Numerical Simulation Study on Self-Settlement Process of High Embankment

2013 ◽  
Vol 671-674 ◽  
pp. 1221-1224
Author(s):  
Yan Zhang ◽  
Yong Wang
Keyword(s):  
Numerical Simulation ◽  
Simulation Study ◽  
Reference Value ◽  
The Self ◽  
Maximum Settlement ◽  
Simulation Results ◽  
Embankment Height

This paper uses the FLAC software to simulate self-settlement of high embankment. Analysis and discussion on the simulation results are performed. The final results indicate that the self-settlement of high embankment can't be ignored, the maximum settlement within the embankment occurs at about （1/3～1/2）embankment height. This conclusion has a reference value for guiding the actual construction.

scholarly journals An Intelligent Evaluation Method to Analyze the Competitiveness of Airlines

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Jun Zhao ◽  
Xumei Chen
Keyword(s):  
Neural Network ◽  
Prior Knowledge ◽  
Evaluation Method ◽  
Standard Sample ◽  
Reference Value ◽  
The Self ◽  
Index Data ◽  
Som Neural Network ◽  
Simulation Results ◽  
Self Organizing

An intelligent evaluation method is presented to analyze the competitiveness of airlines. From the perspective of safety, service, and normality, we establish the competitiveness indexes of traffic rights and the standard sample base. The self-organizing mapping (SOM) neural network is utilized to self-organize and self-learn the samples in the state of no supervision and prior knowledge. The training steps of high convergence speed and high clustering accuracy are determined based on the multistep setting. The typical airlines index data are utilized to verify the effect of the self-organizing mapping neural network on the airline competitiveness analysis. The simulation results show that the self-organizing mapping neural network can accurately and effectively classify and evaluate the competitiveness of airlines, and the results have important reference value for the allocation of traffic rights resources.

ACTIVE TRACKING CONTROL OF THE HYPERCHAOTIC LORENZ SYSTEM

2008 ◽  
Vol 22 (19) ◽  
pp. 1859-1865 ◽  
Author(s):  
XINGYUAN WANG ◽  
DAHAI NIU ◽  
MINGJUN WANG
Keyword(s):  
Numerical Simulation ◽  
Tracking Control ◽  
Chaotic Systems ◽  
Lorenz System ◽  
The Self ◽  
Hyperchaotic System ◽  
Reference Signals ◽  
Tracking Controller ◽  
Hyperchaotic Lorenz System ◽  
Simulation Results

A nonlinear active tracking controller for the four-dimensional hyperchaotic Lorenz system is designed in the paper. The controller enables this hyperchaotic system to track all kinds of reference signals, such as the sinusoidal signal. The self-synchronization of the hyperchaotic Lorenz system and the different-structure synchronization with other chaotic systems can also be realized. Numerical simulation results show the effectiveness of the controller.

Effects of surface roughness on self-excited cavitating water jet intensity in the organ-pipe nozzle: Numerical simulations and experimental results

2019 ◽  
Vol 33 (27) ◽  
pp. 1950324
Author(s):  
Xiangdong Han ◽  
Yong Kang ◽  
Deng Li ◽  
Weiguo Zhao
Keyword(s):  
Numerical Simulation ◽  
Surface Roughness ◽  
Kinetic Energy ◽  
Turbulent Kinetic Energy ◽  
Energy Intensity ◽  
Volume Fraction ◽  
Water Jet ◽  
The Self ◽  
Simulation Results ◽  
Organ Pipe

This study was conducted to investigate effects of surface roughness on self-excited cavitating water jet intensity in an organ-pipe nozzle. Roughness average (Ra) values are 0.8, 1.6, 3.2, 6.3, 12.5, and 25 [Formula: see text]m, respectively. Numerical simulation results indicate that at inlet pressure of 10 MPa, the maximum, minimum, and real-time pressures in the self-excited oscillation chamber reach their respective peak values. The turbulent kinetic energy intensity in the external flow region is also most intense at this point, the vapor volume fraction in orifice is the highest, the vortex distribution scope in the orifice is the largest under [Formula: see text], and the self-excited cavitating water jet intensity is the strongest. The opposite variations emerge at [Formula: see text] compared to those of [Formula: see text], where the intensity is weakest. Pressure varies only slightly as Ra varies from 0.8 [Formula: see text]m to 6.3 [Formula: see text]m. Turbulent kinetic energy intensity behaves similarly as Ra increases from 0.8 [Formula: see text]m to 3.2 [Formula: see text]m. At [Formula: see text], it was weaker than at Ra = 0.8–3.2 [Formula: see text]m. Similarly, there are only slight differences in vapor volume fraction and vortex distribution scope with Ra from 0.8 [Formula: see text]m to 6.3 [Formula: see text]m. The intensities at Ra = 0.8–3.2 [Formula: see text]m are similar, and weaker at Ra = 6.3 [Formula: see text]m. Pressure values are maximal at inlet pressure of 20 MPa, turbulent kinetic energy intensity is most intense, vapor volume fraction is highest, vortex distribution scope is largest under [Formula: see text] [Formula: see text]m, and intensity is strongest. Distinctions among pressure, turbulent kinetic energy intensity, vapor volume fraction, and vortex distribution scope values with Ra from 0.8 [Formula: see text]m to 3.2 [Formula: see text]m are slight. Differences in the corresponding intensities are also slight; all decrease with Ra from 12.5 [Formula: see text]m to 25 [Formula: see text]m as the intensity gradually weakens. Numerical simulation results were validated by comparison against corresponding experimental phenomena.

Numerical Simulation Study of Soluble and Conservative Liquid Chemicals Diffusion in Tidal River

2013 ◽  
Vol 864-867 ◽  
pp. 1427-1432
Author(s):  
Jian Wei Zhang ◽  
Wan Qing Wu
Keyword(s):  
Numerical Simulation ◽  
Simulation Study ◽  
Hydrodynamic Model ◽  
Moving Boundary ◽  
Transport Model ◽  
Three Dimensional ◽  
Concentration Field ◽  
Pollutant Transport ◽  
Tidal River ◽  
Simulation Results

Based on three-dimensional hydrodynamic model, moving boundary technique and embedded pollutant transport model, the concentration field of the soluble and conservative liquid chemicals spilled into the tidal river was calculated and the chemicals movement around a jetty at DA Liaohe was simulated. By analyzing the simulation results, the chemicals motion law with tide and their concentration field on and in water were deduced.

A Study of Formation Mechanism of the Spiral Mark Defect in Cone-Type Rotary Piercing Process

2009 ◽  
Vol 16-19 ◽  
pp. 601-606
Author(s):  
Hua Gui Huang ◽  
Wei Wang ◽  
Feng Shan Du
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Formation Mechanism ◽  
Simulation Study ◽  
Axial Load ◽  
Tube Surface ◽  
Rigid Plastic ◽  
Cone Type ◽  
Simulation Results

The spiral mark is one of the quality defects on the tube surface in cone-type rotary pericing process. In this paper, the numerical simulation study was carried out for cone-type rotary piercing process using rigid-plastic finite element method. From the simulation results, the axial load applied on piercing plug and mandrel bar were then obtained. Taking the elastic deformation of mandrel bar into consideration, the variation of plug location under axial load during pericing process and the non-homogeneous wall thickness were investigated. The formation mechanism of the spiral mark on the tube surface can be found in the obtained results.

Optimization by Numerical Simulation of the Focusing Properties of Self-Magnetically Insulated Ion Diodes

1991 ◽  
Vol 02 (01) ◽  
pp. 536-540
Author(s):  
THOMAS WESTERMANN
Keyword(s):  
Numerical Simulation ◽  
Computer Simulation ◽  
Power Density ◽  
The Self ◽  
Anode Surface ◽  
Two Dimensional ◽  
Simulation Results ◽  
Focusing Properties

We present two-dimensional electromagnetic computer simulation results performed in order to investigate the focusing properties of self-magnetically insulated ion diodes. It has been shown computationally that in the case of the self-magnetically insulated bθ-diode the power density can be improved by a factor 10 by changing the anode surface.

Self-induced erosion and spectral breaking of high-power microwave pulses

2000 ◽  
Vol 63 (4) ◽  
pp. 329-341 ◽  
Author(s):  
D. ANDERSON ◽  
A. KIM ◽  
M. LISAK ◽  
K. MADSEN
Keyword(s):  
Numerical Simulation ◽  
High Power ◽  
Microwave Pulse ◽  
The Self ◽  
Pulse Spectrum ◽  
High Power Microwave ◽  
Microwave Pulses ◽  
Simulation Results ◽  
Power Microwave ◽  
Breakdown Plasma

An analysis is made of the phenomenon of self-induced erosion and spectral breaking of ionizing high-power microwave pulses propagating in a gas. The analysis describes in an analytically explicit and physically clear way the consistent interaction between the microwave pulse and the self-induced breakdown plasma. In particular, it clarifies, both qualitatively and quantitatively, the mechanisms behind the pulse erosion and the spectral breaking phenomenon, i.e. the splitting of the pulse spectrum into a redshifted and a blueshifted peak as observed in numerical simulation results as well as in experiments.

Numerical Simulation Study of the Impellers of the Centrifugal Pump Based on Different Turbulence Models

2013 ◽  
Vol 423-426 ◽  
pp. 2049-2053 ◽  
Author(s):  
Ao Hui Guo ◽  
Yong Zhong Zeng ◽  
Xiao Bing Liu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Centrifugal Pump ◽  
Simulation Study ◽  
Turbulence Models ◽  
Centrifugal Pumps ◽  
Ansys Software ◽  
Sst Model ◽  
Simulation Results ◽  
Actual Test

The Computational Fluid (CFD) technology has been successfully used in the numerical simulation of the turbulent flow of centrifugal pump.In this article , we carry on the experiment by using uses ANSYS software,based on the standard k-ε model, SST model and BSL model , to get the the flow field of the numerical simulationof the impeller .We found that the simulation results and the actual results are different under different turbulence models. Then we can draw out the Q-η curve and compare it with the actual test data.Compared with other turbulence models, The SST model is more suitable for the models of centrifugal pumps in the article.Furthermore,we list the pressure contours and velocity vectors for pumps discussed in the paper under the optimal model.The process can provide a theoretical reference for the optimization and further study of the centrifugal pump in the future.

scholarly journals Numerical Simulation of Random Cavitation Suppression Based on Variable NACA Airfoils

2021 ◽  
Vol 11 (24) ◽  
pp. 11618
Author(s):  
Weidong Shi ◽  
Zhouhao Shi ◽  
Zhanshan Xie ◽  
Qinghong Zhang ◽  
Yongfei Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Working Conditions ◽  
Cavitation Erosion ◽  
Reference Value ◽  
Operating Conditions ◽  
Covering Surface ◽  
Hydraulic Machinery ◽  
Naca0012 Airfoil ◽  
Prone Area ◽  
Simulation Results

In order to suppress the cavitation of an airfoil under random operating conditions, a deformable covering was constructed in the cavitation prone area of the NACA0012 airfoil. By sensing the pressure difference between the inner and outer sides of the airfoil, the covering of the airfoil can be changed adaptively to meet the requirement of suppressing random cavitation of the airfoil. The simulation results show that the cavitation influence range of the airfoil with a shape memory alloy covering can be reduced by more than 70%, and the cavitation is well reduced and suppressed. Moreover, the backflow near the wall of the airfoil was reduced under random working conditions. When the maximum bulge deformation of the covering was between 3–6 mm, the airfoil produced a cavitation range only on the covering surface of the airfoil, and there was no cavitation erosion on other parts. This method with locally variable airfoil to suppress cavitation provides a good reference value for other hydraulic machinery to suppress cavitation.

Based on Numerical Simulation Study of Rockburst in Roadway Induced by Fault

2014 ◽  
Vol 962-965 ◽  
pp. 370-374 ◽  
Author(s):  
Jun Wei Shi ◽  
Zhang Liang Chen
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Rock Burst ◽  
Ultimate Strength ◽  
Simulation Study ◽  
Elastic Energy ◽  
Fault Rock ◽  
Coal Roadway ◽  
Simulation Results ◽  
Occurrence Mechanism

According to the huge losses of people’s life and property caused by coal rockburst, we make numberical simulational research on coal deep buried roadway fault rock burst which is based on the related fators about the occurrence of fault rockburst. Simulation results show that,the stress in fault is the most significant,and with its continuously accumulation ,if it is up to the ultimate strength of coal and rock mass,which will occurre rib spalling, and even it will bring the accumulated elastic energy out ,then induced by fault rockburst. So simulation results are of guiding significance to the occurrence mechanism and predict of coal roadway fault rockburst.

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