Abstract: Numerical Modeling of Secondary Oil Migration: Definition of Oil Pathways in Laboratory Scale

AAPG Bulletin ◽  
1998 ◽  
Vol 82 (1998) ◽  
Author(s):  
Souto Filho, João de Deus
Keyword(s):  
Numerical Modeling ◽  
Laboratory Scale ◽  
Oil Migration ◽  
Definition Of

Understanding the expected performance of large-scale solar ponds from laboratory-scale observations and numerical modeling

2014 ◽  
Vol 117 ◽  
pp. 1-10 ◽  
Author(s):  
Francisco Suárez ◽  
Jeffrey A. Ruskowitz ◽  
Amy E. Childress ◽  
Scott W. Tyler
Keyword(s):  
Numerical Modeling ◽  
Large Scale ◽  
Laboratory Scale ◽  
Solar Ponds ◽  
Expected Performance

Numerical Modeling of Pit Growth in Microstructure

2013 ◽  
Author(s):  
Virginia G. DeGiorgi ◽  
Nithyanand Kota ◽  
Alexis C. Lewis ◽  
Siddiq M. Qidwai
Keyword(s):  
Numerical Modeling ◽  
Corrosion Potential ◽  
Element Model ◽  
Arbitrary Lagrangian Eulerian ◽  
Front Speed ◽  
Orientation Image Microscopy ◽  
The Matrix ◽  
Definition Of ◽  
The Finite Element Model ◽  
Grid Based

This work presents the numerical modeling of two-dimensional stable corrosion pit growth by solving the Laplace equation which defines the electric potential within the electrolyte. Microstructural features representative of a 316 stainless steel provides the matrix in which the pit grows. Real microstructural features are incorporated into the computational model. The objective is to determine the influence of the microstructure, specifically crystallographic orientation, on the shape of the pit as it grows over time. The high-resolution definition of the microstructure is obtained by the orientation image microscopy (OIM) technique and is incorporated into the finite element model through a grid-based interpolation functionality. The steel-electrolyte corrosion front movement is simulated with the help of the arbitrary Lagrangian-Eulerian (ALE) meshing technique. The front speed, or the material dissolution rate, is approximated with the use of a Butler-Volmer relationship that relates the dissolution current density to the applied overpotential. The results show that small fluctuations (5–10%) in corrosion potential due to the changing crystal orientation ahead of the corrosion front result in variations in pit shape similar to experimental observations reported in the literature.

scholarly journals Numerical modeling for the urban drainage gallery systems design

RBRH ◽  
2019 ◽  
Vol 24 ◽  
Author(s):  
José Carlos Bohnenberger ◽  
Kleos Magalhães Lenz Cesar Júnior ◽  
Maria Lúcia Calijuri
Keyword(s):  
Numerical Modeling ◽  
Systems Design ◽  
Urban Drainage ◽  
Urban Centers ◽  
Positive Effects ◽  
Recursive Solution ◽  
Correct Definition ◽  
Gallery System ◽  
Accuracy Of Results ◽  
Definition Of

ABSTRACT Considering the frequent flooding of urban centers, the financial limitations and the inefficient management of Urban Drainage (UD) systems in Brazilian municipalities, it is necessary that projects be developed efficiently. These objectives are achieved with the correct definition of the diameter and galleries slope, resulting in adequate hydraulic ratios. It is also necessary to guarantee the flow without backwater, by verifying the energy grade line along the network. There are software capable of assisting the calculation, which, however, do not report optimized solutions. A vector-based numerical modeling is presented for the optimized sizing of a UD gallery system. This model was applied in an area and its results were compared with those obtained by two software in the Brazilian market. It is demonstrated the optimization developed contributes to increases the efficiency in the design. The main scientific contributions are: to characterize and model the typical design slopes, to obtain the optimum slope combined with the smaller diameter; to explore the potential of the hydraulic ratios above those normally employed, with positive effects on the definition of {D, ig} and the economy in the system; and to implement a recursive solution from a cycle of interdependent information, ensuring accuracy of results.

A modern approach to the design of foreign landing parachute systems

2020 ◽  
Author(s):  
S.Yu. Ploskov
Keyword(s):  
Numerical Modeling ◽  
Vortex Formation ◽  
Experimental Studies ◽  
Modern Approach ◽  
Parachute System ◽  
Parachute Canopy ◽  
Payload Mass ◽  
The Stability ◽  
Definition Of ◽  
Expanded Concept

Landing parachute systems are among the most demanded samples of parachute equipment. The purpose of the study was to find new principles for developing parachutes with increased stability according to the analysis of the results of numerical and experimental studies of canopies of various shapes. The paper proposes to supplement a traditional definition of the stability of a parachute system with the obligatory consideration of the system’s ability to maintain a given trajectory of movement with a neutral canopy, regardless of the change in the payload mass. It is the expanded concept of stability that is taken as the basis of the modern approach to the design of foreign landing parachute systems. The study substantiates the main criteria for choosing the optimal cutting shape for parachute systems of increased stability of various types at the stage of preliminary design. The results of numerical modeling of canopies are presented: quarter-spherical, hemispherical, polyconic canopies and a T-11 type parachute canopy. Based on the analysis of these results, the study was first to propose a hypothesis that a decrease in the intensity of vortex formation in the wake leads to an increase in the stability of the parachute descent. The results of numerical modeling of canopies of various shapes, as well as experimental studies of a model polyconic parachute, which prove the correctness of the proposed hypothesis, are presented.

Hurricanes and Tropical Meteorology1

1978 ◽  
Vol 59 (7) ◽  
pp. 790-803 ◽  
Author(s):  
David R. Rodenhuis ◽  
Richard A. Anthes
Keyword(s):  
Numerical Modeling ◽  
Tropical Cyclones ◽  
Observational Studies ◽  
Large Scale ◽  
Field Experiments ◽  
Tropical Meteorology ◽  
Reasonable Accuracy ◽  
Easterly Waves ◽  
Definition Of ◽  
Adequate Measurement

A few examples of scientific accomplishments in tropical meteorology and hurricane research are presented. Tropical field experiments such as GATE have greatly influenced observational studies of convection and tropical easterly waves. One application of the study of convection is the attempt to estimate precipitation from satellite platforms. Research in tropical cyclones has further improved the definition of large-scale structure and the environment in which the hurricane grows. Radiation, convection, and air-sea interaction studies are directed at the forcing and possible feedback of the hurricane with its environment. With this improved physical understanding, numerical modeling of hurricanes can now produce position forecasts of reasonable accuracy that are becoming competitive with current statistical-dynamical methods. There is a continuing effort to attempt hurricane modification experiments in conjunction with an adequate measurement program.

Une méthode prédictive non biaisée et géoréférencée d'estimation des dommages résidentiels d'inondation

2003 ◽  
Vol 30 (5) ◽  
pp. 914-922 ◽  
Author(s):  
Michel Leclerc ◽  
Yves Secretan ◽  
Mourad Heniche ◽  
Taha B.M.J Ouarda ◽  
Joëlle Marion
Keyword(s):  
Numerical Modeling ◽  
Flood Risk ◽  
Flood Risk Management ◽  
Economical Analysis ◽  
Residual Level ◽  
The Mean ◽  
Rating Curves ◽  
Simulation Results ◽  
Definition Of ◽  
The Cost

Flood risk management for residences requires an economical analysis involving the mean annual damage by floods, taking into account the whole range of probability of floods and the cost of projected fluvial enhancements and measures, taking also into account the residual level of risk. Efficient methods are therefore necessary to estimate these risk values. The proposed approach is of a "distributed" type; it involves numerical modeling for estimating "residential submersion depth", a variable, which explains most of the direct damages to residences. The method relies on an individualized georeferenced definition of each residence. Measured submersion data and the compensations obtained from the huge Saguenay flood in 1996 (Ville de Laterrière) were used to build empirical laws based on submersion. Four distinct relationships were established: residences with or without a basement and valued below or above $50,000 each were assigned a specific relationship. With these relationships, direct residential damages in Laterrière were assessed by using only simulation results at the georeferenced position of sector residences as input. It was then possible to evaluate the total amount of direct home damages in Laterrière.Key words: flood, risk, damage rating curves, Saguenay floods, numerical modeling, predictive model, georeference, geographic information system.

Flows of Liquefied Filtered Tailings: Laboratory-Scale Physical and Numerical Modeling

2019 ◽  
Vol 18 (4) ◽  
pp. 393-404
Author(s):  
John A. Sánchez-Peralta ◽  
Lorena N. Beltrán-Rodríguez ◽  
Mario G. Trujillo-Vela ◽  
Joan M. Larrahondo
Keyword(s):  
Numerical Modeling ◽  
Laboratory Scale

An Inverse Parameter Estimation Method for Building Thermal Analysis

2016 ◽  
Vol 138 (2) ◽  
Author(s):  
A. Moftakhari ◽  
C. Aghanajafi
Keyword(s):  
Thermal Analysis ◽  
Numerical Modeling ◽  
Parameter Estimation ◽  
Estimation Method ◽  
Real Data ◽  
Thermal Parameter ◽  
Thermal Design ◽  
Inverse Algorithm ◽  
Definition Of ◽  
Building Engineering

The aim of this study is to introduce a new solution methodology for thermal parameter estimation in building engineering science. By defining a good numerical modeling, inverse algorithm provides us a chance to enhance design conditions in building thermal analysis. The definition of mathematical governing equations and a good solution method to solve them direct the analysis procedure to find temperature distribution using dynamic coding in the computational field. In fact, inverse algorithm utilizes known data resulted from numerical modeling in order to determine the unknown value of important thermal design properties in building problems. The results obtained from implementation of such algorithms demonstrate the accuracy and precision of this new thermal analysis methodology with those of real data resulted from experiments in building problems.

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