scholarly journals A Study of Architecture of Thin Interlayer within Meandering River Monosandbody of Thick-Bedded Oil Layers

2017 ◽  
Vol 9 (3) ◽  
pp. 16
Author(s):  
Jingfu Shan ◽  
Zhipeng Lin ◽  
Le Chen ◽  
Bo Liu ◽  
Wei Fang ◽  
...  
Keyword(s):  
Fluid Motion ◽  
Three Dimensional ◽  
Parameter Extraction ◽  
Point Of View ◽  
Three Dimensions ◽  
Meandering River ◽  
Reservoir Architecture ◽  
Abandoned Channel ◽  
Equal Importance ◽  
Thin Interlayer

This paper investigates the reservoir architecture of thin interlayer within meandering river monosandbody in the thick-bedded oil layers. The thin interlayer within the monosandbody of the terrestrial reservoir is one of the dominant factors which form the reservoir heterogeneity of fluid motion. It is of equal importance in comparison with the rhythmic distribution of permeability, and it is also the important content of the elaborate representation of reservoirs. However, previous researches of the heterogeneity of reservoir focus mostly on the theory of distribution disparity of the permeability and neglect the influence of thin interlayer on the heterogeneity. Therefore, taking the PⅠ2 individual reservoir at the Putaohua reservoir formation in Daqing oilfield as an example, this paper analyzes the distribution, formation, and the three-dimensional construction of the internal thin interlayer of the monosandbody from a new point of view, on the basis of which a set of cycle research technique about it is put forward. With the method of configuration parameter extraction, which is most important before establishing interlayer configuration in three dimensions, this study clarifies the classification, causes of formation and the differences of distinct monosandbodies. Ultimately, four categories of thin interlayer according to the characteristics of the studied area is divided and two dominate causes for thin interlayer formation is discussed: argillaceous and arenaceous rock interlayer through deposition and interlayer in process of sedimentary diagenesis.For the convenience of the study, here mainly focuses on the thick - thin interlayer. Techniques are taken the use of determining the obliquity of the thin interlayer superface based on the configuration of paired wells and abandoned channel surface. The causes for thin interlayer and their classification, distribution and the three-dimensional construction are entirely revealed, which would possess important geologic meaning for taking affective engineering measures in the aspects of the elaborate representation of oil reservoir, and the research of remaining oil formation and distribution.

scholarly journals Oscillatory and steady streaming flow in the anterior chamber of the moving eye

2019 ◽  
Vol 863 ◽  
pp. 904-926 ◽  
Author(s):  
M. Dvoriashyna ◽  
R. Repetto ◽  
J. H. Tweedy
Keyword(s):  
Anterior Chamber ◽  
Fluid Motion ◽  
Three Dimensional ◽  
Frequency Component ◽  
Dominant Frequency ◽  
Point Of View ◽  
Dimensional Structure ◽  
Steady Streaming ◽  
Constant Height ◽  
Angular Amplitude

We study the flow induced by eye rotations in the anterior chamber (AC) of the eye, the region between the cornea and the iris. We model the geometry of the AC as a thin domain sitting on the surface of a sphere, and study both the simpler case of a constant-height domain as well as a more realistic AC shape. We model eye rotations as harmonic in time with prescribed frequency $\unicode[STIX]{x1D714}_{f}$ and amplitude $\unicode[STIX]{x1D6FD}$, and use lubrication theory to simplify the governing equations. We write the equations in a reference frame moving with the domain and show that fluid motion is governed by three dimensionless parameters: the aspect ratio $\unicode[STIX]{x1D716}$ of the AC, the angular amplitude $\unicode[STIX]{x1D6FD}$ and the Womersley number $\unicode[STIX]{x1D6FC}$. We simplify the equations under the physiologically realistic assumptions that $\unicode[STIX]{x1D716}$ is small and $\unicode[STIX]{x1D6FC}$ large, leading to a linear system that can be decomposed into three harmonics: a dominant frequency component, with frequency $\unicode[STIX]{x1D714}_{f}$, and a steady streaming component and a third component with frequency $2\unicode[STIX]{x1D714}_{f}$. We solve the problem analytically for the constant-height domain and numerically as the solution of ordinary differential equations in the more realistic geometry. Both the primary flow and the steady streaming are shown to have a highly three-dimensional structure, which has not been highlighted in previous numerical works. We show that the steady streaming is particularly relevant from the clinical point of view, as it induces fluid mixing in the AC. Furthermore, the steady flow component is the dominant mixing mechanism during the night, when the thermal flow induced by temperature variations across the AC is suppressed.

scholarly journals Coherent structures and chaotic advection in three dimensions

2010 ◽  
Vol 654 ◽  
pp. 1-4 ◽  
Author(s):  
STEPHEN WIGGINS
Keyword(s):  
Dynamical Systems ◽  
Fluid Mechanics ◽  
Coherent Structures ◽  
Three Dimensional ◽  
Point Of View ◽  
Three Dimensions ◽  
Chaotic Advection ◽  
Periodic Flow ◽  
Two Dimensional ◽  
Time Periodic

In the 1980s the incorporation of ideas from dynamical systems theory into theoretical fluid mechanics, reinforced by elegant experiments, fundamentally changed the way in which we view and analyse Lagrangian transport. The majority of work along these lines was restricted to two-dimensional flows and the generalization of the dynamical systems point of view to fully three-dimensional flows has seen less progress. This situation may now change with the work of Pouransari et al. (J. Fluid Mech., this issue, vol. 654, 2010, pp. 5–34) who study transport in a three-dimensional time-periodic flow and show that completely new types of dynamical systems structures and consequently, coherent structures, form a geometrical template governing transport.

scholarly journals CONFORMAL MODELS OF MAGNETOHYDRODYNAMIC TURBULENCE

1996 ◽  
Vol 11 (29) ◽  
pp. 5261-5277 ◽  
Author(s):  
OMDUTH COCEAL ◽  
STEVEN THOMAS
Keyword(s):  
Three Dimensional ◽  
Approximate Solutions ◽  
Velocity Fields ◽  
Point Of View ◽  
Three Dimensions ◽  
Finite Conductivity ◽  
Magnetohydrodynamic Turbulence ◽  
Infinite Conductivity ◽  
Conformal Models

Following the previous work of Ferretti and Yang on the role of magnetic fields in the theory of conformal turbulence, we show that nonunitary minimal model solutions to two-dimensional magnetohydrodynamics (MHD) obtained by dimensional reduction from three dimensions exist under different (and more restrictive) conditions. From a three-dimensional point of view, these conditions are equivalent to perpendicular flow, in which the magnetic and velocity fields are orthogonal. We extend the analysis to the finite conductivity case and present some approximate solutions, whose connection with the exact ones of the infinite conductivity case is also discussed.

A variational principle for three-dimensional interactions between water waves and a floating rigid body with interior fluid motion

2019 ◽  
Vol 866 ◽  
pp. 630-659 ◽  
Author(s):  
Hamid Alemi Ardakani
Keyword(s):  
Variational Principle ◽  
Rigid Body ◽  
Water Waves ◽  
Fluid Motion ◽  
Three Dimensional ◽  
Rigid Body Dynamics ◽  
The Body ◽  
Three Dimensions ◽  
Fluid Sloshing ◽  
Gravity Driven

A variational principle is given for the motion of a rigid body dynamically coupled to its interior fluid sloshing in three-dimensional rotating and translating coordinates. The fluid is assumed to be inviscid and incompressible. The Euler–Poincaré reduction framework of rigid body dynamics is adapted to derive the coupled partial differential equations for the angular momentum and linear momentum of the rigid body and for the motion of the interior fluid relative to the body coordinate system attached to the moving rigid body. The variational principle is extended to the problem of interactions between gravity-driven potential flow water waves and a freely floating rigid body dynamically coupled to its interior fluid motion in three dimensions.

Sub-Diffraction Limit Three Dimensional Particle Tracking Velocimetry

2013 ◽  
Author(s):  
Craig A. Snoeyink ◽  
Gordon Christopher ◽  
Sourav Barman ◽  
Steve Wereley
Keyword(s):  
Imaging System ◽  
Optical Measurement ◽  
Single Point ◽  
Bessel Beam ◽  
Three Dimensional ◽  
Diffraction Limit ◽  
Point Of View ◽  
Three Dimensions ◽  
Three Dimension ◽  
Single View

Here we present an optical measurement technique and image analysis process capable of tracking particles in three dimensions with a single point of view. In addition to single view 3D-PTV, the optical system is capable of tracking individual particles even at particle-particle spacings that are closer then the diffraction limit of the base imaging system. The measurement system, termed Bessel Beam Microscopy (BBM), functions as an attachment for a microscope that fits between the microscope base and camera. The addition of the BBM attachment transforms the point spread function (PSF) of the microscope allowing two unique functions: single image superresolution imaging, and the extraction of three dimension location information of particles without calibration. The result is a fluid characterization tool with unique capabilities for velocimetry and characterization of the dynamics of dense fluid-particle suspensions.

scholarly journals Determining the parameters of the trajectory of the bucket of mining quarries excavators

2021 ◽  
Vol 280 ◽  
pp. 05013
Author(s):  
Valerii Tytiuk ◽  
Kamal Khandakji ◽  
Galina Sivyakova ◽  
Nadezhda Karabut ◽  
Oleksii Chornyi ◽  
...  
Keyword(s):  
Position Control ◽  
Control Method ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Mining Industry ◽  
Point Of View ◽  
Three Dimensions ◽  
Electric Drives ◽  
Coordinate Control ◽  
Electric Excavator

The bucket positioning of the excavator in three-dimensions (3-D) is the precondition of the robotic excavator starting automatized works. The electric excavator is one of the most widely used machinery in the mining industry, mainly due to its versatility and portability. Among the tasks performed by the excavator, there is a significant number of repetitive movements associated with moving the bucket to the unloading point and back to the face. Using automated functions to perform such repetitive tasks will not only significantly increase overall productivity, but also reduce energy consumption. This research is carried out to create a method of coordinate control of electric drives of the boom, dipper stick, and bucket of an electric excavator to perform accurate and efficient work. On the basis of the kinematic analysis of the excavator’s attachment system, the trajectory of the end of the working body can be determined from the point of view of the coordinated movement of the electric drives of the main mechanisms of the excavator. Thus, the complex algorithm of the excavator bucket 3-D position control can be carried out by coordinated control of the movement of three separate electric drives. This coordinate control algorithm was tested on the example of the EKG-8I excavator, and the results of the verification showed that this developed control method can satisfactorily perform the function of automatic control of the bucket position in three-dimensional space. Optimization of control will be further carried out based on the analysis of the energy efficiency of various possible trajectories.

scholarly journals MORPHOMETRY AND LASER SCANNER IMAGING: A REVOLUTION IN ANATOMY

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
G. Gelati ◽  
M. Tanga
Keyword(s):  
Three Dimensional ◽  
Laser Scanner ◽  
Point Of View ◽  
Three Dimensions ◽  
Scientific Models ◽  
Virtual Model ◽  
Visual Spatial ◽  
Anatomical Images ◽  
Dimensional Reconstruction ◽  
Cloud Of Points

Anatomy is a visual science, even if the visual quality of anatomy can be declined in different ways, as we will show. Anatomy holds its own main feature in the etymology of the name itself: it is through cutting (ανά, anà) by lancet (τέμνω, tèmno) that preparations are yet prepared. This operation is aimed to make evident and well visible anatomical structures. Vesalius is the first modern anatomist and his main heuristic principle consists in the equivalence between seeing and knowing. The possibility of analyzing fresh anatomical preparations is made short by the unavoidable decomposition processes of the cadaver. Due to this reason beautiful and precious tables have always been drawn, painted and printed. We remember the ones by the Fisiocritic Paolo Mascagni, whose double centenary of death is celebrated this year. Watercolor tables are yet much realized and used. However they are bi-dimensional schematizations and, even if well done, they remain far from reality. Photography allows to fix the image of anatomical preparations with high fidelity of particulars. However these images are static. The graphic synthesis allows to realize four-dimensional human virtual models. They can be rotated according to the three spatial axes and, thanks to this, they can be observed from every point of view. Due to the fact that these are schematizations, they are very far from reality. For this reason CT three-dimensional reconstruction, that rebuilds anatomy in three dimensions, allows to obtain results with very superior quality and fidelity. However these reproductions lack color and real light. The gap between the iconographic representation and the existing thing is and will always be not fully eliminable. However our use of laser scanner technology allows to reduce this gap to minimal levels, with a quick and easy acquisition process. Laser scanner generates a cloud of points of the examined object. Each point is identified through exact coordinates. Besides, the photos of the same object can be over-placed to the cloud. The result is a virtual model that reconstructs the real object, highly corresponding as in morphology and as in colors. This virtual model allows us to interact and we can rotate it, watch at it from every perspective and especially we can measure it. The scanner we have used allowed us to reach an accuracy of ±25 μm. The anatomical preparation is literally “immortalized”, up to under-millimetric details, where the naked eye is ineffective. The so obtained image allows to re-observe and to measure the object forever. We can imagine a lot of very innovative, if not revolutionary applications. We realized our four-dimensional models aiming to attach them to this project. These scanning are of two skulls and of a heart. They are the concrete proof of the possibility of obtaining surprising results in many areas, from normal anatomy to pathological anatomy, from legal medicine to biology. This way of obtaining anatomical images is marking a turning point from a taxonomic, serial and verbal conception of Anatomy to a visual, spatial and mathematical one. Instead of lists of nominal labels we have now coordinates and quantitative/structural references. This makes Anatomy more treatable through digital methods. The visual approach has far origins: since XIII Century, when real (not formal) Renaissance of figurative arts begins, and during following ages, visual paradigms gain more and more importance in human knowledge. Once more we are dwarves on the shoulders of giants. Besides, detecting morphology by laser scanner pushes us to re-configure the relationship between nomothetic and ideographic approach in building scientific models.

scholarly journals Exploring the Betsy Rymes' Three-Dimensional Approach: A Review of Classroom Discourse Analysis: A Tool for Critical Reflection

2019 ◽  
Author(s):  
Ufuk Keles
Keyword(s):  
Discourse Analysis ◽  
Classroom Discourse ◽  
Critical Reflection ◽  
Teaching Practice ◽  
Three Dimensional ◽  
Point Of View ◽  
Three Dimensions ◽  
Dimensional Approach ◽  
Classroom Discourse Analysis ◽  
Distinctive Features

This book review examines the 2nd edition of Betsy Rymes' Classroom Discourse Analysis: A Tool for Critical Reflection. It includes an outline of each chapter's content, discusses the several distinctive features of the book, and its possible contribution to educational research from a practitioner's point of view. The book has nine chapters. The first four chapters first introduce the readers to basic concepts of discourse analysis within a three-dimensional approach, and then provides techniques and strategies for recording, viewing, transcribing and analyzing classroom talk through examples, activities, and questions. From Chapter V to VIII, Rymes focuses on particular resources utilized in classroom discourse such as turn taking, contextualization, storytelling and framing. Chapter IX revisits the three dimensions of classroom discourse and discusses how such a perspective may be integrated in teaching practice with an understanding of individual communicative repertoire. Overall, the book is a how-to-book for in-service teachers who would like to resolve issues of communication in their classrooms, and develop their interaction with their students.

convergent-beam diffraction from surfaces

1987 ◽  
Vol 45 ◽  
pp. 30-33
Author(s):  
J. A. Eades ◽  
A. E. Smith ◽  
D. F. Lynch
Keyword(s):  
Reciprocal Lattice ◽  
Three Dimensional ◽  
Grazing Incidence ◽  
Three Dimensions ◽  
Plane Figure ◽  
Transmission Electron ◽  
Convergent Beam ◽  
Beam Patterns ◽  
Beam Diffraction

It is quite simple (in the transmission electron microscope) to obtain convergent-beam patterns from the surface of a bulk crystal. The beam is focussed onto the surface at near grazing incidence (figure 1) and if the surface is flat the appropriate pattern is obtained in the diffraction plane (figure 2). Such patterns are potentially valuable for the characterization of surfaces just as normal convergent-beam patterns are valuable for the characterization of crystals.There are, however, several important ways in which reflection diffraction from surfaces differs from the more familiar electron diffraction in transmission.GeometryIn reflection diffraction, because of the surface, it is not possible to describe the specimen as periodic in three dimensions, nor is it possible to associate diffraction with a conventional three-dimensional reciprocal lattice.

Extension of the Spatial PDI Model to Three Dimensions

1997 ◽  
Vol 84 (1) ◽  
pp. 176-178
Author(s):  
Frank O'Brien
Keyword(s):  
Population Density ◽  
Dimensional Space ◽  
Finite Lattice ◽  
Three Dimensional ◽  
Upper Bounds ◽  
Three Dimensions ◽  
Lower And Upper Bounds ◽  
Density Index ◽  
Three Dimensional Space

The author's population density index ( PDI) model is extended to three-dimensional distributions. A derived formula is presented that allows for the calculation of the lower and upper bounds of density in three-dimensional space for any finite lattice.

Sign in / Sign up

Export Citation Format

Share Document