Mechanical energy evolution in the propagation of rock avalanches using field survey and numerical simulation

Landslides ◽  
2021 ◽  
Author(s):  
Yunfeng Ge ◽  
Huiming Tang ◽  
Changdong Li
Keyword(s):  
Numerical Simulation ◽  
Field Survey ◽  
Mechanical Energy ◽  
Energy Evolution ◽  
Rock Avalanches

FIELD SURVEY NEAR DETACHED BREAKWATERS AND NUMERICAL SIMULATION OF MORPHOLOGICAL CHANGES USING XBEACH MODEL

2021 ◽  
Vol 77 (2) ◽  
pp. I_919-I_924
Author(s):  
Yuko ITO ◽  
Kota OHIZUMI ◽  
Kunihiko ISHIBASHI ◽  
Ryota NAKAMURA ◽  
Shigeru KATO
Keyword(s):  
Numerical Simulation ◽  
Field Survey ◽  
Morphological Changes

scholarly journals Energy Evolution Law of Marble Failure Process Under Different Confining Pressures Based on Particle Discrete Element Method

2021 ◽  
Vol 8 ◽  
Author(s):  
Yan-Shuang Yang ◽  
Wei Cheng ◽  
Zhan-Rong Zhang ◽  
Hao-Yuan Tian ◽  
Kai-Yue Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Energy Dissipation ◽  
Axial Strain ◽  
Triaxial Compression ◽  
Failure Process ◽  
Rock Failure ◽  
Biaxial Compression ◽  
Energy Evolution ◽  
Confining Pressures ◽  
Energy Dissipated

The energy dissipation usually occurs during rock failure, which can demonstrate the meso failure process of rock in a relatively accurate way. Based on the results of conventional triaxial compression experiments on the Jinping marble, a numerical biaxial compression model was established by PFC2D to observe the development of the micro-cracks and energy evolution during the test, and then the laws of crack propagation, energy dissipation and damage evolution were analyzed. The numerical simulation results indicate that both the crack number and the total energy dissipated during the loading process increase with confining pressures, which is basically consistent with the experiment results. Two damage variables were presented in terms of the density from other researchers’ results and energy dissipation from numerical simulation, respectively. The energy-based damage variable varies with axial strain in the shape of “S,” and approaches one more closely than that based on density at the final failure period. The research in the rock failure from the perspective of energy may further understand the mechanical behavior of rocks.

FIELD SURVEY AND NUMERICAL SIMULATION OF FLUVIAL INUNDATION AND SEDIMENT DEPOSITION DUE TO DYKE BREACH OF CHIKUMA RIVER

2020 ◽  
Vol 76 (2) ◽  
pp. I_883-I_888
Author(s):  
Kenji KAWAIKE ◽  
Makoto TAKEDA ◽  
Masashi TOYOTA ◽  
Hiroshi YOKAWA ◽  
Kazuki YAMANOI ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Field Survey ◽  
Sediment Deposition

scholarly journals The investigation of the cavitation processes in the radial labyrinth pump

2018 ◽  
Vol 8 (1) ◽  
pp. 322-328
Author(s):  
Moloshnyi Oleksandr ◽  
Szulc Przemyslaw
Keyword(s):  
Numerical Simulation ◽  
Cross Section ◽  
Volume Fraction ◽  
Mechanical Energy ◽  
Circular Cross Section ◽  
Back Side ◽  
Numerical Investigations ◽  
Numerical Research ◽  
The Moment ◽  
Velocity Pressure

Abstract The paper concerns the analysis of the cavitation processes in the flow passages of the radial labyrinth pump. The object of the analysis contains the active (moving) and the passive (stationary) discs with straight channels trajectory and semi-circular cross-section. The conversion of the mechanical energy into hydraulic based on the exchange of the momentum between the liquid remaining in the moving and the stationary areas of the discs as well as on the centrifugal increase of the moment of momentum. The analysis of the cavitation processes was realized by the experimental research and the numerical simulation. In the article, the comparison of the cavitation characteristics was carried out. The numerical simulation had given similar results to the experimental one, the process of the cavitation was visualized. Furthermore, numerical investigations helped to describe the cavitation development. The results of the numerical research such as the distributions of the velocity, pressure and vapor volume fraction in the passages were presented. At first, cavitation starts on the back side and on the top of the wall between channels of the active disc. Further, the cavitation areas are growing along the axis of the channels. Eventually, they separation was observed and vortices of the vapour-gas mixture in the middle of the channels were formed. This phenomenon is so-called super cavitation vortices.

Analysis on the Cycle Characteristics of Dual Swash Plate Stirling Engine

2013 ◽  
Vol 724-725 ◽  
pp. 946-950 ◽  
Author(s):  
Xu Dong Han ◽  
Wei Zheng Xu
Keyword(s):  
Numerical Simulation ◽  
Theoretical Model ◽  
Mechanical Energy ◽  
Stirling Engine ◽  
Design Parameters ◽  
Swash Plate ◽  
Fundamental Information ◽  
Waste Energy

Dual swash plate Stirling engine was designed to convert the waste energy of the flame to mechanical energy. A Stirling model has been developed and used to optimize the performance and design parameters of the engine. The Schmidt analysis is used to obtain the internal engine pressure for the adiabatic analysis. The objective of this paper is to provide fundamental information and present a detailed feasibility of dual the swash plate mechanism. Based on the theoretical model and numerical simulation, the Stirling power is calculated. The result shows that the swash plate mechanism could be applied in practice.

Application ANSYS CFX in Modeling Turbine Blade

2009 ◽  
Vol 626-627 ◽  
pp. 593-598
Author(s):  
Li Feng Yang ◽  
Shu Ren Zhang ◽  
W.N. Liu ◽  
Yu Yang ◽  
Y.J. Zhang
Keyword(s):  
Numerical Simulation ◽  
Turbine Blade ◽  
Mechanical Energy ◽  
Main Shaft ◽  
Geometric Data ◽  
Ansys Cfx ◽  
Simulation Calculation ◽  
Main Component

The main component of turbine is made up of stator and rotor, w hose function is to transform liquid energy in to mechanical energy on the main shaft. ANSYS CFX－BladeGen is applied to model turbine , ANSYS CFX－TurboGrid is applied to create a mesh for an turbine blade and then numerical simulation calculation on the obtained model is conducted. In the fact, the result of the above calculation indicates that ANSYS CFX BladeGen is more convenient and swift to fulfill the modeling request of turbine blade. When the performance of the turbine blade is achieved, these blades’ geometric data can be directly exported to Pro/ENGINEER or AutoCAD so as to further CAD and CAM.

Calibration of a Piezoelectric Transducer through Laser Measurements and Numerical Simulation

2019 ◽  
Vol 24 (1) ◽  
pp. 39-48
Author(s):  
SeyedBijan Mahbaz ◽  
Giovanni Cascante ◽  
Maurice B. Dusseault
Keyword(s):  
Numerical Simulation ◽  
Piezoelectric Transducer ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Stress Wave Propagation ◽  
Laser Vibrometer ◽  
Output Displacement ◽  
Displacement Signal ◽  
Non Linear ◽  
Voltage Signal

A piezoelectric transducer is an electromechanical sensor which converts electrical energy (voltage signal) to mechanical energy (displacement signal) and vice versa by taking advantage of the piezoelectric crystal. Depending on the physical combination of transducer parts, sensors may have a linear or non-linear response to the input signal. In seismic tests such as ultrasonic non-destructive testing (NDT) methods, analyzing stress wave propagation through the specimen gives an assessment of its condition. The signal attenuation is an important parameter to assess the condition of specimen which can be done by having the displacement signal as an output. However, instead of the displacement signal, the piezoelectric transducer provides the voltage signal as an output. Therefore, to get reliable and accurate results, it is essential to calibrate the transducers. An appropriate calibration results in a suitable Transfer Function (TF) which can be used to properly calculate the displacement signal. In this study, the output displacement of a 1 MHz piezoelectric transducer is measured using a laser vibrometer with a nanometer resolution. Measurements and calculated TF showed at frequencies of 0.1, 1, and 1.5 MHz, TF values are 0.8, 0.08, and 0.2 respectively which is a non-linear relation between displacement (absolute signal) and voltage (relative signal) as it was expected. Then, numerical simulation is implemented as part of this study to simulate all electrical and mechanical components of the piezoelectric transducer. The simulation was verified with the absolute displacement measurements result from the laser vibrometer.

scholarly journals Field survey and numerical simulation of the 21 November 2004 tsunami at Les Saintes (Lesser Antilles)

2008 ◽  
Vol 35 (12) ◽  
pp. n/a-n/a ◽  
Author(s):  
Anne Le Friant ◽  
Philippe Heinrich ◽  
Georges Boudon
Keyword(s):  
Numerical Simulation ◽  
Field Survey ◽  
Lesser Antilles ◽  
Les Saintes ◽  
2004 Tsunami
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