scholarly journals Numerical simulation of particulate suspension transport and permeability impairment in an actual rough fracture under normal stresses

2020 ◽  
Vol 8 (4) ◽  
pp. 1165-1180 ◽  
Author(s):  
Baiyu Zhu ◽  
Hongming Tang ◽  
Feng Zhao ◽  
Haoxuan Tang
Keyword(s):  
Numerical Simulation ◽  
Normal Stresses ◽  
Rough Fracture ◽  
Particulate Suspension ◽  
Permeability Impairment

scholarly journals FORMATION DAMAGE MECHANISMS AND NUMERICAL SIMULATION OF PERMEABILITY IMPAIRMENT IN HORIZONTAL WELLS

2021 ◽  
Vol 15 (2) ◽  
pp. 184-204
Author(s):  
Tunde Adeosun ◽  
Moruffdeen Adabanija ◽  
Folake Akinpelu
Keyword(s):  
Numerical Simulation ◽  
Linear Partial Differential Equation ◽  
Horizontal Wells ◽  
Numerical Approach ◽  
Formation Damage ◽  
Well Performance ◽  
Damage Mechanisms ◽  
Pressure Losses ◽  
Permeability Impairment ◽  
The Impact

Puzzling circumstance associated with formation damage near wellbore occur frequently, resulting in permeability impairments and increased pressure losses. Potential damage phenomenon usually starts from drilling to completion via production and such mechanisms have been fully considered. Most of the existing tasks to mitigate the near oil wellbore damages involve use of empirical models, conducting experiments, frequent shut down of wells for proper well tests and pressure maintenance are highly expensive and time consuming. Permeability impairments have been simulated by modifying Darcy’s equation to optimize reservoir pressure for improved near wellbore in horizontal wells. The model, transient linear partial differential equation (TLPDE) for impaired permeability is developed and numerically resolved using finite difference method. The model was implemented by writing codes in MATLAB language and the solution obtained was validated using synthetic/ field data. The results obtained for TLPDE model indicated pressure depletion over time. This was also shown for every values of coefficient of anisotropy until 400 days when the anisotropy became insignificant approaching isotropy condition, suggesting permeability impairment. Numerical simulation proved to be effective in simulating near oil wellbore damages. This paper describes the detailed mechanisms of formation damage and provided a numerical approach to model impaired permeability in horizontal wells. This approach allowed us to study the impact of various damage mechanisms related to drilling, completion conditions and significant improvement of near oil wellbore for well performance.

scholarly journals Direct numerical simulation of a wall jet: flow physics

2018 ◽  
Vol 852 ◽  
pp. 507-542 ◽  
Author(s):  
Iftekhar Z. Naqavi ◽  
James C. Tyacke ◽  
Paul G. Tucker
Keyword(s):  
Numerical Simulation ◽  
Reynolds Number ◽  
Shear Stress ◽  
Direct Numerical Simulation ◽  
Outer Layer ◽  
Turbulent Diffusion ◽  
Reynolds Shear Stress ◽  
Wall Jet ◽  
Normal Stresses ◽  
Mean Flow

A direct numerical simulation (DNS) of a plane wall jet is performed at a Reynolds number of $Re_{j}=7500$. The streamwise length of the domain is long enough to achieve self-similarity for the mean flow and the Reynolds shear stress. This is the highest Reynolds number wall jet DNS for a large domain achieved to date. The high resolution simulation reveals the unsteady flow field in great detail and shows the transition process in the outer shear layer and inner boundary layer. Mean flow parameters of maximum velocity decay, wall shear stress, friction coefficient and jet spreading rate are consistent with several other studies reported in the literature. Mean flow, Reynolds normal and shear stress profiles are presented with various scalings, revealing the self-similar behaviour of the wall jet. The Reynolds normal stresses do not show complete similarity for the given Reynolds number and domain length. Previously published inner layer budgets based on LES are inaccurate and those that have been measured are only available in the outer layer. The current DNS provides fully balanced, explicitly calculated budgets for the turbulence kinetic energy, Reynolds normal stresses and Reynolds shear stress in both the inner and outer layers. The budgets are scaled with inner and outer variables. The inner-scaled budgets in the near wall region show great similarity with turbulent boundary layers. The only remarkable difference is for the turbulent diffusion in the wall-normal Reynolds stress and Reynolds shear stress budgets. The outer layer interacts with the inner layer through turbulent diffusion and the excess energy from the wall-normal direction is transferred to the spanwise direction.

Numerical Simulation of a 2D Layered Anode for use in Lithium-Ion Batteries

2021 ◽  
pp. 2150032
Author(s):  
Alexander Galashev
Keyword(s):  
Numerical Simulation ◽  
Numerical Methods ◽  
Lithium Ion Batteries ◽  
Electronic States ◽  
Lithium Ion ◽  
Graphite Substrate ◽  
Technological Problem ◽  
Two Dimensional ◽  
Normal Stresses ◽  
Electrically Conductive

An important technological problem is solved by numerical methods. Doping of silicene with phosphorus allows changing the morphology of the walls of the silicene channel without reducing their strength. The structure of lithium packings in the channels is studied in detail. The distribution of normal stresses in the walls of the channel before lithium intercalation and after complete lithium filling is determined. The calculated densities of electronic states allow us to conclude that both doped and undoped silicene on a graphite substrate become electrically conductive. The studied two-dimensional silicene can be used as an anode for next-generation lithium-ion batteries.

scholarly journals Numerical Modeling of Tribological Characteristics of Fibrous Polymer Composite Materials

2021 ◽  
pp. 198-206
Author(s):  
Denis D. Palkin ◽  
Andrey A. Chekalkin
Keyword(s):  
Numerical Simulation ◽  
Composite Materials ◽  
Polymer Composite ◽  
Local Approximation ◽  
Polymer Composite Materials ◽  
Normal Stresses ◽  
The Coefficient Of Friction ◽  
Fibrous Polymer ◽  
Fibrous Polymer Composite ◽  
Mechanics Of Composite Materials

The paper presents a numerical simulation of the contact interaction of fibrous polymer composite materials in a finite element ANSYS package and studies the friction coefficients for cells with wear of 0%, 25%, 50% and 75%. To predict the coefficient of friction of composites it was proposed to use the method of mechanics of composite materials – the method of local approximation. With the help of numerical simulation, the fields of distribution of normal stresses and contact stresses in the contact zone were obtained and the corresponding conclusions were drawn

Water uptake by substituted amylose tablets: experimentation and numerical simulation

2009 ◽  
Vol 00 (00) ◽  
pp. 090904073309027-8
Author(s):  
H.W. Wang ◽  
S. Kyriacos ◽  
L. Cartilier
Keyword(s):  
Numerical Simulation ◽  
Water Uptake
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