Frontiers of Discontinuous Numerical Methods and Practical by Guangqi Chen, Yuzo Ohnishi, Lu Zheng, Takeshi Sasaki PDF

By Guangqi Chen, Yuzo Ohnishi, Lu Zheng, Takeshi Sasaki

ISBN-10: 1138001104

ISBN-13: 9781138001107

ISBN-10: 1315849283

ISBN-13: 9781315849287

Analysis of enormous deformation, inflexible physique circulation and pressure or tension for discontinuous fabrics is usually required for undertaking designs and plans within the fields of engineering and catastrophe prevention. Many numerical simulation and research tools were built for the requirement from technology and know-how humans considering the fact that Seventies. between them, Discontinuous Deformation research (DDA), Numerical Manifold strategy (NMM), Key Block conception (KB), Distinct/Discrete point tools (DEM), relocating debris Semi-implicit strategy (MPS) and Smoothed Particle Hydrodynamics procedure (SPH) are standard potent equipment and feature drawn an increasing number of recognition of the researchers in lots of various fields. The discrete research is extra average than continuum research to deal with geologic fabrics which we use as engineering fabrics. development of pcs and advent of specified rules helped us to strengthen many beneficial new numerical tools as indexed above.

Frontiers of Discontinuous Numerical equipment and functional Simulations in Engineering and catastrophe Prevention contains 14 keynote papers, fifty four complete papers and four prolonged abstracts provided on the eleventh foreign convention on research of Discontinuous Deformation (ICADD-11, Fukuoka, Japan, 27-29 August 2013). The contributions hide the newest advances in all points of discontinuous numerical tools, from conception to perform, together with new principles and the newest advancements. the most schemes are on DDA, NMM and KB following the culture of the convention sequence. in the meantime, DEM, MPS, SPH, Meshless equipment and a few different numerical tools also are incorporated. The booklet is a must have for these teachers and pros attracted to the cutting-edge in know-how and  numerical equipment relating to the above pointed out methods.

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Extra info for Frontiers of Discontinuous Numerical Methods and Practical Simulations in Engineering and Disaster Prevention

Sample text

The parameters and the simulation cases for 3D DDA. 36 70 min, 80 min and 2GPa/m and 5GPa/m for the cubic shapes were used as the models. Figure 22 shows the A site 3D DDA model and the trees are represented using lateral columns on the slope surface. Figure 23 shows the trajectory of the 12 polygon falling rock with 99 trees and the falling block contacts with trees and changes direction at seven points. Figure 24 shows the velocities between observations and the 3D DDA results. The ball shape falling stone is good match with observation velocities compared with the 3D DDA.

We call this behavior as ping-pong effect in this paper. Thus, an object on the ground can get higher and higher due to a sequence of collisions caused by earthquake, which behaves as an athlete bouncing on a trampoline. We call this kind of movement as trampoline motion. We also find that the acceleration of an object can obtain more than two times that of the ground because of the so-called ping-pong effect. If an object is bouncing off the ground due to the ground impaction, the upgoing acceleration would be larger than 1 g, and its downgoing acceleration would be 1 g because of free fall motion back to the ground.

Considering a single wave, we divide one period into two phases: P-phase and N-phase. The upward part of the period is called P-phase and the downward part is called N-phase. If the object is touching the ground during the P-phase, it could get additional energy from the impact of the ground motion. On the other hand, if the object is touching the ground during the N-phase, it could lose the energy due to the longer contact time because the ground is moving in the same direction. It is important to notice that the object can obtained as large as two times the velocity and several times the acceleration of the ground from the impact of the vibrating ground.

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Frontiers of Discontinuous Numerical Methods and Practical Simulations in Engineering and Disaster Prevention by Guangqi Chen, Yuzo Ohnishi, Lu Zheng, Takeshi Sasaki


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