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Journal articles on the topic 'Streamline density'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Cheng, Hao, Ichiro Osako, Akhil Datta-Gupta, and Michael J. King. "A Rigorous Compressible Streamline Formulation for Two and Three-Phase Black-Oil Simulation." SPE Journal 11, no. 04 (2006): 407–17. http://dx.doi.org/10.2118/96866-pa.

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Summary Streamline simulators have received increased attention in the petroleum industry because of their ability to effectively handle multimillion-cell detailed geologic models and large simulation models. The efficiency of streamline simulation has relied primarily on the decoupling of the 3D saturation equation into 1D equations along streamlines using the streamline time of flight as the spatial coordinate. Until now, this decoupling has been strictly valid for incompressible flow. Applications to compressible flow have generally lacked strong theoretical foundations, and very often yiel

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2

Hollister, Brad E., and Alex Pang. "Uncertainty Rank for Streamline Ensembles." Journal of Imaging Science and Technology 64, no. 2 (2020): 20504–1. http://dx.doi.org/10.2352/j.imagingsci.technol.2020.64.2.020504.

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Abstract Traditional spaghetti plots from ensemble data provide no explicit information as to the uncertainty of the realization flow paths. While intuitive assessment can be used when visualizing streamline density directly in such a plot, the display is often cluttered and difficult to interpret. The authors present a method to measure uncertainty and visualize member streamlines from an ensemble of vector fields. The method incorporates velocity probability density as a feature along each member streamline. The authors show visualizations of two different data sets using the proposed method

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3

Treguier, A. M., M. England, S. R. Rintoul, G. Madec, J. Le Sommer, and J. M. Molines. "Southern Ocean overturning across streamlines in an eddying simulation of the Antarctic Circumpolar Current." Ocean Science Discussions 4, no. 4 (2007): 653–98. http://dx.doi.org/10.5194/osd-4-653-2007.

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Abstract. An eddying global model is used to study the characteristics of the Antarctic Circumpolar Current (ACC) in a streamline-following framework. In the upper layers, the meridional circulation across streamlines agrees with the theoretical view: an equatorward mean flow partially cancelled by a poleward eddy mass flux. The same calculation in a zonal average gives a completely different view and underestimates the eddy effects. Two model simulations, in which the buoyancy forcing above the ACC changes from positive to negative, suggest that the relationship between the residual meridiona

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Cortesi, Matteo, Giorgio Gatta, Giovanni Michielon, Rocco Di Michele, Sandro Bartolomei, and Raffaele Scurati. "Passive Drag in Young Swimmers: Effects of Body Composition, Morphology and Gliding Position." International Journal of Environmental Research and Public Health 17, no. 6 (2020): 2002. http://dx.doi.org/10.3390/ijerph17062002.

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The passive drag (Dp) during swimming is affected by the swimmer’s morphology, body density and body position. We evaluated the relative contribution of morphology, body composition, and body position adjustments in the prediction of a swimmer’s Dp. This observational study examined a sample of 60 competitive swimmers (31 male and 29 female) with a mean (±SD) age of 15.4 ± 3.1 years. The swimmer’s Dp was measured using an electro-mechanical towing device and the body composition was assessed using a bioelectrical impedance analyser. Body lengths and circumferences were measured in both the sta

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Cherni, Emna, Benoît Champagne, Sameh Ayadi, and Vincent Liégeois. "Magnetically-induced current density investigation in carbohelicenes and azahelicenes." Physical Chemistry Chemical Physics 21, no. 27 (2019): 14678–91. http://dx.doi.org/10.1039/c9cp02071c.

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6

Treguier, A. M., M. H. England, S. R. Rintoul, G. Madec, J. Le Sommer, and J. M. Molines. "Southern Ocean overturning across streamlines in an eddying simulation of the Antarctic Circumpolar Current." Ocean Science 3, no. 4 (2007): 491–507. http://dx.doi.org/10.5194/os-3-491-2007.

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Abstract. An eddying global model is used to study the characteristics of the Antarctic Circumpolar Current (ACC) in a streamline-following framework. Previous model-based estimates of the meridional circulation were calculated using zonal averages: this method leads to a counter-intuitive poleward circulation of the less dense waters, and underestimates the eddy effects. We show that on the contrary, the upper ocean circulation across streamlines agrees with the theoretical view: an equatorward mean flow partially cancelled by a poleward eddy mass flux. Two model simulations, in which the buo

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Song, P., C. T. Russell, J. T. Gosling, M. Thomsen, and R. C. Elphic. "Observations of the density profile in the magnetosheath near the stagnation streamline." Geophysical Research Letters 17, no. 11 (1990): 2035–38. http://dx.doi.org/10.1029/gl017i011p02035.

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8

Cheng, Hao, Adedayo Stephen Oyerinde, Akhil Datta-Gupta, and William J. Milliken. "Compressible Streamlines and Three-Phase History Matching." SPE Journal 12, no. 04 (2007): 475–85. http://dx.doi.org/10.2118/99465-pa.

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Summary Reconciling high-resolution geologic models to field production history is still by far the most time-consuming aspect of the workflow for both geoscientists and engineers. Recently, streamline-based assisted and automatic history-matching techniques have shown great potential in this regard, and several field applications have demonstrated the feasibility of the approach. However, most of these applications have been limited to two-phase water/oil flow under incompressible or slightly compressible conditions. We propose an approach to history matching three-phase flow using a novel co

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9

WU, ZUO-BING. "STREAMLINE TOPOLOGY AND DILUTE PARTICLE DYNAMICS IN A KÁRMÁN VORTEX STREET FLOW." International Journal of Bifurcation and Chaos 13, no. 05 (2003): 1275–86. http://dx.doi.org/10.1142/s0218127403007217.

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Three types of streamline topology in a Kármán vortex street flow are shown under the variation of spatial parameters. For the motion of dilute particles in the Kármán vortex street flow, there exist a route of bifurcation to a chaotic orbit and more attractors in a bifurcation diagram for the proportion of particle density to fluid density. Along with the increase of spatial parameters in the flow field, the bifurcation process is suspended, as well as more and more attractors emerge. In the motion of dilute particles, a drag term and gravity term dominate and result in the bifurcation phenom

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10

Snyder, William H., Roger S. Thompson, Robert E. Eskridge, et al. "The structure of strongly stratified flow over hills: dividing-streamline concept." Journal of Fluid Mechanics 152 (March 1985): 249–88. http://dx.doi.org/10.1017/s0022112085000684.

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In stably stratified flow over a three-dimensional hill, we can define a dividing streamline that separates those streamlines that pass around the hill from those that pass over the hill. The height Hs of this dividing streamline can be estimated by Sheppard's simple energy argument; fluid parcels originating far upstream of a hill at an elevation above Hs have sufficient kinetic energy to rise over the top, whereas those below Hs must pass around the sides. This prediction provides the basis for analysing an extensive range of laboratory observations and measurements of stably stratified flow

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Zadobrischi, Eduard, Lucian-Mihai Cosovanu, and Mihai Dimian. "Traffic Flow Density Model and Dynamic Traffic Congestion Model Simulation Based on Practice Case with Vehicle Network and System Traffic Intelligent Communication." Symmetry 12, no. 7 (2020): 1172. http://dx.doi.org/10.3390/sym12071172.

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The massive increase in the number of vehicles has set a precedent in terms of congestion, being one of the important factors affecting the flow of traffic, but there are also effects on the world economy. The studies carried out so far try to highlight solutions that will streamline the traffic, as society revolves around transportation and its symmetry. Current research highlights that the increased density of vehicles could be remedied by dedicated short-range communications (DSRC) systems through communications of the type vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I) or vehicl

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Petracca, M., S. Schiavi, M. Battocchio, et al. "Streamline density and lesion volume reveal a postero–anterior gradient of corpus callosum damage in multiple sclerosis." European Journal of Neurology 27, no. 6 (2020): 1076–82. http://dx.doi.org/10.1111/ene.14214.

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13

Kaydani, Hossein, Ali Mohebbi, and Amir Ahmad Forghani. "Lattice Boltzmann Simulation of Natural Convection in a Fractured Petroleum Reservoir Domain: Single-Phase and Multi-Phases Investigations." Open Petroleum Engineering Journal 11, no. 1 (2018): 48–66. http://dx.doi.org/10.2174/1874834101811010048.

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Background:Natural convection is one of the main effective production mechanisms in a fractured petroleum reservoir.Objective:This paper investigated the simulation of natural convection heat transfer in a fracture domain of petroleum reservoir.Methods:This is done by using Lattice-Boltzmann Equation (LBE) method. In this study, a D2Q9 lattice model was coupled with the passive-scalar lattice thermal model to represent density, velocity and internal energy distribution function, respectively.Results and Conclusion:The results were in excellent agreement with CFD results from the literature. Th

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Li, Weipeng, and Lipo Wang. "Geometrical structure analysis of a zero-pressure-gradient turbulent boundary layer." Journal of Fluid Mechanics 846 (May 4, 2018): 318–40. http://dx.doi.org/10.1017/jfm.2018.249.

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The present work focuses on the geometrical features of a zero-pressure-gradient turbulent boundary layer based on vectorline segment analysis. In a turbulent vector field, tracing from any non-singular point, along either the vector or the inverse direction, one will reach a local extremum of the vector magnitude. The vectorline between the two local extrema is defined as the vectorline segment corresponding to the given spatial point. Specifically the vectorline segment can be the streamline segment for the velocity vector case, or the vorticity line segment for the vorticity vector case. Su

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15

EAMES, I., and J. C. R. HUNT. "Inviscid flow around bodies moving in weak density gradients without buoyancy effects." Journal of Fluid Mechanics 353 (December 25, 1997): 331–55. http://dx.doi.org/10.1017/s002211209700760x.

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We examine the inviscid flow generated around a body moving impulsively from rest with a constant velocity U in a constant density gradient, ∇ρ0, which is assumed to be weak in the sense ε=a[mid ]∇ρ0[mid ] /ρ0[Lt ]1, where a is the length scale of the body. In the absence of a density gradient (ε=0), the flow is irrotational and no force acts on the body. When 0<ε[Lt ]1, vorticity is generated by a baroclinic torque and vortex stretching, which introduce a rotational component into the flow. The aim is to calculate both the flow around the body and the force acting on it.When a two-dimensio

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Mu, Yue, Guo Qun Zhao, and Cheng Rui Zhang. "Numerical Investigation of Viscoelastic Flow and Swell Behaviors of Polymer Melts in the Hollow Profile Extrusion Process." Advanced Materials Research 97-101 (March 2010): 209–13. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.209.

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The viscoelastic flow and swell behaviors of polymer melts in the profile extrusion process can significantly influence the performance and dimension of the final products. In the study, the viscoelastic flow pattern of a commercial low density polyethylene (LDPE) extruded through out of the hollow profiled extrusion die is investigated by means of finite element simulation. The mathematical model of three-dimensional viscoelastic flow and swell of polymer melts is established with a differential Phan-Thien and Tanner (PTT) constitutive model. A penalty method is employed to solve the non-line

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Jones, J. T., M. DiFrancesco, A. I. Zaal, et al. "Childhood-onset lupus with clinical neurocognitive dysfunction shows lower streamline density and pairwise connectivity on diffusion tensor imaging." Lupus 24, no. 10 (2015): 1081–86. http://dx.doi.org/10.1177/0961203315572718.

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18

Akin, O., and D. Rockwell. "Flow Structure in a Radial Flow Pumping System Using High-Image-Density Particle Image Velocimetry." Journal of Fluids Engineering 116, no. 3 (1994): 538–44. http://dx.doi.org/10.1115/1.2910310.

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Use of high-image-density particle image velocimetry (PIV) allows characterization of the instantaneous structure of wake and wake-blade interactions in a simulated rotating machine. The distribution of vorticity over an entire plane within the pumping system is related to the instantaneous pressure source terms in the wake of the impeller. Comparison of instantaneous and ensemble-averaged vorticity contours shows that limited ensemble-averaging can produce a substantial reduction in vorticity levels associated with the instantaneous pressure source terms. When the wake from the impeller inter

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19

DASH, SUNIL MANOHAR, THONG-SEE LEE, and HAIBO HUANG. "A NOVEL FLEXIBLE FORCING HYBRID IB-LBM SCHEME TO SIMULATE FLOW PAST CIRCULAR CYLINDER." International Journal of Modern Physics C 25, no. 01 (2013): 1340014. http://dx.doi.org/10.1142/s0129183113400147.

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A novel flexible forcing immersed boundary and lattice Boltzmann method (IB-LBM) is introduced in this paper. In the conventional IB-LBM scheme, explicit calculation of the force density term may not guarantee exact satisfaction of the no-slip boundary condition. This produces unphysical streamline penetration into the solid object. In this study, an implicit approach is followed where the force density is obtained from the unknown velocity correction with a unique single Lagrangian velocity correction term and flexible number of forcing steps. The proposed algorithm is computationally efficie

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20

He, Ji Lin, Yun Rong Ma, Dong Li, Yao Tan, and Lei Xu. "Numerical Simulation of Curing Deformation of Thermosetting Resin Matrix Composite Curved Structure." Applied Mechanics and Materials 684 (October 2014): 145–53. http://dx.doi.org/10.4028/www.scientific.net/amm.684.145.

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The evolutions of physical properties of composites during the curing process of the carbon fibre reinforced resin composite, such as density, modulus, coefficient of thermal expansion, specific heat capacity and thermal conductivity, were analyzed and those evolutions were introduced into the numerical simulation. The new approach to construct the curvilinear coordinate system by streamline equation of steady flow was proposed with the complex curved structure composite as the study object. By using the finite-element method and building the curvilinear coordinate system, the distribution of

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21

Heister, S. D., J. M. Mcdonough, A. R. Karagozian, and D. W. Jenkins. "The compressible vortex pair." Journal of Fluid Mechanics 220 (November 1990): 339–54. http://dx.doi.org/10.1017/s0022112090003287.

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A numerical solution for the flow field associated with a compressible pair of counter-rotating vortices is developed. The compressible, two-dimensional potential equation is solved utilizing the numerical method of Osher et al. (1985) for flow regions in which a non-zero density exists. Close to the vortex centres, vacuum ‘cores’ develop owing to the existence of a maximum achievable flow speed in a compressible flow field. A special treatment is required to represent these vacuum cores. Typical streamline patterns and core boundaries are obtained for upstream Mach numbers as high as 0.3, and

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22

Peng, Diane, and Baqar Tabrez. "Design, Processes & Technology Co-design Methodology." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2019, DPC (2019): 000932–54. http://dx.doi.org/10.4071/2380-4491-2019-dpc-presentation_wp2_027.

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Costs, design complexity and manufacturing risks are creating opportunities with a rapid convergence of the traditional IC design and IC package design processes. For the goal of achieving the electrical (SI/PI) performance requirements of a complex SoC design, choices of package technology, impact of material selection, process flow optimization are critical factors with increasing challenges to overcome. We have undertaken a co-design methodology to optimize the IC chip layout and substrate design to streamline assembly processes while assimilating the physical and logical interactions withi

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23

Berhe, M. K., and S. V. Patankar. "Curvature Effects on Discrete-Hole Film Cooling." Journal of Turbomachinery 121, no. 4 (1999): 781–91. http://dx.doi.org/10.1115/1.2836732.

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A numerical study has been conducted to investigate the effects of surface curvature on cooling effectiveness using three-dimensional film cooling geometries that included the mainflow, injection hole, and supply plenum regions. Three surfaces were considered in this study, namely, convex, concave, and flat surfaces. The fully elliptic, three-dimensional Navier–Stokes equations were solved over a body-fitted grid. The effects of streamline curvature were taken into account by using algebraic relations for the turbulent viscosity and the turbulent Prandtl number in a modified k–ε turbulence mod

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Pavlenko, Ivan, Oleksandr Liaposhchenko, Marek Ochowiak, et al. "Three-Dimensional Mathematical Model of the Liquid Film Downflow on a Vertical Surface." Energies 13, no. 8 (2020): 1938. http://dx.doi.org/10.3390/en13081938.

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Film downflow from captured liquid without wave formation and its destruction is one of the most important aspects in the development of separation equipment. Consequently, it is necessary to create well-organized liquid draining in areas of captured liquid. Thus, the proposed 3D mathematical model of film downflow allows for the determination of the hydrodynamic parameters of the liquid film flow and the interfacial surface. As a result, it was discovered that the interfacial surface depends on the proposed dimensionless criterion, which includes internal friction stress, channel length, and

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25

Liu, Wei, Zhengdong Huang, and Yunhua Liu. "An isogeometric analysis approach for solving the Reynolds equation in textured piston ring – cylinder liner contacts." Engineering Computations 37, no. 9 (2020): 3045–78. http://dx.doi.org/10.1108/ec-03-2019-0076.

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Purpose The purpose of this study is to propose an isogeometric analysis (IGA) approach for solving the Reynolds equation in textured piston ring cylinder liner (PRCL) contacts. Design/methodology/approach The texture region is accurately and conveniently expressed by non-uniform rational B-splines (NURBS) besides hydrodynamic pressure and the oil film density ratio is represented in this mathematical form. A quadratic programming method combined with a Lagrange multiplier method is developed to address the cavitation issue. Findings The comparison with the results solved by an analytical meth

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Winters, Kraig B., and Laurence Armi. "Topographic control of stratified flows: upstream jets, blocking and isolating layers." Journal of Fluid Mechanics 753 (July 16, 2014): 80–103. http://dx.doi.org/10.1017/jfm.2014.363.

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AbstractOptimal solutions to the nonlinear, hydrostatic, Boussinesq equations are developed for steady, density-stratified, topographically controlled flows characterized by blocking and upstream influence. These flows are jet-like upstream of an isolated obstacle and are contained within an asymmetric, thinning stream tube that is accelerated as it passes over the crest. A stagnant, nearly uniform-density isolating layer, surrounded by a bifurcated uppermost streamline, separates the accelerated flow from an uncoupled flow above. The flows are optimal in the sense that, for a given stratifica

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Winters, Kraig B. "The turbulent transition of a supercritical downslope flow: sensitivity to downstream conditions." Journal of Fluid Mechanics 792 (March 8, 2016): 997–1012. http://dx.doi.org/10.1017/jfm.2016.113.

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Blocked, continuously stratified, crest-controlled flows have hydraulically supercritical downslope flow in the lee of a ridge-like obstacle. The downslope flow separates from the obstacle and, depending on conditions further downstream, transitions to a subcritical state. A controlled, stratified overflow and its transition to a subcritical state are investigated here in a set of three-dimensional numerical experiments in which the height of a second, downstream ridge is varied. The downslope flow is associated with an isopycnal and streamline bifurcation, which acts to form a nearly-uniform-

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28

Angliss, R. P., M. C. Ferguson, P. Hall, V. Helker, A. Kennedy, and T. Sformo. "Comparing manned to unmanned aerial surveys for cetacean monitoring in the Arctic: methods and operational results." Journal of Unmanned Vehicle Systems 6, no. 3 (2018): 109–27. http://dx.doi.org/10.1139/juvs-2018-0001.

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Manned aerial surveys are routinely used to assess cetacean distribution and density, often over large geographic areas. Unmanned aircraft systems (UAS) have been identified as a technology that could augment or replace manned aerial surveys for cetaceans. To understand what research questions involving cetacean distribution and density can be addressed using manned and UAS technology in the Arctic, we conducted paired aerial surveys for cetaceans near Utqiaġvik (Barrow), Alaska. We present the methods and operational results from the project, and challenges encountered during the field work.

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29

Chrenko, Ondřej, and Michiel Lambrechts. "Oscillatory migration of accreting protoplanets driven by a 3D distortion of the gas flow." Astronomy & Astrophysics 626 (June 2019): A109. http://dx.doi.org/10.1051/0004-6361/201935334.

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Context. The dynamics of a low-mass protoplanet accreting solids is influenced by the heating torque, which was found to suppress inward migration in protoplanetary disks with constant opacities. Aims. We investigate the differences in the heating torque between disks with constant and temperature-dependent opacities. Methods. Interactions of a super-Earth-sized protoplanet with the gas disk are explored using 3D radiation hydrodynamic simulations. Results. Accretion heating of the protoplanet creates a hot underdense region in the surrounding gas, leading to misalignment of the local density

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30

Sleiti, A. K., and J. S. Kapat. "Fluid Flow and Heat Transfer in Rotating Curved Duct at High Rotation and Density Ratios." Journal of Turbomachinery 127, no. 4 (2005): 659–67. http://dx.doi.org/10.1115/1.2019276.

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Prediction of flow field and heat transfer of high rotation numbers and density ratio flow in a square internal cooling channels of turbine blades with U-turn as tested by Wagner et al. (ASME J. Turbomach., 113, pp. 42–51, 1991) is the main focus of this study. Rotation, buoyancy, and strong curvature affect the flow within these channels. Due to the fact that RSM turbulence model can respond to the effects of rotation, streamline curvature and anisotropy without the need for explicit modeling, it is employed for this study as it showed improved prediction compared to isotropic two-equation mo

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31

Ellingson, Benjamin M., Noriko Salamon, Davis C. Woodworth, and Langston T. Holly. "Correlation between degree of subvoxel spinal cord compression measured with super-resolution tract density imaging and neurological impairment in cervical spondylotic myelopathy." Journal of Neurosurgery: Spine 22, no. 6 (2015): 631–38. http://dx.doi.org/10.3171/2014.10.spine14222.

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OBJECT The purpose of this study was to explore the use of super-resolution tract density images derived from probabilistic diffusion tensor imaging (DTI) tractography of the spinal cord as an imaging surrogate for microstructural integrity and functional impairment in patients with cervical spondylosis. METHODS Structural MRI and DTI images were collected for 27 patients with cervical spondylosis with (n= 21) and without (n= 6) functional impairment as defined by the modified Japanese Orthopaedic Association Scale (mJOA). DTI was performed axially through the site of compression in a total of

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32

Krebs, Peter, Anastasios I. Stamou, Jaime L. García-Heras, and Wolfgang Rodi. "Influence of inlet and outlet configuration on the flow in secondary clarifiers." Water Science and Technology 34, no. 5-6 (1996): 1–9. http://dx.doi.org/10.2166/wst.1996.0528.

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A numerical model for predicting the flow in clarifiers is presented which accounts for density-affected and turbulent flow as well as for the settling of activated sludge. The reliability of the two-dimensional model is demonstrated through verification by means of a laboratory experiment which was specially designed for this purpose. The numerical model is then applied for an evaluation of inlet and outlet arrangements. The inlet is positioned at the bottom and the inlet aperture is varied. An outlet at the top of the end wall is compared with outlets longitudinally extended at the surface.

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Ferdows, Reddy, Alzahrani, and Sun. "Heat and Mass Transfer in a Viscous Nanofluid Containing a Gyrotactic Micro-Organism Over a Stretching Cylinder." Symmetry 11, no. 9 (2019): 1131. http://dx.doi.org/10.3390/sym11091131.

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This work consists of a theoretical boundary layer analysis of heat and mass transport in a viscous fluid-embracing gyrotactic micro-organism over a cylinder. The flow governing equations are modeled through boundary layer approximations. The governing non-linear partial differential equations are lessened to a set of nonlinear ordinary differential equations using similitude transformation. The boundary layer equations are elucidated numerically, applying the spectral relaxation method with the aid of the computational software MATLAB. The impact of several pertinent parameters on flow convec

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Toland, J. F. "Heavy hydroelastic travelling waves." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 463, no. 2085 (2007): 2371–97. http://dx.doi.org/10.1098/rspa.2007.1883.

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This is a mathematical study of steady two-dimensional waves of prescribed period which propagate without change of form on the surface of an infinitely deep expanse of fluid that is moving under gravity and bounded above by heavy, frictionless, thin elastic sheet. The flow, which is supposed irrotational, is at rest at infinite depth and its velocity is stationary relative to a frame moving with the wave. In that frame, the elastic sheet coincides with the zero streamline and its material points move according to the equations of hyperelasticity. From the mechanics of the surface material, th

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Helfrich, K. R., and B. L. White. "A model for large-amplitude internal solitary waves with trapped cores." Nonlinear Processes in Geophysics 17, no. 4 (2010): 303–18. http://dx.doi.org/10.5194/npg-17-303-2010.

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Abstract. Large-amplitude internal solitary waves in continuously stratified systems can be found by solution of the Dubreil-Jacotin-Long (DJL) equation. For finite ambient density gradients at the surface (bottom) for waves of depression (elevation) these solutions may develop recirculating cores for wave speeds above a critical value. As typically modeled, these recirculating cores contain densities outside the ambient range, may be statically unstable, and thus are physically questionable. To address these issues the problem for trapped-core solitary waves is reformulated. A finite core of

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Xie, Ke, Fang Wu, Jia Li Wu, et al. "The Study on the Relationship between Spatial Network Structure of Teaching Architecture and Students' Flow Behavior Based on Complex Network Analysis." Applied Mechanics and Materials 878 (February 2018): 183–96. http://dx.doi.org/10.4028/www.scientific.net/amm.878.183.

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Informal learning is an important part of active learning in higher education. It is of great significance to create a good informal learning space for higher education. However, the current design of university buildings is lack of quality informal learning space. This paper analyzes the relationship between complex network analysis and student behavior, and finds that there exists a close relationship between them. The spatial structure has the essential impact on the distribution of the informal learning. The construction of streamline system places an important role in the formation of lea

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Jennions, I. K., and P. Stow. "A Quasi-Three-Dimensional Turbomachinery Blade Design System: Part I—Throughflow Analysis." Journal of Engineering for Gas Turbines and Power 107, no. 2 (1985): 301–7. http://dx.doi.org/10.1115/1.3239715.

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The purpose of this work has been to develop a quasi-three-dimensional blade design and analysis system incorporating fully linked throughflow, blade-to-blade and blade section stacking programs. In Part I of the paper, the throughflow analysis is developed. This is based on a rigorous passage averaging technique to derive throughflow equations valid inside a blade row. The advantages of this approach are that the meridional streamsurface does not have to be of a prescribed shape, and by introducing density weighted averages the continuity equation is of an exact form. Included in the equation

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Echols, Nathaniel, Nader Morshed, Nigel Moriarty, Pavel Afonine, Thomas Terwilliger, and Paul Adams. "New tools for automated model completion and refinement." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C327. http://dx.doi.org/10.1107/s2053273314096727.

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Although macromolecular crystallography has been greatly accelerated by the development of automated software for data processing, phasing, and model building, most structures require significant manual intervention to yield a truly final model. In addition to missing individual protein or nucleic residues, this may include the addition of alternate conformations, ligands (both free and covalently bound), elemental ions, or modified amino acids. We have developed a number of tools to streamline several of these steps within the Phenix software suite (Adams et al. 2010): 1) an automated pipelin

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MISTRANGELO, C. "Topological analysis of separation phenomena in liquid metal flow in sudden expansions. Part 2. Magnetohydrodynamic flow." Journal of Fluid Mechanics 674 (March 23, 2011): 132–62. http://dx.doi.org/10.1017/s0022112011000607.

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A numerical study has been carried out to analyse liquid metal flows in a sudden expansion of electrically conducting rectangular ducts under the influence of an imposed uniform magnetic field. Separation phenomena are investigated by selecting a reference Reynolds number and by increasing progressively the applied magnetic field. The magnetic effects leading to the reduction of the size of separation zones that form behind the cross-section enlargement are studied by considering modifications of flow topology, streamline patterns and electric current density distribution. In the range of para

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Shepel, Sergey V., Brian L. Smith, and Samuel Paolucci. "Implementation of a Level Set Interface Tracking Method in the FIDAP and CFX-4 Codes." Journal of Fluids Engineering 127, no. 4 (2005): 674–86. http://dx.doi.org/10.1115/1.1949636.

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We present a streamline-upwind–Petrov-Galerkin (SUPG) finite element level set method that may be implemented into commercial computational fluid dynamics (CFD) software, both finite element (FE) and finite volume (FV) based, to solve problems involving incompressible, two-phase flows with moving interfaces. The method can be used on both structured and unstructured grids. Two formulations are given. The first considers the coupled motion of the two phases and is implemented within the framework of the commercial CFD code CFX-4. The second can be applied for those gas-liquid flows for which ef

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Findlay, M. J., M. Salcudean, and I. S. Gartshore. "Jets in a Crossflow: Effects of Geometry and Blowing Ratio." Journal of Fluids Engineering 121, no. 2 (1999): 373–78. http://dx.doi.org/10.1115/1.2822216.

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The flow field characteristics of three different geometries of square jets in a crossflow at various blowing ratios are examined. The geometries considered are: perpendicular, streamwise-inclined, and spanwise-inclined jets. The inclined jets are at a 30 deg angle to the wind tunnel floor. Mean velocity and turbulence measurements along with film cooling effectiveness and scalar transport data were obtained. Jet-to-crossflow blowing ratios of 1.5, 1.0 and 0.5 are used with a density ratio of 1. It is shown that the flow field at the jet exit is strongly influenced by the crossflow as well as

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Hossain, Md Monir, and Anne E. Staples. "Mass Transport and Turbulent Statistics within Two Branching Coral Colonies." Fluids 5, no. 3 (2020): 153. http://dx.doi.org/10.3390/fluids5030153.

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Large eddy simulations were performed to characterize the flow and mass transport mechanisms in the interior of two Pocillopora coral colonies with different geometries, one with a relatively loosely branched morphology (P. eydouxi), and the other with a relatively densely branched structure (P. meandrina). Detailed velocity vector and streamline fields were obtained inside both corals for the same unidirectional oncoming flow, and significant differences were found between their flow profiles and mass transport mechanisms. For the densely branched P. meandrina colony, a significant number of

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Kasbaoui, M. Houssem, Donald L. Koch, Ganesh Subramanian, and Olivier Desjardins. "Preferential concentration driven instability of sheared gas–solid suspensions." Journal of Fluid Mechanics 770 (March 30, 2015): 85–123. http://dx.doi.org/10.1017/jfm.2015.136.

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We examine the linear stability of a homogeneous gas–solid suspension of small Stokes number particles, with a moderate mass loading, subject to a simple shear flow. The modulation of the gravitational force exerted on the suspension, due to preferential concentration of particles in regions of low vorticity, in response to an imposed velocity perturbation, can lead to an algebraic instability. Since the fastest growing modes have wavelengths small compared with the characteristic length scale ($U_{g}/{\it\Gamma}$) and oscillate with frequencies large compared with ${\it\Gamma}$, $U_{g}$ being

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Kulla, Ladislav, Ivan Sačkov, and Miroslav Juriš. "Test of airborne laser scanning ability to refine and streamline growing stock estimations by yield tables in different stand structures." Forestry Journal 62, no. 1 (2016): 39–47. http://dx.doi.org/10.1515/forj-2016-0005.

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Abstract Even if stand inventories based on growth tables have been widely discussed over the last years, this method of forest mensuration is still widely applied due to favourable ratio between costs and achievable precision of stand growing stock estimation. The aim of the study was to verify the potential of airborne laser scanning data (ALS) for direct estimation of mean stand height and mean stand density (stocking) as fundamental inputs for forest mensuration based on yield tables. The material from two reference plots with substantially different stand structure was processed by REFLEX

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Deng, Zhian, Hao Yun Deng, and Mei Xie. "Numerical Simulation on Flow Field inside the Drainage Valve of the Natural Gas Pipeline." Advanced Materials Research 853 (December 2013): 377–83. http://dx.doi.org/10.4028/www.scientific.net/amr.853.377.

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In order to ensure safety and reliable operation of the natural gas pipeline drainage valve,the 3D numerical simulation on flow field characteristics inside the drainage valve of the natural gas pipeline under the different conditions of the seasons of winter and summer is carried out by using the standard model. In the tow different season condition, the streamline and velocity vector distribution inside the drainage valve has been studied. Under the two seasons conditions are studied. The results show that as the change of drainage valve opening the turbulence appear in the valve and the max

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LIN, J. C., and D. ROCKWELL. "Horizontal oscillations of a cylinder beneath a free surface: vortex formation and loading." Journal of Fluid Mechanics 389 (June 25, 1999): 1–26. http://dx.doi.org/10.1017/s0022112099004747.

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The patterns of vortex formation from a cylinder oscillating in a horizontal plane, located at various depths of submergence beneath a free surface, are characterized using high-image-density particle image velocimetry (PIV). Instantaneous representations of the velocity field, streamline topology and vorticity patterns are referenced to the instantaneous velocity of the cylinder. In turn, these features are related to the magnitude and phase of the instantaneous transverse force, which can exhibit highly nonlinear, spike-like fluctuations. When a finite gap is maintained between the free surf

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Kumar, B. V. Rathish. "A Segregated SUPG/FEM for THDL Analysis In High Speed Slider Bearings With Injection Effect." Journal of Tribology 123, no. 4 (2000): 732–41. http://dx.doi.org/10.1115/1.1339980.

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In this study, a segregated Finite Element Method (FEM) in the Petrov Galerkin framework with suitably defined Streamline Upwind Petrov Galerkin (SUPG) weight functions for a non-isothermal flow with temperature dependent density and viscosity in a high speed slider bearing has been proposed. The nonlinear partial differential equations (PDEs) governing the mass, momentum and energy conservations in thermohydrodynamic lubrication (THDL) of a high speed slider bearing with injection effects has been numerically analyzed for temperature, velocity and pressure fields. To assess the influence of t

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Wang, Wei, and Linlin Wang. "An Experimental Investigation of Viscoelastic Flow in a Contraction Channel." Polymers 13, no. 11 (2021): 1876. http://dx.doi.org/10.3390/polym13111876.

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In order to assess the predictive capability of the S–MDCPP model, which may describe the viscoelastic behavior of the low-density polyethylene melts, a planar contraction flow benchmark problem is calculated in this investigation. A pressure-stabilized iterative fractional step algorithm based on the finite increment calculus (FIC) method is adopted to overcome oscillations of the pressure field due to the incompressibility of fluids. The discrete elastic viscous stress splitting (DEVSS) technique in combination with the streamline upwind Petrov-Galerkin (SUPG) method are employed to calculat

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Luzzatto-Fegiz, Paolo, and Karl R. Helfrich. "Laboratory experiments and simulations for solitary internal waves with trapped cores." Journal of Fluid Mechanics 757 (September 19, 2014): 354–80. http://dx.doi.org/10.1017/jfm.2014.501.

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AbstractWe perform simultaneous coplanar measurements of velocity and density in solitary internal waves with trapped cores, as well as viscous numerical simulations. Our set-up comprises a thin stratified layer (approximately 15 % of the overall fluid depth) overlaying a deep homogeneous layer. We consider waves propagating near a free surface, as well as near a rigid no-slip lid. In the free-surface case, all trapped-core waves exhibit a strong shear instability. We propose that Marangoni effects are responsible for this instability, and use our velocity measurements to perform quantitative

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Wu, Xiaodong, Falk Feddersen, Sarah N. Giddings, Nirnimesh Kumar, and Ganesh Gopalakrishnan. "Mechanisms of Mid- to Outer-Shelf Transport of Shoreline-Released Tracers." Journal of Physical Oceanography 50, no. 7 (2020): 1813–37. http://dx.doi.org/10.1175/jpo-d-19-0225.1.

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AbstractTransport of shoreline-released tracer from the surfzone across the shelf can be affected by a variety of physical processes from wind-driven to submesoscale, with implications for shoreline contaminant dilution and larval dispersion. Here, a high-resolution wave–current coupled model that resolves the surfzone and receives realistic oceanic and atmospheric forcing is used to simulate dye representing shoreline-released untreated wastewater in the San Diego–Tijuana region. Surfzone and shelf alongshore dye transports are primarily driven by obliquely incident wave breaking and alongsho

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