F203 Numerical simulation of mass evacuation and recovery process during against earthquake disaster

2012 ◽  
Vol 2012.25 (0) ◽  
pp. _F-29_-_F-30_
Author(s):  
M. Hori ◽  
L.M.M. Wijarthne ◽  
T. Ichimura
Keyword(s):  
Numerical Simulation ◽  
Recovery Process ◽  
Earthquake Disaster ◽  
Mass Evacuation

Numerical Simulation of SAGD Recovery Process in Presence of Shale Barriers, Thief Zones, and Fracture System

2013 ◽  
Vol 31 (14) ◽  
pp. 1454-1470 ◽  
Author(s):  
T. Q. C. Dang ◽  
Z. Chen ◽  
T. B. N. Nguyen ◽  
W. Bae ◽  
C. L. Mai
Keyword(s):  
Numerical Simulation ◽  
Recovery Process ◽  
Fracture System

Numerical Simulation Study on the Recovery Process of Autonomous Underwater Vehicle

2021 ◽  
Author(s):  
Weigang Huang ◽  
Donglei Zhang ◽  
Jiawei Yu ◽  
Tao He ◽  
Xianzhou Wang
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Autonomous Underwater Vehicle ◽  
Flow Characteristics ◽  
Recovery Process ◽  
Underwater Vehicle ◽  
Hydrodynamic Performance ◽  
Time Step ◽  
Convergence Test ◽  
Motion Paths

Abstract AUV (Autonomous Underwater Vehicle) recovery is considerably influenced by the nearby flow field and simulations of AUV in different motion paths in the wake of a submarine with a propeller are presented in this paper. A commercial CFD solver STAR CCM+ has been used to research the motion and flow characteristics of AUV, which using the advanced computational continuum mechanics algorithms. The DARPA (Defense Advanced Research Projects Agency) SUBOFF Submarine (L1 = 4.356m) propelled with INSEAN (Italian Ship Model Basin) E1619 propeller is used in this study, and the self-propulsion characteristics of the propeller at an incoming flow velocity of 2.75m/s are obtained through numerical simulation and results are compared with the available experimental data to prove the accuracy of the chosen investigation methodology. A grid/time-step convergence test is performed for verification study. AUV (L2 = 0.4356m) is a smaller-scale SUBOFF without a sail, which approaches the submarine in different motion paths in the submarine wake at a relative speed combined with the dynamic overlapping grid technology. The hydrodynamic performance of the AUV when approaching the submarine and the velocity distribution of the surrounding flow field are analyzed, which provides a useful reference for underwater recovery of the AUV.

An Unsteady Numerical Investigation on the Hysteresis Stall Loop of a Counter-Rotating Compressor

2011 ◽  
Author(s):  
Zhuoqi Wang ◽  
Wei Yuan ◽  
Qiushi Li ◽  
Yajun Lu
Keyword(s):  
Numerical Simulation ◽  
Recovery Process ◽  
Characteristic Line ◽  
Rotor Speed ◽  
Stall Inception ◽  
Rotating Speed ◽  
Flow Phenomena ◽  
Stall Cells ◽  
Unsteady Numerical Simulation ◽  
Good Agreement

For investigating the flow phenomena in the stall process, a full annular unsteady numerical simulation has been carried out on a low speed counter-rotating compressor. The numerical results are in good agreement with experimental results. According to the CFD results, the stall inception was found in the tip region of the front rotor. The rotating speed of stall cells in the front rotor are about 41% of the rotor speed and the direction is the same with the rotor rotating direction. The stall cells occupies about 20% of the blade span away from the casing wall when the compressor is in deep stall. The flow phenomena is well captured which explained why the compressor characteristic line appears as a hysteresis loop in the stall inception-recovery process.

A Review on Recent Advances in the Numerical Simulation for Coalbed-Methane-Recovery Process

2007 ◽  
Vol 10 (06) ◽  
pp. 657-666 ◽  
Author(s):  
Xiaorong R. Wei ◽  
Guoxiong X. Wang ◽  
Paul Massarotto ◽  
Sue D. Golding ◽  
Victor Rudolph
Keyword(s):  
Numerical Simulation ◽  
Coalbed Methane ◽  
Recovery Process ◽  
Methane Recovery ◽  
Recent Advances

scholarly journals Theoretical Analysis and Numerical Simulation of the Graben Fault Instability Mechanism

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Qihua Ma ◽  
Shiwei Niu ◽  
Huaguo Wang ◽  
Weixiang Ma ◽  
Lihui Chi ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Rock Burst ◽  
Recovery Process ◽  
Instability Mechanism ◽  
Geological Structures ◽  
Ground Pressure ◽  
Working Face ◽  
Shear Beam ◽  
Rock Strata ◽  
Elastic Shear

The rock burst caused by geological structures is abrupt and destructive, and the special structure of a graben fault decides the uniqueness of mine ground pressure in the mining process. By simplifying the graben fault structure, the evolution law of roof stress during the recovery process was studied based on the theory of the elastic shear beam. The change laws of stress field and displacement nearby the fault during the advancement process of the working face were explored through a numerical simulation, and the instability mechanism and laws of rock strata nearby this graben fault were revealed. This study will be of great significance for preventing and controlling the rock burst in the graben fault.

scholarly journals An SIR rumor pairwise model with spreading age

2020 ◽  
Vol 14 (03) ◽  
pp. 148-162
Author(s):  
Yao Liu ◽  
Jinxian Li
Keyword(s):  
Numerical Simulation ◽  
Differential Equations ◽  
Complex Network ◽  
Hyperbolic System ◽  
Recovery Time ◽  
Reproduction Number ◽  
Recovery Process ◽  
Distribution Functions ◽  
Rumor Spreading ◽  
Pairwise Model

In this paper, we extend the classical rumor model with non-Markovian recovery process in a complex network. We follow the ideas from R\"{o}st to analyze the pairwise model; then, the hyperbolic system can be transformed into integro-differential equations. For the rumor model, the reproduction number is obtained. Next, we use numerical simulation to verify the accuracy of the result. In the end, we focus on how the three different distributions of recovery time with spreading age influence on rumor model. The result illustrates the significant effect of different distribution functions on the process of rumor spreading.

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