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14-September-2008 12:50:33 - visualization Notepad To comply with 's quality standards, this article is in need of reorganization. There is good information here, but it is poorly organized. Please discuss this issue on the talk page and help improve this article. This article or section is written like a personal reflection or essay and may require cleanup. Please help improve it by rewriting it in an encyclopedic style. April 2008 This article has no lead section. To comply with 's lead section guidelines, one should be written. Please discuss this issue on the talk page and read the lead section guide to make sure the introduction summarizes the article. A model Cessna with helium-filled bubbles showing streamlines of the wingtip vortices. A model Cessna with helium-filled bubbles showing streamlines of the wingtip vortices. In fluid dynamics it is critically important to see the patterns produced by flowing fluids, in order to understand them. We can appreciate this on several levels: Most fluids air, water, etc. are transparent, thus their flow patterns are invisible to us without some special methods to make them visible. On another level, we know the governing equations of fluid motion the Navier-Stokes equations, but they are nonlinear partial differential equations with very few general solutions of practical utility. We can solve them numerically with modern computer methods, but these solutions may not correspond to nature unless verified by experimental results. On still another level the Navier-Stokes equations are pattern generators, and natural fluid flows display corresponding patterns that can recur on scales differing by many orders of magnitude. Such fluid patterns are familiar to almost everyone: the bathtub vortex and the tornado, the smoke ring and the mushroom cloud, the swinging of wires in the wind and the collapse of a historic bridge due to forced oscillations from vortex shedding. Flow visualization is the art of making these patterns visible. In experimental fluid dynamics, flows are visualized by three methods: surface flow visualization, particle tracer methods, and optical methods. Surface flow visualization reveals the flow streamlines in the limit as a solid surface is approached. Colored oil applied to the surface of a wind tunnel model provides one example the oil responds to the surface shear stress and forms a pattern. Particles, such as smoke, can be added to a flow to trace the fluid motion. We can illuminate the particles with a sheet of laser light in order to visualize a slice of a complicated fluid flow pattern. Assuming that the particles faithfully follow the streamlines of the flow, we can not only visualize the flow but also measure its velocity using a method known as particle image velocimetry. Finally, some flows reveal their patterns by way of changes in their optical refractive index. These are visualized by optical methods known as the shadowgraph, schlieren photography, and interferometry. In computational fluid dynamics the numerical solution of the governing equations can yield all the fluid properties in space and time. This overwhelming amount of information must be displayed in a meaningful form. Thus flow visualization is equally important in computational as in experimental fluid dynamics. See also Streamlines, streaklines and pathlines References Merzkirch, W., Flow visualization, New York:Academic Press, 1987. Van Dyke, M., An album of fluid motion, Stanford, CA:Parabolic Press, 1982. Samimy, M., Breuer, K. S., Leal, L. G., and Steen, P. H., A gallery of fluid motion, Cambridge University Press, 2004. Settles, G. S., Schlieren and shadowgraph techniques: Visualizing phenomena in transparent media, Berlin:Springer-Verlag, 2001. External links Flow visualization techniques. Flow visualization algorithms. Educational Particle Image Velocimetry e-PIV - resources and demonstrations v d e Visualization Fields Creative visualization · Chemical imaging · Crime mapping · Data visualization · Educational visualization · Flow visualization · Geovisualization · Information visualization · Medical imaging · Music visualization · Product visualization · Scientific visualization · Software visualization · Volume visualization Image types Chart · Computer graphics · Diagram · Graph of a function · Ideogram · Illustration · Information graphics · Map · Photograph · Pictogram · Statistical graphics · Table · Technical drawing Experts Jacques Bertin · Stuart Card · Thomas A. DeFanti · Michael Friendly · Nigel Holmes · Jock D. Mackinlay · Michael Maltz · Bruce H. McCormick · Charles Joseph Minard · Otto Neurath · William Playfair · Clifford A. Pickover · Arthur H. Robinson · Lawrence J. Rosenblum · Adolphe Quetelet · George G. Robertson · Ben Shneiderman · Edward Tufte Related topics Cartography · Computer graphics · Graph drawing · Graphic design · Imaging science · Information science · Mental visualisation · Neuroimaging · Spatial analysis · Visual analytics · Visual communication · Visual perception Retrieved from http://en..org/wiki/Flow_visualization Categories: articles needing reorganization | Fluid dynamics | AerodynamicsHidden categories: articles needing style ing from April 2008 | All articles needing style ing | introduction cleanup | All pages needing cleanup Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page This page was last modified on 25 June 2008, at 22:26
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