scholarly journals A Hierarchical Grid Solver for Simulation of Flows of Complex Fluids

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3168
Author(s):  
Antonio Castelo ◽  
Alexandre M. Afonso ◽  
Wesley De Souza Bezerra
Keyword(s):  
Fluid Flow ◽  
Finite Differences ◽  
Complex Fluids ◽  
Moving Least Squares ◽  
Order Of Accuracy ◽  
New Approach ◽  
Flow Simulations ◽  
Numerical Tests ◽  
Main Challenge ◽  
Interpolation Technique

Tree-based grids bring the advantage of using fast Cartesian discretizations, such as finite differences, and the flexibility and accuracy of local mesh refinement. The main challenge is how to adapt the discretization stencil near the interfaces between grid elements of different sizes, which is usually solved by local high-order geometrical interpolations. Most methods usually avoid this by limiting the mesh configuration (usually to graded quadtree/octree grids), reducing the number of cases to be treated locally. In this work, we employ a moving least squares meshless interpolation technique, allowing for more complex mesh configurations, still keeping the overall order of accuracy. This technique was implemented in the HiG-Flow code to simulate Newtonian, generalized Newtonian and viscoelastic fluids flows. Numerical tests and application to viscoelastic fluid flow simulations were performed to illustrate the flexibility and robustness of this new approach.

An Integrated Model for Computer Aided Reservoir Description : from Outcrop Study to Fluid Flow Simulations

1990 ◽  
Vol 45 (1) ◽  
pp. 71-77 ◽  
Author(s):  
D. Guerillot ◽  
J. L. Rudkiewicz ◽  
C. Ravenne ◽  
G. Renard ◽  
A. Galli
Keyword(s):  
Fluid Flow ◽  
Integrated Model ◽  
Flow Simulations ◽  
Computer Aided ◽  
Reservoir Description

New Approach to the Suction Force at the Leading Edge of a Profile With Zero Thickness

2004 ◽  
Vol 48 (04) ◽  
pp. 305-310
Author(s):  
J. A. Sparenberg ◽  
E. M. de Jager
Keyword(s):  
Fluid Flow ◽  
Linear Theory ◽  
Leading Edge ◽  
Delta Function ◽  
Inviscid Fluid ◽  
Suction Force ◽  
New Approach ◽  
Nonzero Mean

This paper considers the suction force at the leading edge of a profile with zero thickness in an incompressible and inviscid fluid flow. The theory is linear, and the approach to the suction force is from the innerside of the profile. It is shown that the suction force can be considered as an "integral" over a delta function of Dirac situated at the nose of the profile. An application of the method is given to show that in the linear theory a nonslotted periodically moving profile that does not shed free vorticity cannot yield a nonzero mean thrust.

scholarly journals Quantifying flow in variably wet microporous carbonates using object-based geological modeling and both lattice-Boltzmann and pore-network fluid flow simulations

AAPG Bulletin ◽  
2015 ◽  
Vol 99 (10) ◽  
pp. 1827-1860 ◽  
Author(s):  
S.R. Harland ◽  
R.A. Wood ◽  
A. Curtis ◽  
M.I.J. van Dijke ◽  
K. Stratford ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Lattice Boltzmann ◽  
Pore Network ◽  
Geological Modeling ◽  
Flow Simulations ◽  
Object Based

Fluvial architecture of the Burro Canyon Formation using unmanned aerial vehicle-based photogrammetry and outcrop-based modeling: Implications for reservoir performance, Escalante Canyon, southwestern Piceance Basin, Colorado

2018 ◽  
Vol 6 (4) ◽  
pp. T1117-T1139
Author(s):  
Sarah A. Clark ◽  
Matthew J. Pranter ◽  
Rex D. Cole ◽  
Zulfiquar A. Reza
Keyword(s):  
Fluid Flow ◽  
Unmanned Aerial Vehicle ◽  
Geometric Mean ◽  
Piceance Basin ◽  
Sweep Efficiency ◽  
Flow Simulations ◽  
Reservoir Performance ◽  
Reservoir Models ◽  
Sandstone Body ◽  
Aerial Vehicle

The Cretaceous Burro Canyon Formation in the southern Piceance Basin, Colorado, represents low sinuosity to sinuous braided fluvial deposits that consist of amalgamated channel complexes, amalgamated and isolated fluvial-bar channel fills, and floodplain deposits. Lithofacies primarily include granule-cobble conglomerates, conglomeratic sandstones, cross-stratified sandstones, upward-fining sandstones, and gray-green mudstones. To assess the effects of variable sandstone-body geometry and internal lithofacies and petrophysical heterogeneity on reservoir performance, conventional field methods are combined with unmanned aerial vehicle-based photogrammetry to create representative outcrop-based reservoir models. Outcrop reservoir models and fluid-flow simulations compare three reservoir scenarios of the Burro Canyon Formation based on stratigraphic variability, sandstone-body geometry, and lithofacies heterogeneity. Simulation results indicate that lithofacies variability can account for an almost 50% variation in breakthrough time (BTT). Internal channel-bounding surfaces reduce the BTT by 2%, volumetric sweep efficiency by 8%, and recovery efficiency by 10%. Three lateral grid resolutions and two permeability-upscaling methods for each reservoir scenario are explored in fluid-flow simulations to investigate how upscaling impacts reservoir performance. Our results indicate that coarsely resolved grids experience delayed breakthrough by as much as 40% and greater volumetric sweep efficiency by an average of 10%. Permeability models that are upscaled using a geometric mean preserve slightly higher values than those using a harmonic mean. For upscaling based on a geometric mean, BTTs are delayed by an average of 17% and the volumetric sweep efficiency is reduced by as much as 10%. Results of the study highlight the importance of properly incorporating stratigraphic details into 3D reservoir models and preserving those details through proper upscaling methods.

scholarly journals ANALYSIS OF THE GLOBAL AND LOCAL IMPERFECTION OF STRUCTURAL MEMBERS AND FRAMES

2019 ◽  
Vol 25 (8) ◽  
pp. 805-818 ◽  
Author(s):  
Charlotte Mercier ◽  
Abdelouahab Khelil ◽  
Ali Khamisi ◽  
Firas Al Mahmoud ◽  
Rémi Boissiere ◽  
...  
Keyword(s):  
Second Order ◽  
Structural Defects ◽  
Order Effects ◽  
Structural Members ◽  
Buckling Mode ◽  
New Approach ◽  
Order Analysis ◽  
Main Challenge ◽  
Buckling Failure ◽  
Global And Local

Stresses of a structure are determined with a first or a second order analysis. The choice of the method is guided by the potential influence of the structure’s deformation. In general, considering their low rigidity with regard to those of buildings, scaffolding and shoring structures quickly reach buckling failure. Imperfections, such as structural defects or residual stresses, generate significant second order effects which have to be taken into account. The main challenge is to define these imperfections and to include them appropriately in the calculations. The present study suggests a new approach to define all the structure’s imperfections as a unique imperfection, based on the shape of elastic critical buckling mode of the structure. This study proposes a method allowing to determine the equation of the elastic critical buckling mode from the eigenvectors of the second order analysis of the structure. Subsequently, a comparative study of bending moments of different structures calculated according to current Eurocode 3 or 9 methods or according to the new method is performed. The obtained results prove the performance of the proposed method.

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