 2024
Mis à jour le 28 juillet 2025

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1

HoIe, S. "Recent developments in the pressure wave propagation method." IEEE Electrical Insulation Magazine 25, no. 3 (2009): 7–20. http://dx.doi.org/10.1109/mei.2009.4976898.

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Miyazaki, Yusuke, Jon Farmer, Miki Morimatsu, Shota Ito, Séan Mitchell, and Paul Sherratt. "Brain Pressure Wave Propagation during Baseball Impact." Proceedings 49, no. 1 (2020): 149. http://dx.doi.org/10.3390/proceedings2020049149.

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Tommasin, Caenen, Verhegghe, Greenwald, and Segers. "Physics of Within-Tissue Wave Propagation Generated by Pulse Propagation in the Carotid Artery." Applied Sciences 9, no. 14 (2019): 2878. http://dx.doi.org/10.3390/app9142878.

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(1) Background: We aimed to assess the validity of laser Doppler vibrometry (LDV) as an emerging method to measure the local pulse wave velocity (PWV) from skin displacement generated by the pressure pulse inside an underlying artery. (2) Methods: A finite element model representing a simplified common carotid artery embedded within a soft tissue mimicking material was used to reproduce how tissue motions due to a wave propagation along the artery radiates to the skin surface. A parametric study was set up, varying: (i) the pressure conditions inside the artery (shock and traveling pressure im
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Zhang, Xiu Hua, and Yan Yan Wu. "Numerical Analysis of Shock Wave Propagation Law of Internal Gas Explosion." Applied Mechanics and Materials 105-107 (September 2011): 299–302. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.299.

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The purpose of this paper is to research on shock wave propagation law of internal gas explosion. The multi-material Eulerian and Lagrangian coupling algorithm was adopt. Using ANSYS/LS-DYNA dynamic analysis software to build frame structure, air and gas explosion models. Multiple ALE elements for simulating air and gas explosion material the analysis of blast shock wave propagation in a three-story steel frame structure and the characteristics of explosion pressure using fluid-structure coupling method are carried out. The conclusions show that fluid-structure coupling method can well simulat
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William-Louis, M. J. P., and C. Tournier. "Calculation of Pressure Wave Propagation Through a Tube Junction." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 210, no. 3 (1996): 239–44. http://dx.doi.org/10.1243/pime_proc_1996_210_193_02.

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This paper describes a new method for the calculation of pressure wave propagation through a junction. The unsteady model, valid for subsonic flow, takes into account the fluid compressibility and pressure losses according to the type of junction. A new method called the ‘branch superposition method’ is used for the numerical calculation, and consists of uncoupling the system of governing equations. During the propagation of pressure waves through a three-tube junction, two branches are inlet or outlet. Therefore, to uncouple the system, one of the two branches with incoming flow is modelled a
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Wei, Kang, Yuangui Mei, Qi Sun, and Xiao Hu. "Propagation Characteristics of Initial Compression Wave Induced by 400 km/h High-Speed Trains Passing through Very Long Tunnels." Applied Sciences 14, no. 13 (2024): 5946. http://dx.doi.org/10.3390/app14135946.

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When high-speed trains enter tunnels, an initial compression wave is generated. As the compression wave propagates at the local speed of sound to the tunnel exit, it radiates into the surrounding environment, forming micro-pressure waves (MPWs). MPWs create sonic booms, resulting in significant environmental issues. The magnitude of the micro-pressure waves is directly proportional to the pressure gradient of the compression wave at the tunnel exit. The nonlinear effects of the initial compression wave during propagation lead to a significant increase in pressure gradient. Therefore, the propa
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Yang, Jun, Junhua He, Dezhi Zhang, et al. "Local Phase-Amplitude Joint Correction for Free Surface Velocity of Hopkinson Pressure Bar." Applied Sciences 10, no. 15 (2020): 5390. http://dx.doi.org/10.3390/app10155390.

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The Hopkinson pressure bar is widely used to measure the reflected pressure of blast waves over a short distance. However, dispersion effects will occur when the elastic stress waves propagate in the pressure bar due to lateral inertia, and there will be errors between the signals obtained from the sensors and the actual loading. For the free surface velocity measured in our system, we developed a local phase-amplitude joint correction method to convert the measured velocity into the average reflected pressure of a shock wave at the impact end of the bar, considering factors such as propagatio
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Sun, Yali, Feihu Zheng, Zhenlian An, et al. "Pressure wave propagation method for space charge measurement in coaxial geometry." IEEE Transactions on Dielectrics and Electrical Insulation 25, no. 6 (2018): 2139–46. http://dx.doi.org/10.1109/tdei.2018.007234.

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Akkas, N., and F. Erdogan. "The Residual Variable Method Applied to Acoustic Wave Propagation from a Spherical Surface." Journal of Vibration and Acoustics 115, no. 1 (1993): 75–80. http://dx.doi.org/10.1115/1.2930318.

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The classical wave equation in spherical coordinates is expressed in terms of a residual potential applying the Residual Variable Method. This method essentially eliminates the second derivative of the potential with respect to the radial coordinate from the wave equation. Thus, the dynamic pressure distribution on the surface of a spherical cavity can be studied by considering the cavity surface only. Moreover, the Residual Variable Method, being amenable to “marching” solutions in a finite-difference implementation, is very suitable for the analysis of acoustic wave propagation into the fini
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Shatalova, N., T. Apasov, Al Shatalov, and B. Grigoriev. "Renovation method of restoring well productivity using wavefields." Journal of Mining Institute 258 (December 30, 2022): 986–97. http://dx.doi.org/10.31897/pmi.2022.108.

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A stagewise theoretical substantiation of the renovation vibrowave method of influencing the near-wellbore zone of reservoir for restoring well productivity is presented. The area of treatment by the proposed method covers the reservoir with a heterogeneous permeability with fractures formed by fracking. In this method a decrease in concentration of colmatants occurs due to a change in direction of contaminants migration. Under the influence of pressure pulses, they move deep into the reservoir and disperse through the proppant pack. The results of mathematical modelling of the propagation of
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CHANDRA, R., and S. SINGH. "Propagation of Laser Generated Shock Waves through Heterogeneous Metallic Mediums." Journal of Ultra Scientist of Physical Sciences Section B 36, no. 3 (2024): 19–27. http://dx.doi.org/10.22147/jusps-b/360301.

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This paper deals with an analytical study of shock waves propagating in heterogeneous metallic mediums. A shock wave travels through most media at a speed higher than ordinary wave. The propagation of a shock wave created by a laser impact over a metallic surface is considered here. In the process of Shock wave generation, a high-pressure surface level is reached using a nanosecond laser pulse that heats the surface of the material and generates adense plasma expansion. The pressure reaches few GPa so that shockwaves are generated and propagated in the bulk of the material. Whitham method, a p
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Zhang, Gang. "Experimental Study on Shock Wave Propagation of the Explosion in a Pipe with Holes by High-Speed Schlieren Method." Shock and Vibration 2020 (September 12, 2020): 1–9. http://dx.doi.org/10.1155/2020/8850443.

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The shock wave propagation of the explosion in a pipe with holes was studied by a high-speed schlieren experimental system. In the experiments, schlieren images in the explosion were recorded by a high-speed camera from parallel and perpendicular orientations, respectively, and the pressure in the air was measured by an overpressure test system. In parallel orientation, it is observed that the steel pipe blocks the propagation of blast gases, but it allows the propagation of shock waves with a symmetrical shape. In perpendicular orientation, oblique shock wave fronts were observed, indicating
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Li, Zhan Hui, Yun Xin Wu, and Zhi Li Long. "Effect of Contact Interface Pressure on Higher-Order Harmonic Wave and Bond Strength." Advanced Materials Research 148-149 (October 2010): 36–39. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.36.

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The model of ultrasonic propagation at a solid-solid contact interface was established. Higher-order harmonic wave generation and waveform distortion take place when the ultrasonic wave propagation at the solid-solid contact interface. Aluminum wire bond experiments were performed on a laboratory test bench. The relation of bond strength, nonlinear coefficient and contact interface pressure was studied. The experiment results show that when contact interface pressure is less than 6 kPa, higher-order harmonic wave component and the nonlinear coefficient decrease and bond strength increases with
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14

Leontyeva, I. V., I. A. Kovalev, M. A. Shkolnikova, et al. "Early diagnosis of increased stiffness of great vessels in adolescents with functional pathology of vegetative genesis." Rossiyskiy Vestnik Perinatologii i Pediatrii (Russian Bulletin of Perinatology and Pediatrics) 66, no. 3 (2021): 52–61. http://dx.doi.org/10.21508/1027-4065-2021-66-3-52-61.

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40 adolescents aged 15–17 years with functional cardiovascular pathology of vegetative origin underwent a 24-hour blood pressure monitoring (using the oscillometric method BPLabVasotens, Peter Telegin LLC, Nizhny Novgorod) with an assessment of central blood pressure parameters and rigidity of the main arteries.The scientists found significantly higher values of central systolic pressure during the day and night hours in the group of adolescents with arterial hypertension (n=13) compared to adolescents with normal blood pressure (n=27). They determined significantly higher values of the pulse
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15

Hou, Qingmin, Liang Ren, Wenling Jiao, Pinghua Zou, and Gangbing Song. "An Improved Negative Pressure Wave Method for Natural Gas Pipeline Leak Location Using FBG Based Strain Sensor and Wavelet Transform." Mathematical Problems in Engineering 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/278794.

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Methods that more quickly locate leakages in natural gas pipelines are urgently required. In this paper, an improved negative pressure wave method based on FBG based strain sensors and wavelet analysis is proposed. This method takes into account the variation in the negative pressure wave propagation velocity and the gas velocity variation, uses the traditional leak location formula, and employs Compound Simpson and Dichotomy Searching for solving this formula. In addition, a FBG based strain sensor instead of a traditional pressure sensor was developed for detecting the negative pressure wave
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16

Tanaka, A., M. Maeda, and T. Takada. "Observation of charge behavior in organic photoconductor using pressure-wave propagation method." IEEE Transactions on Electrical Insulation 27, no. 3 (1992): 440–44. http://dx.doi.org/10.1109/14.142704.

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Zhang, Yongjian, Peng Peng, Tao Lin, Aiwei Lou, Dahai Li, and Changan Di. "Research on the Shock Wave Overpressure Peak Measurement Method Based on Equilateral Ternary Array." Sensors 24, no. 6 (2024): 1860. http://dx.doi.org/10.3390/s24061860.

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The measurement process of ground shock wave overpressure is influenced by complex field conditions, leading to notable errors in peak measurements. This study introduces a novel pressure measurement model that utilizes the Rankine−Hugoniot relation and an equilateral ternary array. The research delves into examining the influence of three key parameters (array size, shock wave incidence angle, and velocity) on the precision of pressure measurement through detailed simulations. The accuracy is compared with that of a dual-sensor array under the same conditions. Static explosion tests were cond
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18

Butt, Hafiz Sana Ullah, and Pu Xue. "Wave Dispersion and Attenuation in Viscoelastic Split Hopkinson Pressure Bar." Key Engineering Materials 535-536 (January 2013): 547–50. http://dx.doi.org/10.4028/www.scientific.net/kem.535-536.547.

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The Split Hopkinson Pressure Bar (SHPB) is most commonly used facility to obtain material properties at high strain rates. Testing of soft materials using this method requires that bars made of low impedance material should be used, in order to improve signal-to-noise ratio of transmitted stress. However, utilization of such bars poses some difficulties in data processing as the wave dispersion and attenuation becomes noticeable due to their viscoelastic nature. Wave propagation coefficients of a viscoelastic pressure bar are evaluated using incident and reflected strain waves generated throug
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19

Qiu, Xiao, Jue Ding, Zhong Jie Wang, and Pei Feng Weng. "The Similarity Law of Internal-Blast Wave Propagation in the Concrete." Advanced Materials Research 1065-1069 (December 2014): 1143–46. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.1143.

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Concrete mechanical properties under dynamic load such as blast and impact are very complex. Shock wave propagation law and damage effect in the concrete were studied numerically in the paper by using TNT explosive ignition and growth model, concrete dynamic damage model, and SPH method. And shock wave properties of different mass explosives in the concrete were analyzed with the similarity theory. The result shows that TNT shock wave propagation law meets the internal-blast similarity law. Peak pressure, positive pressure impulse, maximum velocity and maximum acceleration in the concrete decr
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CHANDRA, R., and D. S. SINGH. "Models of shock wave propagation for diverging metallic structures." Journal of Ultra Scientist of Physical Sciences Section B 36, no. 6 (2024): 39–49. https://doi.org/10.22147/jusps-b/360601.

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In the present study we have considered shock waves propagating freely in some diverging metallic structures. The characteristic equation along with boundary conditions provides a differential equation that is used to evaluate certain flow variables and parameters. The Chisnell-Chester-Whitham (CCW) method forms the basis to obtain the analytical relations for shock velocity, shock strength and pressure behind the shock wave. The variation of pressure with parameter  (compression behind the shock) and propagation distance r is obtained for cylindrical (barrel) shock waves. It is found that sh
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21

Nurprasetio, Ignatius Pulung, Bentang Arief Budiman, Farid Triawan, and Muhammad Hafid. "Measurement of pressure wave speed in stainless-steel pipe generated by water hammer." MATEC Web of Conferences 197 (2018): 08020. http://dx.doi.org/10.1051/matecconf/201819708020.

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This paper aims to demonstrate a measurement method of pressure wave speed in stainless-steel pipe filled with water caused by water hammer phenomenon. The pressure wave is generated using a self-developed drop impact testing equipment. An impactor is dropped to collide a buffer which then induces the water hammer phenomenon. The generated pressure and its propagation speed in the water are carefully measured here. Pressure measurement is conducted by a pressure transducer, while pressure wave speed is measured by two methods, which utilize peak time of the pressure recorded by pressure transd
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Zienkiewicz, Aleksandra, Michelle Favre, Hany Ferdinando, Stephanie Iring, Jorge Serrador, and Teemu Myllylä. "Blood pressure wave propagation—a multisensor setup for cerebral autoregulation studies." Physiological Measurement 42, no. 11 (2021): 115007. http://dx.doi.org/10.1088/1361-6579/ac3629.

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Abstract Objective. Cerebral autoregulation is critically important to maintain proper brain perfusion and supply the brain with oxygenated blood. Non-invasive measures of blood pressure (BP) are critical in assessing cerebral autoregulation. Wave propagation velocity may be a useful technique to estimate BP but the effect of the location of the sensors on the readings has not been thoroughly examined. In this paper, we were interested in studying whether the propagation velocity of a pressure wave in the direction from the heart to the brain may differ compared with propagation from the heart
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23

Zhang, Haotian, Linjian Ma, Zongmu Luo, and Ning Zhang. "Wave Attenuation and Dispersion in a 6 mm Diameter Viscoelastic Split Hopkinson Pressure Bar and Its Correction Method." Shock and Vibration 2020 (November 16, 2020): 1–10. http://dx.doi.org/10.1155/2020/8888445.

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The propagation characteristics of viscoelastic waves have been investigated with a 6 mm diameter split Hopkinson pressure bar (SHPB) made of polymethyl methacrylate (PMMA). The strain signals in SHPB tests were improved by the pulse shaping technique. Based on the experimentally determined propagation coefficients, the amplitude attenuation and wave dispersion induced by viscoelastic effects at different impact velocities were quantitatively analyzed. The results indicate that the high-frequency harmonics attenuate faster in a higher phase velocity. With an increase in the impact velocity, th
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Resch, Janelle, Lilia Krivodonova, and John Vanderkooy. "A Two-Dimensional Study of Finite Amplitude Sound Waves in a Trumpet Using the Discontinuous Galerkin Method." Journal of Computational Acoustics 22, no. 03 (2014): 1450007. http://dx.doi.org/10.1142/s0218396x14500076.

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A model for nonlinear sound wave propagation for the trumpet is proposed. Experiments have been carried out to measure the sound pressure waveforms of the [Formula: see text] and [Formula: see text] notes played forte. We use these pressure measurements at the mouthpiece as an input for the proposed model. The compressible Euler equations are used to incorporate nonlinear wave propagation and compressibility effects. The equations of motion are solved using the discontinuous Galerkin method (DGM) and the suitability of this method is assessed. The third spatial dimension is neglected and the c
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Cheng, Z. Q., J. R. Crandall, and W. D. Pilkey. "Wave Dispersion and Attenuation in Viscoelastic Split Hopkinson Pressure Bar." Shock and Vibration 5, no. 5-6 (1998): 307–15. http://dx.doi.org/10.1155/1998/906291.

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A viscoelastic split Hopkinson pressure bar intended for testing soft materials with low acoustic impedance is studied. Using one-dimensional linear viscoelastic wave propagation theory, the basic equations have been established for the determination of the stress—strain—strain rate relationship for the tested material. A method, based on the spectral analysis of wave motion and using measured wave signals along the split Hopkinson pressure bar, is developed for the correction of the dispersion and attenuation of viscoelastic waves. Computational simulations are performed to show the feasibili
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Xu, Min, Melad Olaimat, Tao Tang, et al. "Numerical Modeling of the Radio Wave Over-the-Horizon Propagation in the Troposphere." Atmosphere 13, no. 8 (2022): 1184. http://dx.doi.org/10.3390/atmos13081184.

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Using atmospheric data, which include pressure, temperature, relative humidity and water vapor pressure, the actual refractive index of a specific segment of the atmosphere has been modeled. Based on the refractive index, a numerical method is presented to quickly estimate the propagation path of the radio wave in the troposphere. Utilizing the terrain and the surface medium model of the propagation area and the parabolic equation (PE) method, an image of the electric field distribution of radio waves in the troposphere is obtained. A comparison of propagation paths between the numerical metho
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Qiu, Hua, Zheng Su, and Cha Xiong. "Experimental investigation on multi-cycle two-phase spiral pulse detonation tube of two configurations." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 11 (2018): 4166–75. http://dx.doi.org/10.1177/0954410018817455.

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The spiral tube structure is an effective method to shorten the axial length of the pulse detonation chamber. In this article, spiral pulsed detonation tube with two kinds of spiral configuration was experimentally investigated. Liquid gasoline and air were used as fuel and oxidant, respectively, and equivalence ratios were controlled to about 1.0. Based on the transient pressure along the tube, the propagation characteristics of the pressure waves in the multi-cycle spiral pulsed detonation tubes, such as pressure peaks, wave velocities and propagation process, were analyzed. Results showed t
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Zhou, Changlong, Yingjun Li, Guicong Wang, and Xue Yang. "Array model of shock pressure sensor for shooting point detection." MATEC Web of Conferences 355 (2022): 01027. http://dx.doi.org/10.1051/matecconf/202235501027.

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The array model of double-T shock pressure sensor is established. Shock wave is produced by a supersonic object in the air. Pressure is produced in the process of shock wave transmission. Different shock pressure sensors have different time to receive the pressure signal. In this paper, the shooting point calculation model and the finite element model of the double T-shaped array method are established. The simulation experiment is carried out. The law of shock wave propagation is verified. The model can be used to calculate the coordinates of shooting point quickly. This method is suitable fo
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Pan, Jiajia, and Hung Tao Shen. "Tsunami Intrusion and River Ice Movement." Water 11, no. 6 (2019): 1290. http://dx.doi.org/10.3390/w11061290.

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A two-dimensional wave model coupled with ice dynamics is developed to evaluate ice effects on shallow water wave propagation on a beach and in a channel. The nonlinear Boussinesq equations with ice effects are derived and solved by the hybrid technique of the Godunov-type finite volume method and finite difference method with the third-order Runge–Kutta method for time integration. The shock capturing method enables the model to simulate complex flows over irregular topography. The model is capable of simulating wave propagations accurately, including non-hydrostatic water pressure and wave d
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Liu, Xinying, and David F. Fletcher. "Verification of fluid-structure interaction modelling for wave propagation in fluid-filled elastic tubes." Journal of Algorithms & Computational Technology 17 (January 2023): 174830262311597. http://dx.doi.org/10.1177/17483026231159793.

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This paper presents a verification study of wave propagation in fluid-filled elastic tubes using a coupled numerical simulation method by comparing the simulation results with analytical solutions. A three-dimensional fluid-structure interaction numerical model is built using Ansys software. Wave propagation is investigated by applying a pressure pulse at the inlet of a fluid-filled elastic tube. The speed of the pressure wave and the radial displacement of the tube are simulated and compared with theoretical values. Simulation results yield a high level of accuracy. Different structural eleme
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Chen, Jiangping, Weijun Tao, Shi Huan, and Chong Xu. "Data processing of wave propagation in viscoelastic split Hopkinson pressure bar." AIP Advances 12, no. 4 (2022): 045210. http://dx.doi.org/10.1063/5.0083888.

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In this study, the polymethyl methacrylate (PMMA) bar was taken as an example to study the data processing of the viscoelastic Split Hopkinson pressure bar (SHPB) during shock wave propagation. First, SHPB tests of the PMMA bar were conducted, and the strain data measured at the position of the strain gauges on the viscoelastic PMMA bar were processed by using the improved Lagrange analysis method (LAM) to obtain the full-field strain, particle velocity, and stress data. Then, the Zhu–Wang–Tang dynamic viscoelastic constitutive model was adopted, and the parameters were calibrated to determine
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Ling, Meiting, Ting Zhao, Wenguo Luo, Jianfeng Zhu, and Yancheng You. "Analysis of Aerodynamic Characteristics of Rotating Detonation Turbine Based on Proper Orthogonal Decomposition Method." Aerospace 12, no. 5 (2025): 406. https://doi.org/10.3390/aerospace12050406.

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The unsteady interactions in rotating detonation turbine engines (RDTE) remain poorly understood. To address this, a 2D numerical model integrating a rotating detonation combustor (RDC) with a first-stage turbine is established to analyze flow structures and aerodynamics under various detonation modes. Proper orthogonal decomposition (POD) reveals intrinsic links between flow features and performance metrics. Results show that while the RDC generates total pressure gain, it induces significant unsteady flow. Guide vanes partially suppress pressure fluctuations but cannot eliminate total pressu
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Zhu, X., W. B. Ye, T. Y. Li, and C. Chen. "The elastic critical pressure prediction of submerged cylindrical shell using wave propagation method." Ocean Engineering 58 (January 2013): 22–26. http://dx.doi.org/10.1016/j.oceaneng.2012.09.008.

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Zhao, Yang, Zhenghan Peng, Shuyuan Kong, Pinghua Yang, and Xiao Wang. "Simulation of ultrasonic characterization for the microstructure of titanium alloy." Journal of Physics: Conference Series 2775, no. 1 (2024): 012003. http://dx.doi.org/10.1088/1742-6596/2775/1/012003.

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Abstract This paper describes a method of simulating the ultrasonic longitudinal wave (P-wave) propagation in titanium alloy. The two-dimensional geometric model of polycrystalline titanium alloy is established using the Voronoi algorithm. Then, the model was imported into COMSOL software for grid division and parameter setting. The continuous observation of P-wave propagation was realized after adding the physical field of sound pressure and the boundary condition. Further, the first and second transmitted P-wave obtained the ultrasonic attenuation spectrum (UAS). The inverse method determine
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Zheng, Zhixia, Limei Bai, and Shaoquan Li. "Blood Pressure Model Based on Hybrid Feature Convolution Neural Network in Promoting Rehabilitation of Patients with Hypertensive Intracerebral Hemorrhage." Computational and Mathematical Methods in Medicine 2021 (December 7, 2021): 1–8. http://dx.doi.org/10.1155/2021/1980408.

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Objective. Accurate prediction of the rise of blood pressure is essential for the hypertensive intracerebral hemorrhage. This study uses the hybrid feature convolution neural network to establish the blood pressure model instead of the traditional method of pulse waves. Methods. The pulse waves of 100 patients were collected, and the pulse wave was decomposed into three bell wave compound forms to obtain the accurate pulse wave propagation time. Then, the mixed feature convolution neural network model ABP-net was proposed, which combined the pulse wave propagation time characteristics with the
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Liang, Shin-Jye, Chih-Chieh Young, Chi Dai, Nan-Jing Wu, and Tai-Wen Hsu. "Simulation of Ocean Circulation of Dongsha Water Using Non-Hydrostatic Shallow-Water Model." Water 12, no. 10 (2020): 2832. http://dx.doi.org/10.3390/w12102832.

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A two-dimensional non-hydrostatic shallow-water model for weakly dispersive waves is developed using the least-squares finite-element method. The model is based on the depth-averaged, nonlinear and non-hydrostatic shallow-water equations. The non-hydrostatic shallow-water equations are solved with the semi-implicit (predictor-corrector) method and least-squares finite-element method. In the predictor step, hydrostatic pressure at the previous step is used as an initial guess and an intermediate velocity field is calculated. In the corrector step, a Poisson equation for the non-hydrostatic pres
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Xie, Biting, Xiuli Zhang, Hao Wang, Yuyong Jiao, and Fei Zheng. "Investigations into the Rock Dynamic Response under Blasting Load by an Improved DDA Approach." Advances in Civil Engineering 2021 (February 8, 2021): 1–10. http://dx.doi.org/10.1155/2021/8827022.

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Evaluation of blasting-induced rock damage and fragmentation is very important for safety control of construction in the jointed rock mass. The discontinuous numerical models are commonly applied due to the advantages in modeling fragmentation and treating discontinuities. In this paper, the rock fracturing algorithm and rate dependent strength law are incorporated into the discontinuous deformation analysis (DDA) to study the wave propagation and rock fragmentation phenomena in dynamic problems. By reproducing Hopkinson pressure bar tests under different loading rates, the improved method is
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38

Calvo, Lucas, Diana De Padova, Michele Mossa, and Paulo Rosman. "Non-Hydrostatic Discontinuous/Continuous Galerkin Model for Wave Propagation, Breaking and Runup." Computation 9, no. 4 (2021): 47. http://dx.doi.org/10.3390/computation9040047.

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This paper presents a new depth-integrated non-hydrostatic finite element model for simulating wave propagation, breaking and runup using a combination of discontinuous and continuous Galerkin methods. The formulation decomposes the depth-integrated non-hydrostatic equations into hydrostatic and non-hydrostatic parts. The hydrostatic part is solved with a discontinuous Galerkin finite element method to allow the simulation of discontinuous flows, wave breaking and runup. The non-hydrostatic part led to a Poisson type equation, where the non-hydrostatic pressure is solved using a continuous Gal
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39

Qaisar, Hayat, Li Yun Fan, En Zhe Song, Xiu Zhen Ma, Bing Qi Tian, and Naeim Farouk. "Study of Effect of Diesel Fuel Properties on Pressure Wave Profile." Applied Mechanics and Materials 681 (October 2014): 19–22. http://dx.doi.org/10.4028/www.scientific.net/amm.681.19.

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High pressure (HP) fuel pipeline is one of the vital components of Combination Electronic Unit Pump (CEUP) fuel injection system besides pump and injector. Effect of four key fuel properties including density, viscosity, acoustic wave speed and bulk modulus on pressure wave profile has been investigated using a 1D viscous damped mathematical model. Wave equation (WE) based mathematical model has been developed in MATLAB using finite difference method. Dynamic variations of these fuel properties during fuel injection cycles have also been incorporated in mathematical model by utilizing empirica
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40

Lin, Shu-Chao, Qing-Zhao Hou, Anna Derlatka, Shan Gao, Jin-Jun Kang, and Xiao-Lei Dong. "The Study on the Shock Wave Propagation Rule of a Gas Explosion in a Gas Compartment." Shock and Vibration 2022 (January 6, 2022): 1–17. http://dx.doi.org/10.1155/2022/5938950.

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Combined with the k-ε turbulence model of general application, a refined finite element model of a utility tunnel’s gas compartment filled with the methane/air mixture is developed. A series of analyses are made by using the powerful industry-leading computational fluid dynamics (CFD) software flame acceleration simulator (FLACS) to study the shock wave propagation rule in the gas compartment. The longitudinal and transversal distribution laws of the explosion shock wave are gained taking into consideration the spatial characteristics of the gas compartment. The influences of a few parameters,
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41

Antsiperov, V. E., A. S. Bugaev, M. V. Danilychev, and G. K. Mansurov. "Method for estimation of the pulse wave propagation velocity by a manual pneumatic arterial pressure sensor." CARDIOMETRY, no. 18 (May 18, 2021): 38–43. http://dx.doi.org/10.18137/cardiometry.2020.18.3843.

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The paper discusses a new method for diagnosing atherosclerosis using a pneumatic arterial blood pressure sensor previously developed by the authors hereof. The possibility of applying a pneumatic sensor to measure the pulse wave transit time referring to a synchronous ECG is treated herein. The specification of the method consisting in the selection of the characteristic moment of the pulse wave as the timestamp, when measuring the signal transit time in relation to the R-peak of the synchronous ECG, is justified hereby. The averaged values of the wave transit time at different points of the
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42

Le, Thi Thanh Giang, Kyeong Sik Jang, Kwan-Sup Lee, and Jaiyoung Ryu. "Numerical Investigation of Aerodynamic Drag and Pressure Waves in Hyperloop Systems." Mathematics 8, no. 11 (2020): 1973. http://dx.doi.org/10.3390/math8111973.

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Hyperloop is a new, alternative, very high-speed mode of transport wherein Hyperloop pods (or capsules) transport cargo and passengers at very high speeds in a near-vacuum tube. Such high-speed operations, however, cause a large aerodynamic drag. This study investigates the effects of pod speed, blockage ratio (BR), tube pressure, and pod length on the drag and drag coefficient of a Hyperloop. To study the compressibility of air when the pod is operating in a tube, the effect of pressure waves in terms of propagation speed and magnitude are investigated based on normal shockwave theories. To r
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43

GROBY, JEAN-PHILIPPE, and CHRYSOULA TSOGKA. "A TIME DOMAIN METHOD FOR MODELING VISCOACOUSTIC WAVE PROPAGATION." Journal of Computational Acoustics 14, no. 02 (2006): 201–36. http://dx.doi.org/10.1142/s0218396x06003001.

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In many applications, and in particular in seismology, realistic propagation media disperse and attenuate waves. This dissipative behavior can be taken into account by using a viscoacoustic propagation model, which incorporates a complex and frequency-dependent viscoacoustic modulus in the constitutive relation. The main difficulty then lies in finding an efficient way to discretize the constitutive equation as it becomes a convolution integral in the time domain. To overcome this difficulty the usual approach consists in approximating the viscoacoustic modulus by a low-order rational function
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44

Leconte, Roman, Jean-Camille Chassaing, François Coulouvrat, and Régis Marchiano. "Propagation of classical and low booms through kinematic turbulence with uncertain parameters." Journal of the Acoustical Society of America 151, no. 6 (2022): 4207–27. http://dx.doi.org/10.1121/10.0011771.

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The propagation of sonic boom through kinematic turbulence is known to have an important impact on the noise perceived at the ground. In this work, a recent numerical method called FLHOWARD3D based on a one-way approach is used to simulate the propagation of classical and low-boom waveforms. Kinematic turbulence is synthesized following a von Kármán energy spectrum. Two- and three-dimensional (2D and 3D) simulations are compared to experimental measurements, and 2D simulations are found to be slightly less accurate than 3D ones but still consistent with experimental levels around 98% of the ti
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45

Kim, Young Kook, Kazuyuki Hokamoto, and Shigeru Itoh. "A Study on the Consolidation of Cu, Ni / Graphite Powder Using Shock Compaction Method." Materials Science Forum 566 (November 2007): 345–50. http://dx.doi.org/10.4028/www.scientific.net/msf.566.345.

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A shock compaction method using an underwater shockwave is used to consolidate the Cu/graphite and Ni/graphite composites. The copper powder (particle size < 45 m) and nickel powder (particle size < 150 m) were respectively mixed with the graphite powder (particle size < 45 m, purity 99.9%). The propagation phenomenon of underwater shock wave is studied by means of numerical analysis (LS-DYNA 3D) in terms of the magnitude and distribution of shock pressure impinged on the powder surface. The shock pressure of underwater shock wave obtained from shock compaction device is approximately
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46

Yu, Jin, Zehan Liu, Ze He, Xianqi Zhou, and Jinbi Ye. "Fluctuation Characteristic Test of Oblique Stress Waves in Infilled Jointed Rock and Study of the Analytic Method." Advances in Civil Engineering 2020 (January 11, 2020): 1–12. http://dx.doi.org/10.1155/2020/7924742.

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The propagation of stress waves in filled jointed rocks involves two important influencing factors: transmission-reflection phenomena and energy attenuation. In this paper, the split Hopkinson pressure bar (SHPB) test is used to shock the filled rock with joint angles of 0, 30, and 45° and the thickness of 4 mm and 10 mm, respectively, in three different velocities. The wave curves of the incident wave, reflected wave, and transmission are obtained. The effects of the filling angle and joint thickness on wave propagation are analyzed. Based on the propagation characteristics of stress waves in
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47

Zdeshchyts, A. V., and V. M. Zdeshchyts. "Propagation of elastic waves in cross-sectionally heterogeneous rods." IOP Conference Series: Earth and Environmental Science 1415, no. 1 (2024): 012081. https://doi.org/10.1088/1755-1315/1415/1/012081.

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Abstract The article is devoted to measuring the propagation speed of elastic waves in metal rods of variable cross-section. The paper examines the dependence of the speed measure of propagation of elastic waves on the geometric and physical characteristics of the rods. The research methods are based on the use of known statements of the impact theory during the collision of a ball with the end of a metal rod. Solid rods, stepped rods, and rods with axisymmetric holes of different depths were experimentally studied. A piezo sensor connected to a digital oscilloscope was used to record pressure
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48

Yang, Fan, Liugang Li, Zhimin Li, and Pengbo Wang. "Numerical Simulation of Acoustic Wave Generated by DC Corona Discharge Based on the Shock Wave Theory." Applied Sciences 13, no. 16 (2023): 9251. http://dx.doi.org/10.3390/app13169251.

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The audible noise generated by corona discharge has the N-type characteristic at the initial generation stage, and it is a typical shock wave. This shock wave usually only exists around the corona source with a tiny range, making it difficult to obtain its characteristics through experimental measurements. An electrosound-combined simulation of the corona discharge based on the shock wave theory was conducted, and the development process involving the corona discharge, shock wave, and sound wave was simulated. First, the corona was numerically simulated based on the 2D pin–plate axisymmetric h
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49

Yan, Chenglong, Chen Shu, Jiafeng Zhao, et al. "Influences of thermal physical property parameters on operating characteristics of simulated rotating detonation ramjet fueled by C12H23." AIP Advances 12, no. 11 (2022): 115309. http://dx.doi.org/10.1063/5.0101939.

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Two-phase rotating detonation ramjets are considered to be suitable for aerospace applications due to their high thermodynamic cycle efficiency. These engines have an extremely complex internal flow field, in which the liquid fuel undergoes physical and chemical processes such as fragmentation, evaporation, mixing, and combustion; these processes also interact with detonation waves that have significant gradients. This makes it difficult to simulate a three-dimensional (3D) full-process rotating detonation combustion chamber. Here, based on the Euler–Lagrangian simulation method, a 3D numerica
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50

Chukkol, Y. B., I. Bello, and M. Abdullahi. "Non-linear wave propagation in a weakly compressible Kelvin-Voigt liquid containing bubbly clusters." Vestnik Udmurtskogo Universiteta. Matematika. Mekhanika. Komp'yuternye Nauki 33, no. 1 (2023): 171–94. http://dx.doi.org/10.35634/vm230112.

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The effect of bubble-bubble interaction on wave propagation in homogeneous weakly compressible viscoelastic bubbly flow is investigated using the reductive perturbation method. The bubble dynamics equation is derived using the kinetic energy conservation approach. The bubble dynamics and mixture equations are coupled with the equation of state for gas to investigate the shock wave propagation phenomenon in the mixture. A two-dimensional Korteweg-de VriesBurger (KdVB) equation in terms of a pressure profile is derived. It is found that the bubble-bubble interaction has no effect when using the
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