Finite element modeling of flow in a coal seam with underground coal gasification cavities

1988 ◽  
Vol 98 (1-2) ◽  
pp. 1-9 ◽  
Author(s):  
Dinshaw N. Contractor
Keyword(s):  
Finite Element ◽  
Coal Seam ◽  
Finite Element Modeling ◽  
Coal Gasification ◽  
Underground Coal Gasification ◽  
Element Modeling

Finite Element Analysis of the Subsidence of Cap Rocks during Underground Coal Gasification Process

2013 ◽  
Vol 859 ◽  
pp. 91-94
Author(s):  
Xiao Xiong Zha ◽  
Hai Yang Wang ◽  
Shan Shan Cheng
Keyword(s):  
Finite Element ◽  
Coal Seam ◽  
Coal Gasification ◽  
Feasibility Studies ◽  
Element Model ◽  
Numerical Results ◽  
Surface Subsidence ◽  
Underground Coal Gasification ◽  
Element Analysis ◽  
Gasification Process

This paper discusses the possible surface subsidence and deformation of the overlying rock during the underground coal gasification (UCG) process, which is an important part of feasibility studies for UCG operations. First coal seam roof movement and surface subsidence in the shallow UCG process were simulated by a finite element model coupled with heat transfer module in COMSOL. Numerical results from this model were compared with and in good agreement to the existing studies. This was followed by the development of model for deeper coal seam cases. The comparison of the numerical results from two models shows that surface uneven settlement in deep underground coal gasification is only 7% of that in shallow underground coal gasification.

Exact First Order Finite Element Modeling for Eddy Current NDE

1991 ◽  
Vol 3 (1) ◽  
pp. 235-253 ◽  
Author(s):  
L. D. Philipp ◽  
Q. H. Nguyen ◽  
D. D. Derkacht ◽  
D. J. Lynch ◽  
A. Mahmood
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Eddy Current ◽  
Element Modeling ◽  
First Order ◽  
Eddy Current Nde

Tire Vibration Modes and Effects on Vehicle Ride Quality

1993 ◽  
Vol 21 (1) ◽  
pp. 23-39 ◽  
Author(s):  
R. W. Scavuzzo ◽  
T. R. Richards ◽  
L. T. Charek
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Operating Conditions ◽  
Modal Testing ◽  
Ride Quality ◽  
Vibration Modes ◽  
Inflation Pressure ◽  
Passenger Cars ◽  
Element Modeling ◽  
Road Surfaces

Abstract Tire vibration modes are known to play a key role in vehicle ride, for applications ranging from passenger cars to earthmover equipment. Inputs to the tire such as discrete impacts (harshness), rough road surfaces, tire nonuniformities, and tread patterns can potentially excite tire vibration modes. Many parameters affect the frequency of tire vibration modes: tire size, tire construction, inflation pressure, and operating conditions such as speed, load, and temperature. This paper discusses the influence of these parameters on tire vibration modes and describes how these tire modes influence vehicle ride quality. Results from both finite element modeling and modal testing are discussed.

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