scholarly journals Simulation tool for variably saturated flow with comprehensive geochemical reactions in two- and three-dimensional domains

2011 ◽  
Vol 26 (2) ◽  
pp. 210-218 ◽  
Author(s):  
L. Wissmeier ◽  
D.A. Barry
Keyword(s):  
Three Dimensional ◽  
Simulation Tool ◽  
Saturated Flow ◽  
Geochemical Reactions

Geometric Modeling and Simulation of Mechanical Assemblies With Elastic Components

1994 ◽  
Author(s):  
Yong Fang ◽  
F. W. Liou
Keyword(s):  
Finite Element Method ◽  
Geometric Modeling ◽  
Three Dimensional ◽  
Elastic Behavior ◽  
Elastic Analysis ◽  
Simulation Tool ◽  
Body System ◽  
Mechanical Assembly ◽  
Mechanical Assemblies ◽  
Multi Body

Abstract In this paper, the implementation of a modeling system for the simulation of three dimensional mechanical assemblies with elastic components is presented. A mechanical assembly is modeled as a multi-body system with changing topologies. The elastic behavior can be automatically modeled using finite element method. With this simulation tool, a designer can interactively create an assembly of mechanical components ready for dynamic and elastic analysis. This paper presents a prototype of the modeling system.

1997 Best Paper Award—Education Committee: A Three-Dimensional Turbine Engine Analysis Compressor Code (TEACC) for Steady-State Inlet Distortion

1998 ◽  
Vol 120 (3) ◽  
pp. 422-430 ◽  
Author(s):  
A. Hale ◽  
W. O’Brien
Keyword(s):  
Three Dimensional ◽  
Simulation Tool ◽  
Source Terms ◽  
Turbine Engine ◽  
Streamline Curvature ◽  
Inlet Distortion ◽  
Blade Row ◽  
Practical Design ◽  
Distorted Region ◽  
Computationally Intensive

The direct approach of modeling the flow between all blade passages for each blade row in the compressor is too computationally intensive for practical design and analysis investigations with inlet distortion. Therefore a new simulation tool called the Turbine Engine Analysis Compressor Code (TEACC) has been developed. TEACC solves the compressible, time-dependent, three-dimensional Euler equations modified to include turbomachinery source terms, which represent the effect of the blades. The source terms are calculated for each blade row by the application of a streamline curvature code. TEACC was validated against experimental data from the transonic NASA rotor, Rotor 1B, for a clean inlet and for an inlet distortion produced by a 90-deg, one-per-revolution distortion screen. TEACC revealed that strong swirl produced by the rotor caused the compressor to increase in loading in the direction of rotor rotation through the distorted region and decrease in loading circumferentially away from the distorted region.

Numerical Methods for Tracking Interfaces With Surface Tension in 3-D Mold Filling Processes

2002 ◽  
Author(s):  
Matthew W. Williams ◽  
Doug Kothe ◽  
Deniece Korzekwa ◽  
Phil Tubesing
Keyword(s):  
Surface Tension ◽  
Weber Number ◽  
Three Dimensional ◽  
Surface Force ◽  
Qualitative Behavior ◽  
Force Model ◽  
Simulation Tool ◽  
Software Simulation ◽  
Number Problem ◽  
Asymmetric Top

Gravity-pour casting processes are simulated for both low and high Weber number flows. The validation problems examined are a symmetric side-fill problem and a more complex asymmetric top-fill problem with flow over and obstacle. A recently developed continuum surface force model was implemented within a transient three-dimensional software simulation tool and applied to the low Weber number problem. The resulting simulations are compared with experiments that were conducted in order to validate current and future gravity-pour casting simulations. The simulations are found to capture much of the qualitative behavior of the complex three-dimensional flows.

scholarly journals On the coupled unsaturated–saturated flow process induced by vertical, horizontal, and slant wells in unconfined aquifers

2017 ◽  
Vol 21 (2) ◽  
pp. 1251-1262 ◽  
Author(s):  
Xiuyu Liang ◽  
Hongbin Zhan ◽  
You-Kuan Zhang ◽  
Jin Liu
Keyword(s):  
Unsaturated Zone ◽  
Horizontal Well ◽  
Unsaturated Flow ◽  
Three Dimensional ◽  
Water Volume ◽  
Saturated Flow ◽  
Flow Process ◽  
Pumping Tests ◽  
Screen Length ◽  
Unconfined Aquifers

Abstract. Conventional models of pumping tests in unconfined aquifers often neglect the unsaturated flow process. This study concerns the coupled unsaturated–saturated flow process induced by vertical, horizontal, and slant wells positioned in an unconfined aquifer. A mathematical model is established with special consideration of the coupled unsaturated–saturated flow process and the well orientation. Groundwater flow in the saturated zone is described by a three-dimensional governing equation and a linearized three-dimensional Richards' equation in the unsaturated zone. A solution in the Laplace domain is derived by the Laplace–finite-Fourier-transform and the method of separation of variables, and the semi-analytical solutions are obtained using a numerical inverse Laplace method. The solution is verified by a finite-element numerical model. It is found that the effects of the unsaturated zone on the drawdown of a pumping test exist at any angle of inclination of the pumping well, and this impact is more significant in the case of a horizontal well. The effects of the unsaturated zone on the drawdown are independent of the length of the horizontal well screen. The vertical well leads to the largest water volume drained from the unsaturated zone (W) during the early pumping time, and the effects of the well orientation on W values become insignificant at the later time. The screen length of the horizontal well does not affect W for the whole pumping period. The proposed solutions are useful for the parameter identification of pumping tests with a general well orientation (vertical, horizontal, and slant) in unconfined aquifers affected from above by the unsaturated flow process.

scholarly journals On Coupled Unsaturated-Saturated Flow Process Induced by Vertical, Horizontal and Slant Wells in Unconfined Aquifers

2016 ◽  
Author(s):  
Xiuyu Liang ◽  
Hongbin Zhan ◽  
You-Kuan Zhang ◽  
Jin Liu
Keyword(s):  
Unsaturated Zone ◽  
Horizontal Well ◽  
Unsaturated Flow ◽  
Three Dimensional ◽  
Early Time ◽  
Saturated Flow ◽  
Flow Process ◽  
Pumping Tests ◽  
Screen Length ◽  
Unconfined Aquifers

Abstract. Conventional models of pumping tests in unconfined aquifers often neglect the unsaturated flow process. This study concerns coupled unsaturated-saturated flow process induced by vertical, horizontal, and slant wells positioned in an unconfined aquifer. A mathematical model is established with special consideration of the coupled unsaturated-saturated flow process and well orientation. Groundwater flow in the saturated zone is described by a three-dimensional governing equation, and a linearized three-dimensional Richards' equation in the unsaturated zone. A solution in Laplace domain is derived by the Laplace-finite Fourier transform and the method of separation of variables. It is found that the unsaturated zone has significant effects on the drawdown of pumping test with any angle of inclination of the pumping well, and this impact is more significant for the case of a horizontal well. The effects of unsaturated zone on the drawdown are independent of the length of the horizontal well screen. For the early time of pumping, the water volume drained from the unsaturated zone (W) increases with time, and gradually approaches an asymptotic value with time progress. The vertical well leads to the largest W value during the early time, and the effects of the well orientation become insignificant at the later time. The screen length of the horizontal well does not affect W for the whole pumping period. The proposed solutions are useful for parameter identification of pumping tests with a general well orientation (vertical, horizontal, and slant) in unconfined aquifers affected from above by the unsaturated flow process.

scholarly journals 3D CFD Arc Fault Simulation in Gas-Insulated Switchgears

2019 ◽  
Vol 6 (1) ◽  
pp. 35-38
Author(s):  
F. Reichert ◽  
A. Petchanka
Keyword(s):  
Simulation Model ◽  
Development Process ◽  
Fault Simulation ◽  
Three Dimensional ◽  
Modelling And Simulation ◽  
Simulation Tool ◽  
Arc Voltage ◽  
Arc Model ◽  
Rupture Disc ◽  
Protection Systems

Arc fault processes can lead to strong damages in gas-insulated switchgears and have to be considered in the development process. In order to reduce test costs, the development of overpressure protection systems can be supported by CFD arc fault simulations. The paper deals with the modelling and simulation of arc fault processes in gas--insulated switchgears. The developed simulation tool takes into account a three-dimensional arc model and the opening of a rupture disc during the arc fault process. The influence of different insulating media as e.g. SF<sub>6</sub>, Air and CO<sub>2</sub> on the arc fault process has been investigated. The simulation model has been validated by measured signals for pressure build-up and arc voltage.

A generalized Ross method for two- and three-dimensional variably saturated flow

2013 ◽  
Vol 54 ◽  
pp. 67-77 ◽  
Author(s):  
Yuanyuan Zha ◽  
Liangsheng Shi ◽  
Ming Ye ◽  
Jinzhong Yang
Keyword(s):  
Three Dimensional ◽  
Saturated Flow
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