Numerical analysis of heat and moisture transport with a finite difference method

2012 ◽  
Vol 29 (1) ◽  
pp. 226-250 ◽  
Author(s):  
Buyang Li ◽  
Weiwei Sun
Keyword(s):  
Numerical Analysis ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Moisture Transport ◽  
Heat And Moisture Transport ◽  
Heat And Moisture

A Co-Simulation Scalar-Potential Finite Difference Method for the Numerical Analysis of Human Exposure to Magneto-Quasi-Static Fields

2017 ◽  
Vol 53 (6) ◽  
pp. 1-4 ◽  
Author(s):  
Martin Zang ◽  
Carsten Cimala ◽  
Markus Clemens ◽  
Jennifer Dutine ◽  
Thomas Timm ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Human Exposure ◽  
Scalar Potential

Finite Difference Numerical Analysis and Experimental Measurements for Beam Profiles of Ultrasonic Creeping Wave Probe

2011 ◽  
Vol 52-54 ◽  
pp. 1074-1079
Author(s):  
Chao Lu ◽  
Ming Fang Zheng
Keyword(s):  
Numerical Analysis ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Mechanical Energy ◽  
Ultrasonic Transducer ◽  
Coarse Grained ◽  
Main Beam ◽  
Angle Of Incidence ◽  
Creeping Wave

Compare with the Rayleigh wave method, ultrasonic creeping waves critically technique for surface and subsurface defects nondestructive measurement for has the prominent advantage, which not sensitive to surface roughness in coarse-grained materials such as austenitic steel, In this paper, the propagation characteristics and beam profiles of the creeping probe were investigated using finite difference method and measured experimentally. The finite difference numerical model for reflection arc part of the IIW block was established. Through the numerical analysis, wavefront snapshots of the creeping wave propagated in the IIW block are very clear to illustrate the mechanism, and the directivity characteristic of the main beam is obtained. The creeping wave sound characteristics were observed using the dynamical photoelastic experimental method. The beam profiles of the creeping wave probe was measured on the IIW block, the experimental measurement results and the numerical analysis are in good agreement. The results are really significant to design an efficient producer for the surface and sub-surface defects detection based on the ultrasonic creeping wave method.In this paper, a numerical modeling of contact conical transducers is discussed in conjunction with wave propagation analyses by a finite difference method (FDM). Although transducers are the devices to convert electrical energy into mechanical energy and vice versa, attention in this paper is paid mostly to the study of characteristics and parameters of cones and wedges influencing their performance. Cones and wedges inserted between an ultrasonic transducer and the specimen provide the transducer with enhanced capability for point or line contact with the specimen. We study the effect of the dimensions, shape and aperture on the frequency response and the angle of incidence of the wave. Through the testing transducer modeling, some conclusions have been drawn from the analysis, which is useful to as the guideline and criteria for an optimum conical wedge design.

scholarly journals A Leap-Frog Finite Difference Method for Strongly Coupled System from Sweat Transport in Porous Textile Media

2019 ◽  
Vol 2019 ◽  
pp. 1-16
Author(s):  
Qian Zhang ◽  
Chao Huang
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Moisture Transfer ◽  
Coupled System ◽  
Optimal Error Estimates ◽  
Strongly Coupled ◽  
Physical Mechanisms ◽  
Uniqueness Of The Solution ◽  
Heat And Moisture

In this paper, we present an uncoupled leap-frog finite difference method for the system of equations arising from sweat transport through porous textile media. Based on physical mechanisms, the sweat transport can be viewed as the multicomponent flow that coupled the heat and moisture transfer, such that the system is nonlinear and strongly coupled. The leap-frog method is proposed to solve this system, with the second order accuracy in both spatial and temporal directions. We prove the existence and uniqueness of the solution to the system with optimal error estimates in the discrete L2 norm. Numerical simulations are presented and analyzed, respectively.

Numerical Analysis of Stabilization of Slopes Overlying Bedrock Using Piles and Effect of Socketed Length of Pile on Stability

2014 ◽  
Vol 580-583 ◽  
pp. 424-431 ◽  
Author(s):  
Mudthir Bakri ◽  
Yuan You Xia ◽  
Hua Bing Wang
Keyword(s):  
Numerical Analysis ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Shear Force ◽  
Factor Of Safety ◽  
Bending Moment ◽  
Computer Code

Piles are used widely for stabilization of landslides. To stabilize a slope settled on bedrock with piles the required factor of safety must be checked, and pile should be designed properly. Piles should be socketed into firm rock to prevent uprooting or overturning .In this research it is aimed to look into the socketed length of pile in bedrock. Therefore the parameters that affect the factor of safety of slope/pile system such as location, length, spacing and diameter of piles are analyzed. The effect of socketed length of pile in rock on pile behavior is investigated by plotting the shear force and bending moment diagrams along pile. The optimal pile position is found to be located slightly upper of the middle of the slope. The minimum socketed length after which the factor of safety will be remained constant is found to be 0.12L where L is pile length.FLAC3D computer code based on finite difference method is used to simulate the slope/pile system.

Pseudo-Nine-Point Finite Difference Method for Numerical Analysis of Lubrication

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Shaoxian Bai ◽  
Xudong Peng ◽  
Yonggang Meng ◽  
Shizhu Wen
Keyword(s):  
Numerical Analysis ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Surface Texture ◽  
Difference Method ◽  
New Method ◽  
Pressure Distributions ◽  
Different Types ◽  
Mesh Density ◽  
Analysis Error

Contours of surface texture of contact faces are not always parallel to the directions of the axis in solving Reynolds equations with finite difference method, and this often induces significant pressure saw-tooth effect, which results in an unignored analysis error. In this paper, pseudo-nine-point finite difference, as a new finite difference method, is introduced to solve the lubrication numerical problem of pressure saw-tooth. Also, application is carried out in gas lubrication of hard disk systems to verify the validity of the new method. In analysis, pressure distributions and gas floating forces are calculated for two different types of sliders, and the astringency and efficiency of the new method is discussed. Numerical results show that the pseudo-nine-point finite difference method can restrain pressure saw-tooth evidently, and presents better astringency and efficiency than the traditional five-point finite difference method. With the increase in mesh density, pressure distribution and gas floating force trend to steady. Also, numerical values of the floating force agree well with the experimental ones.

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