Numerical simulation of arbitrary holes in orthotropic media by an efficient computational method based on adaptive XIGA

2019 ◽  
Vol 229 ◽  
pp. 111387 ◽  
Author(s):  
Xin Chen ◽  
Jiming Gu ◽  
Tiantang Yu ◽  
Ling Qiu ◽  
Tinh Quoc Bui
Keyword(s):  
Numerical Simulation ◽  
Computational Method ◽  
Orthotropic Media

scholarly journals Mechanism of Rock Burst Revealed by Numerical Simulation and Energy Calculation

2020 ◽  
Vol 2020 ◽  
pp. 1-15 ◽  
Author(s):  
Wenlong Zhang ◽  
Nianjie Ma ◽  
Ji Ma ◽  
Chen Li ◽  
Jianju Ren
Keyword(s):  
Numerical Simulation ◽  
Force Field ◽  
Rock Burst ◽  
Elastic Energy ◽  
Computational Method ◽  
Energy Calculation ◽  
Monitoring And Control ◽  
Mass Release ◽  
The Difference ◽  
And Control

We propose a new computational method to calculate the storage elastic energy value of surrounding rocks based on numerical simulation and theoretical calculation. By calculating the difference value in energy under different force states and comparing them with the energy level when rock burst occurs, we get the mechanism of rock burst: when roadway and surrounding rocks are in the condition of large ratio bias force field, certain triggering stress causes mass release of the elastic energy of surrounding rocks around the roadway, and when the energy reaches a certain level, rock burst will occur. We also put forward the specific force field conditions and triggering stress values of rock burst, which is of great guiding significance for the mechanism disclosure, monitoring, and control of rock burst.

scholarly journals Study on the Most Suitable Computational Method for Diffusion Numerical Simulation.

1996 ◽  
pp. 53-68
Author(s):  
Toshimitsu Komatsu ◽  
Koji Asai ◽  
Koichiro Ohgushi ◽  
Koichiro Yoshimura
Keyword(s):  
Numerical Simulation ◽  
Computational Method

The Research of Subspan Oscillation and Configuration of Spacer for Transmission Line

2012 ◽  
Vol 614-615 ◽  
pp. 1855-1861
Author(s):  
Yu Xian Di ◽  
Kuan Jun Zhu ◽  
Cao Lan Liu
Keyword(s):  
Numerical Simulation ◽  
Transmission Lines ◽  
Simulation Method ◽  
Computational Method ◽  
Analysis Model ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
The Finite Element Analysis ◽  
Computer Aided ◽  
Calculation Procedures

Based on the summarization of domestic and foreign experience, the computational method of spacer configuration was developed in order to depress sub-span oscillation principally. The requirements of the reverse recovery characteristics were considered. The computer-aided calculation procedures were programmed. The finite element analysis model of sub-span oscillation for cable-spacer system was established. The inherence modal and amplitude for sub-span oscillation of bundled transmission lines were calculated by using numerical simulation method. The dynamic configurations were analyzed by using the parameters of the cable and spacer obtained from vibration testing.

LES-Based Numerical Simulation of Flow Noise for UUV with Full Appendages

2013 ◽  
Vol 631-632 ◽  
pp. 879-884 ◽  
Author(s):  
Shi Yao ◽  
Pan Guang ◽  
Huang Qiao Gao
Keyword(s):  
Numerical Simulation ◽  
Noise Level ◽  
Geometric Model ◽  
Simulation Method ◽  
Underwater Vehicle ◽  
Computational Method ◽  
Computational Region ◽  
Flow Noise ◽  
Unmanned Underwater Vehicle ◽  
Eddy Simulation

Numerical simulation of flow field and flow noise was carried out on SUBOFF with Lighthill acoustical analogy and large eddy simulation method. The results agreed well with the numerical and experimental results obtained from published literature. The validation of the computational method of flow noise used in this paper was carried out. The geometric model was established for the unmanned underwater vehicle with full appendages and the flow field’s computational region discretization was carried out by using structural grid. Numerical simulation of flow noise for unmanned underwater vehicle with full appendages was taken. The numerical results show that the angle of attack has little effect on the flow noise level of the vehicle while the angle ranged from 0° to 4°. Compared with the “＋”-type rudders, the flow noise level of the underwater vehicle with “X”-type rudders is about 3dB lower.

Study on Flow Field Character Around Bypass Crossover Sub in Fracturing Process of Horizontal Wells

2009 ◽  
Author(s):  
Zunce Wang ◽  
Yan Xu ◽  
Sen Li ◽  
Fengxia Lv ◽  
Wei Li
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Reverse Flow ◽  
Tangential Velocity ◽  
Horizontal Wells ◽  
Computational Method ◽  
Wall Area ◽  
Fracturing Process ◽  
Breadth Ratio ◽  
The Impact

Based on Reynolds Stress Model (RSM), numerical simulation of flow field around Bypass Crossover Sub in the fracturing process of horizontal wells is carried out by Computational Fluid Dynamics (CFD) analysis. Distribution rules of axial velocity, tangential velocity and radial velocity of fluid field in calculation region are achieved. Results show that strong vortexes and reverse flow exist at the slots on Bypass Crossover Sub, which brings the impact of the fluid on the wall at certain angle. Impacting velocity and angle at different positions of the wall are studied in detail. A Laser Doppler Anemometer (LDA) is applied to examine the flow field velocity distribution. Experimental results agree well with the numerical simulation results, which prove the validity of turbulence model and computational method. Numerical simulation is carried out at different Length-Breadth ratio of slots on the Bypass Crossover Sub. Effect of the Length-Breadth ratio on the scale of vortexes, speed distributions and flow field near the wall area is discussed. All of these will provide some reference on structural optimization and the analysis of erosion.

The Numerical Simulation of the Single Abrasive Motion Law in the Environment of Structural Surface

2010 ◽  
Vol 102-104 ◽  
pp. 573-577 ◽  
Author(s):  
Shi Ming Ji ◽  
Bao Li Ma ◽  
Da Peng Tan ◽  
Qiao Ling Yuan
Keyword(s):  
Numerical Simulation ◽  
Boundary Layer ◽  
Flow Field ◽  
Surface Effect ◽  
Computational Method ◽  
Motion Trajectory ◽  
Two Phase ◽  
Leading Role ◽  
Turbulence Flow ◽  
Flow Coupling

As far as the controllability of turbulence flow field surface effect of the soft abrasive flow was concerned, to begin with the analysis of the motion of the particle in the flow field, the paper studied the motion law of particle in the flow field, especially in the boundary layer. Based on the fluid-solid two-phase flow coupling style, it established the single particle dynamics model. Then it established the realizable k-ε model, in the light of the numerical simulation of turbulent flow. With the adoption of the computational method of SIMPLEC, it asked for the velocity and the pressure of fluid in the U-shaped flow passage, the velocity and the motion law of particles with different granularities and velocity, in the boundary layer. Experimentation results tell us that the original velocity plays a leading role in the motion trajectory of particles. The diameter influenced the particles motion trajectory in some degree.

scholarly journals COMPUTATIONAL METHOD AND NUMERICAL SIMULATION OF TEMPERATURE FIELD FOR LARGE-SPACE STEEL STRUCTURES IN FIRE

2014 ◽  
pp. 151-178 ◽  
Author(s):  
Sheng-gang Fan ◽  
◽  
Gan-Ping Shu ◽  
Guang-Jun She ◽  
J.Y. Richard Liew ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Steel Structures ◽  
Computational Method ◽  
Large Space ◽  
In Fire

Key Protecting Strata Criterion of Water Conservation Mining and its Application

2013 ◽  
Vol 671-674 ◽  
pp. 2621-2625
Author(s):  
Ben Qiang Shi ◽  
Jie Zhang
Keyword(s):  
Numerical Simulation ◽  
Coal Mining ◽  
Computational Result ◽  
Water Conservation ◽  
Computational Method ◽  
Overburden Rock ◽  
Simulation Test ◽  
Mechanics Model ◽  
Mining Water ◽  
Fixed Beam

The entironment is deteriorating increasingly in north of Shaanxi Yushenfu mine with coal mining cosmically. The causation is the lapse of groundwater owing to mining. Water conservation mining has been the exigent request. Aiming at the need of water conversation mining in north of Shaanxi shallow seam mine, this article found key protecting strata criterion of water conservation mining according as the moving law of overburden rock and the mechanics model of fixed beam. The water conservation mine method in different overburden rock mine was put forward with the condition of no destroying water protecting strata. The feasibility of the key protecting strata criterion was validated using the choice of water conservation mine method in two different overburden rock frame mine in north of Shaanxi shallow seam mine. At the time, validating the computational result applying similitude simulation test and numerical simulation. The key protecting criterion offers a theoretic computational method for the choice of water protecting mining in different overburden rock frame mine.

Application of the Immersed Boundary Method and Direct Numerical Simulation for the Heat Transfer From Particles

2009 ◽  
Author(s):  
Zhi-Gang Feng ◽  
Efstathios E. Michaelides
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Density Function ◽  
Fluid Phase ◽  
Solid Particles ◽  
Computational Method ◽  
Immersed Boundary ◽  
Force Density ◽  
Particulate Flows

A combination of the Direct Numerical Simulation (DNS) with the Immersed Boundary (IB) method has been developed to solve the momentum and heat transfer equations for the computation of thermal convection in particulate flows. This numerical method makes use of a finite difference method in and uses a regular Eulerian grid to solve the modified momentum and energy equations for the entire flow region simultaneously. In the region that is occupied by the solid particles, a second particle-based Lagrangian grid is used, which tracks all the particles, and a force density function or an energy density function is introduced to represent the momentum interaction or thermal interaction between the particulate phase and fluid phase. The numerical methods presented have been validated by comparing the results of the simulation with similar numerical results obtained by others. Among the advantages of this computational method is that it may be used for the determination, stipulation and validation of boundary conditions in particulate flows that may be used with larger Eulerian codes.

Water uptake by substituted amylose tablets: experimentation and numerical simulation

2009 ◽  
Vol 00 (00) ◽  
pp. 090904073309027-8
Author(s):  
H.W. Wang ◽  
S. Kyriacos ◽  
L. Cartilier
Keyword(s):  
Numerical Simulation ◽  
Water Uptake
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