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  • Articles  (155)
  • Springer  (155)
  • American Chemical Society
  • American Chemical Society (ACS)
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  • Institute of Electrical and Electronics Engineers (IEEE)
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  • 2015-2019  (86)
  • 2005-2009  (69)
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  • 2017  (86)
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  • Journal of Visualization  (27)
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  • Computer Science  (155)
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  • Articles  (155)
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  • Springer  (155)
  • American Chemical Society
  • American Chemical Society (ACS)
  • American Geophysical Union
  • Institute of Electrical and Electronics Engineers
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  • 2015-2019  (86)
  • 2005-2009  (69)
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  • Computer Science  (155)
  • 1
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    Image analyses of supersonic air-intake buzz and control by natural ventilation (2017)
    Springer
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    Publication Date: 2017-02-17
    Description: Intake buzz was initiated on a typical two-dimensional supersonic air-intake model at various supersonic Mach numbers up to 3 by gradually changing the back pressure from supercritical to subcritical operating condition in a wind tunnel. Schlieren pictures from a still camera and a high-speed camera were recorded. Analyses of individual high-speed images of the unvented intake were carried out to locate the time-dependent positions and velocities of the ramp shock around the cowl lip. The displacements of the shock indicate sinusoidal oscillations with dominant frequency of 102.4 Hz, close to that obtained from unsteady pressure measurements. Phase trajectories of shock position based on image analyses indicate that the shock oscillations have limit cycle type oscillation, typical of nonlinear dynamic systems. Natural ventilation of the intake was found to be extremely effective in increasing the total pressure recovery, suppress buzz oscillations and in delaying the onset of buzz by preventing the upstream propagation of disturbances through passive bleeding of the internal boundary layer. Graphical abstract Effectiveness of natural ventilation in control of air-intake buzz at Mach 3.0
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    Topics: Computer Science
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  • 2
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    A posteriori accuracy estimation of ultrasonic vector-flow mapping (VFM) (2017)
    Springer
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    Publication Date: 2017-02-18
    Description: A novel method, called a posteriori “VFM accuracy estimation” (VAE), for resolving an intrinsic VFM problem is proposed. The problem is that VFM uncertainty can easily vary according to blood flows through an echocardiographic imaged plane (i.e., “through-plane” flows), and it is unknown. Knowing the VFM uncertainty for each patient will make it possible to refine the quality of VFM-based diagnosis. In the present study, VAE was derived on the basis of an error-propagation analysis and a statistical analysis. The accuracy of VAE with a pulsatile left-ventricle phantom was experimentally investigated for realistic cases with through-plane flows. VAE was validated by comparing VFM uncertainty (S.D.) estimated by VAE with VFM uncertainty measured by particle-image velocimetry (PIV) for different imaged planes. VAE accurately estimated the S.D. of VFM uncertainty measured by PIV for all cases with different image planes ( R  〉 0.6 and p  〈 0.001). These findings on VFM accuracy will provide the basis for widespread clinical application of VFM-based diagnosis. Graphical Abstract
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  • 3
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    Visual information communication and interaction (VINCI 2015) (2017)
    Springer
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    Publication Date: 2017-02-24
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  • 4
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    Compression-based integral curve data reuse framework for flow visualization (2017)
    Springer
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    Publication Date: 2017-05-21
    Description: Currently, by default, integral curves are repeatedly re-computed in different flow visualization applications, such as FTLE field computation, source-destination queries, etc., leading to unnecessary resource cost. We present a compression-based data reuse framework for integral curves, to greatly reduce their retrieval cost, especially in a resource-limited environment. In our design, a hierarchical and hybrid compression scheme is proposed to balance three objectives, including high compression ratio, controllable error, and low decompression cost. Specifically, we use and combine digitized curve sparse representation, floating-point data compression, and octree space partitioning to adaptively achieve the objectives. Results have shown that our data reuse framework could acquire tens of times acceleration in the resource-limited environment compared to on-the-fly particle tracing, and keep controllable information loss. Moreover, our method could provide fast integral curve retrieval for more complex data, such as unstructured mesh data. Graphical Abstract
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  • 5
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    Secondary flow visualization on stagnation row of a combined impingement and film cooled high-pressure gas turbine nozzle guide vane using PIV technique (2017)
    Springer
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    Publication Date: 2017-05-11
    Description: In this study, the local jet velocity distribution for a combined impingement and film cooled high-pressure nozzle guide vane system was analyzed, using flow visualization and PIV-assisted measurement. The measurements including flow visualization were performed on the stagnation row of an NGV to understand its complex flow pattern. PIV technique was used to measure the effused coolant jet exit velocity field in two-dimensional vertical planes. The computations were performed by ANSYS FLUENT 14.5 SOLVER using shear stress transport (SST) k-ω turbulence model. Three laboratory test cases that correspond to inlet coolant mass flow rates of 0.0032, 0.0045 and 0.0054 kg/s, at the region of an FIT, were studied. The numerical results for the spanwise coolant velocity at stagnation row of the film holes agreed well with the PIV experimental data on the same vane configuration. Graphical Abstract
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  • 6
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    Temporal and spatial flow structures in a simulated vessel with stenotic lesion using time-resolved PIV technique (2017)
    Springer
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    Publication Date: 2017-05-11
    Description: The stenotic geometry produces spatial and temporal regions such as high and low wall shear stress and flow separation. This disturbed blood flow in stenotic vessel can result in the further progress of atherogenesis. Therefore, the association between blood flow and geometrical factor need to be figured out by understanding the hemodynamic phenomena. The pulsatile flow features through a stenotic tube were investigated based on angiograms using a time-resolved particle image velocimetry (PIV) technique. A model of the tube core with stenosis was fabricated using a 3D printer, and the final tube model was fabricated with PDMS (polydimethylsiloxane). To prevent optical distortion, a mixture with glycerin and de-ionized water was used as the flow medium and a substitute for blood plasma. For PIV measurements, the concentration of fluorescence particles was controlled about 0.01 wt%. The flow rates were controlled using a circulating pump and silicon tubes from 1.6 to 3.7 mL/min. The pulsatile flow generates the local region of the maximum velocity at the post-stenosis and the shedding vortices move downstream over the time. The experiment indicates that such movements of vortices are quite different from the stagnant recirculation zone under the steady flow condition. With accumulating two-dimensional spatial flow fields obtained by phase averaging, the three-dimensional flow structure with the maximum velocity region was found to be a doughnut-shaped vortex ring. Graphical abstract
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  • 7
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    TieVis: visual analytics of evolution of interpersonal ties (2017)
    Springer
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    Publication Date: 2017-05-17
    Description: Interpersonal ties, such as strong ties and weak ties, describe the information carried by an edge in social network. Tracking the dynamic changes of interpersonal ties can thus enhance our understanding of the evolution of a complex network. Nevertheless, existing studies in dynamic network visualization mostly focus on the temporal changes of nodes or structures of the network without an adequate support of analysis and exploration of the temporal changes of interpersonal ties. In this paper, we introduce a new visual analytics method that enables interactive analysis and exploration of the dynamic changes of interpersonal ties. The method integrates four well-linked visualizations, including a scatterplot, a pixelbar chart, a layered graph, and a node–link diagram, to allow for multi-perspective analysis of the evolution of interpersonal ties. The scatterplot created by multi-dimensional scaling can help reveal the clusters of ties and detect abnormal ties, while other visualizations allow users to explore the clusters of ties interactively from different perspectives. Two case studies have been conducted to demonstrate the effectiveness of our approach. Graphical abstract
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  • 8
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    Visualization of flow field of a liquid ejector pump using embedded LES methodology (2017)
    Springer
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    Publication Date: 2017-04-25
    Description: The understanding of entrainment and mixing phenomenon in the ejector pump is of pivotal importance for designing and performance estimation. In this paper, the existence of turbulent vortical structures due to Kelvin–Helmholtz instability at the free surface between the motive and the entrained fluids streams is visualized using Embedded LES methodology. The efficacy of Embedded LES for simulation of complex flow field of ejector pump is evaluated using ANSYS Fluent ® 15.0. The enhanced mixing and entrainment process due to breaking down of larger eddies into smaller ones as a consequence of Vortex Stretching phenomenon is captured in this study. Moreover, the flow field characteristics of ejector pump like pressure and velocity fields are also analyzed and the results are validated against experimental results. Graphical abstract
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  • 9
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    Reconstructing flicker-free surfaces in hybrid particle-grid water simulation (2017)
    Springer
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    Publication Date: 2017-04-28
    Description: We present a new method for adaptively extracting flicker-free surfaces from time-varying nonuniform point-set data such as a hybrid particle–grid water simulation. When particles are irregularly distributed in hybrid simulations, degenerate triangles and holes may occur when constructing surfaces adaptively. These abnormal surfaces appear unexpectedly between frames, and we call them “flicker” artifacts (see Fig. 1). In this paper, we address this problem by developing: (1) a kernel-based octree technique to avoid degenerate triangles being created because of size discontinuities between adjacent leaf cells; (2) a level-set error compensation algorithm to avoid apertured water surfaces caused by some particles being lost in the triangulation process; and (3) the extraction of sufficient surface particles for efficient reconstruction of surfaces with extreme amounts of spatial adaptivity. Comparisons with previous methods convincingly demonstrate that our technique successfully reduced flicker artifacts. Graphical abstract
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  • 10
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    A corner-point-grid-based voxelization method for the complex geological structure model with folds (2017)
    Springer
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    Publication Date: 2017-05-07
    Description: The 3D voxel model is the foundation of geological property modeling, and it is also an effective approach to achieve the 3D visualization of heterogeneous attributes in geological structures. Corner-point grid is a representative structured grid model that is widely used nowadays. When implementing subdivision for the complex geological structure model with folds, its structural morphology and bedding features should be fully considered to ensure the generated voxels keep its original morphology. And on the basis of which, the detailed bedding features and the spatial heterogeneity of the internal attributes will be reproduced and expressed in the voxel model. For the purpose of overcoming the shortcomings of the existing technologies, a new corner-point-grid-based voxelization method is proposed which aims at the fast conversion from the 3D geological structure model with folds to its fine voxel model. As the rule of isocline in Ramsay’s fold classification is adopted in the gridding, the generated voxel model conforms to the spatial features of folds, and the voxels of the laminas inside a fold match the result of geological sedimentation and tectonic movement. This will provide a carrier and model foundation for the subsequent attribute assignment as well as the quantitative analysis and evaluation. Through the comparative analysis between the examples and Ramsay’s description of fold’s isoclines, the effectiveness and advantages of this method are discussed and tested. Graphical abstract
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