Filters








1,069,982 Hits in 5.7 sec

A finite element based level set method for two-phase incompressible flows

Sven Groß, Volker Reichelt, Arnold Reusken
2006 Computing and Visualization in Science  
We present a method that has been developed for the efficient numerical simulation of two-phase incompressible flows. For capturing the interface between the flows the level set technique is applied.  ...  For reparametrization of the level set function a new variant of the Fast Marching method is introduced.  ...  The first experiment shows the effect of the reparametrization and the smoothing of the level set function. For better visualization only 2D results are presented.  ... 
doi:10.1007/s00791-006-0024-y fatcat:sgnphnwsz5f3fida3n6sybxuwa

A level-set method for flow visualization

R. Westermann, C. Johnson, T. Ertl
Proceedings Visualization 2000. VIS 2000 (Cat. No.00CH37145)  
Abstract In this paper we propose a technique for visualizing steady flow. Using this technique, we first convert the vector field data into a scalar level-set representation.  ...  Next, we combine geometrical and topological considerations to derive a multiscale representation and to implement a method for the automatic placement of a sparse set of graphical primitives depicting  ...  We would like to thank NASA for providing the ocean data set. This work was supported, in part, by grants from NSF, NIH, and DOE.  ... 
doi:10.1109/visual.2000.885688 dblp:conf/visualization/WestermannJE00 fatcat:z3w46itojnbctfeby3itgwteie

Particle Level Set Advection for the Interactive Visualization of Unsteady 3D Flow

Nicolas Cuntz, Andreas Kolb, Robert Strzodka, Daniel Weiskopf
2008 Computer graphics forum (Print)  
Typically, flow volumes are visualized by defining their boundary as iso-surface of a level set function.  ...  Grid-based level sets offer a good global representation but suffer from numerical diffusion of surface detail, whereas particlebased methods preserve details more accurately but introduce the problem  ...  For an overview of texture-based flow visualization in general, we refer to Laramee et al. [LHD * 04]. Generic level set methods are often applied in the field of visualization and image processing.  ... 
doi:10.1111/j.1467-8659.2008.01200.x fatcat:ccl6w736jnhdpeunoy7w3o5o3i

Methods for interactive visualization of large flow data sets

Willem C. de Leeuw, Robert van Liere, Robert F. Erbacher, Philip C. Chen, Jonathan C. Roberts, Craig M. Wittenbrink
2000 Visual Data Exploration and Analysis VII  
Effective visualization methods are needed for the analysis of these large data sets. For example, consider figure 5.  ...  Visualization methods should be able to cope with these different levels of scale. Advanced Visualization Techniques There is no natural visual representation for 3D vector fields.  ... 
doi:10.1117/12.378903 fatcat:tzta76vrkrdbfpn7gsin4f2rre

Dye Advection Without the Blur: A Level-Set Approach for Texture-Based Visualization of Unsteady Flow

D. Weiskopf
2004 Computer graphics forum (Print)  
The level-set evolution is governed by the underlying flow field and is computed by a semi-Lagrangian method.  ...  This approach works for 2D and 3D flow fields alike.  ...  Acknowledgments The author would like to thank the anonymous reviewers for helpful remarks to improve the paper. Special thanks to Bettina Salzer for proof-reading.  ... 
doi:10.1111/j.1467-8659.2004.00779.x fatcat:5y5flwxrxvfdhkfsd4yqlhoyae

Comparative flow visualization

Vivek Verma, A. Pang
2004 IEEE Transactions on Visualization and Computer Graphics  
There is therefore a need for comparative visualization tools to help analyze the differences. This paper focuses on comparative visualization tools for analyzing flow or vector data sets.  ...  These comparison methods can also be used to study differences in vortex cores that are represented as polylines.  ...  data set, Carol Mullane for proof reading, and the anonymous reviewers for their comments and suggestions.  ... 
doi:10.1109/tvcg.2004.39 pmid:15527044 fatcat:eqkh6edqvzamnmwju6fq3ussje

Visualization of exception handling constructs to support program understanding

Hina Shah, Carsten Görg, Mary Jean Harrold
2008 Proceedings of the 4th ACM symposium on Software visuallization - SoftVis '08  
method level.  ...  The paper also presents a case study in which we evaluated a prototype of the visualization system on a small set of developers.  ...  The participants in our survey provided valuable information that improved our visualizations. The anonymous reviewers gave helpful comments on an earlier version of this paper.  ... 
doi:10.1145/1409720.1409724 dblp:conf/softvis/ShahGH08 fatcat:2mz5cjav6jdo3fhfvlvs4admmy

Comparison of methods for flow border detection in images of smoke visualization

Petr Caletka, Ondrej Pech, Jan Jedelsky, Frantisek Lizal, Miroslav Jicha, P. Dančová, M. Veselý
2016 EPJ Web of Conferences  
A separation of the flow region from the surroundings is an essential step in the analysis of smoke visualization images.  ...  Three representative images of different quality levels were selected for the detection, and three methods were used for the evaluation.  ...  The authors also gratefully acknowledge the support from the "Josef Bozek Competence Centre for Automotive Industry", number TE01020020 of the Technology agency of the Czech Republic.  ... 
doi:10.1051/epjconf/201611402009 fatcat:ctetio2r6rdglhzanw6c3tf4ca

Visualizing the path of blood flow in static vessel images for image guided surgery of cerebral arteriovenous malformations

Sean Jy-Shyang Chen, Marta Kersten-Oertel, Simon Drouin, D. Louis Collins, David R. Holmes III, Kenneth H. Wong
2012 Medical Imaging 2012: Image-Guided Procedures, Robotic Interventions, and Modeling  
In this work, we describe our methods for processing static preoperative angiographic images in order to effectively visualize the feeding and draining vessels of an AVM nidus.  ...  Maps from level-set front propagation processing of the vessel images are used to label the vessels by colour. Furthermore, images are decluttered using the topological distances between vessels.  ...  Kelvin Mok for making the image data available for our use and Dr. David Sinclair for his suggestions in developing the visualization method.  ... 
doi:10.1117/12.911684 dblp:conf/miigp/ChenKDC12 fatcat:uv2c7ooohzcd7kchlciccuomwi

Modeling Deformable Surfaces with Level Sets

R. Whitaker
2004 IEEE Computer Graphics and Applications  
The GPU algorithm in Lefohn et al. 2 includes a narrow-band method that is augmented with an additional level-set flow to maintain a clamped distance transform as the level set evolves.  ...  Figure 1b depicts a geometric interpretation of the level-set method for a 1D function F. The level sets of a 1D scalar function are points, given the intersection of the k line with F.  ... 
doi:10.1109/mcg.2004.34 pmid:15628093 fatcat:tjob34qk5fdavlgas3z35kskrq

Flow Mapping and Multivariate Visualization of Large Spatial Interaction Data

Diansheng Guo
2009 IEEE Transactions on Visualization and Computer Graphics  
can construct a hierarchy of geographical regions (communities), where there are more flows or connections within regions than across regions; (2) a multivariate clustering and visualization method to  ...  Moreover, many variables are associated with each flow, such as the number of migrants for different age groups, income levels, and occupations.  ...  ., a more effective regionalization method) for deriving natural regions according to flows and the integration of a suite of methods for the analysis and visualization of massive spatial interaction data  ... 
doi:10.1109/tvcg.2009.143 pmid:19834170 fatcat:eu36l77ckjaajj5ufgdrbwl6re

Ergodic theory and experimental visualization of invariant sets in chaotically advected flows

Igor Mezić, Fotis Sotiropoulos
2002 Physics of Fluids  
We analyze a recently proposed experimental technique for constructing Poincaré maps in flows exhibiting chaotic advection and develop the theoretical framework that explains the reasons for the success  ...  The invariant sets of the flow are visualized by time-averaging the instantaneous images and plotting iso-contours of the so resulting mean light intensity field.  ...  Sotiropoulos et al. 15 recently proposed a simple experimental technique for visualizing invariant sets in steady, three-dimensional flows.  ... 
doi:10.1063/1.1480266 fatcat:a3j7jxufbvbrzprs5cross75ay

Similarity Measures for Enhancing Interactive Streamline Seeding

T. McLoughlin, M. W. Jones, R. S. Laramee, R. Malki, I. Masters, C. D. Hansen
2013 IEEE Transactions on Visualization and Computer Graphics  
We show that this method preserves the overall flow behavior while using only a small subset of the original streamline set.  ...  We introduce the novel idea of computing streamline signatures based on a set of curve-based attributes. A signature produces a compact representation for describing a streamline.  ...  In many cases, this does not result in a visually optimal set of streamlines for the given seeding object.  ... 
doi:10.1109/tvcg.2012.150 pmid:23744264 fatcat:mq7vavr56fchzg6qnb4hednnqi

Parallel hierarchical visualization of large time-varying 3D vector fields

Hongfeng Yu, Chaoli Wang, Kwan-Liu Ma
2007 Proceedings of the 2007 ACM/IEEE conference on Supercomputing - SC '07  
We present the design of a scalable parallel pathline construction method for visualizing large time-varying 3D vector fields.  ...  We demonstrate the performance of parallel pathline visualization using data sets obtained from terascale flow simulations.  ...  We wish to thank the anonymous reviewers for their constructive comments, and the Cray XT3 time provided by the Pittsburgh Supercomputing Center.  ... 
doi:10.1145/1362622.1362655 dblp:conf/sc/YuWM07 fatcat:qfasgixwzveixhdoimxw6zh7zy

Visualization of Through-Plane Blood Flow Measurements Obtained from Phase-Contrast MRI

Per Thunberg, Anders Kähäri
2010 Journal of digital imaging  
The purpose of this work was to develop a visualization method for concurrent observation of both velocity and magnitude data obtained from through-plane velocity measurements using phase-contrast magnetic  ...  Results are shown where the method is used to visualize blood flow measurements in the ascending aorta and the aortic valve.  ...  The authors gratefully acknowledge Terence Kearey for the constructive comments on the text.  ... 
doi:10.1007/s10278-010-9286-5 pmid:20358243 pmcid:PMC3092048 fatcat:fqeqdrz54jaa3ot42fol67fqki
« Previous Showing results 1 — 15 out of 1,069,982 results