IEEE Trans Vis Comput Graph - Physically-Based Interactive Flow Visualization Based on Schlieren and Interferometry Experimental Techniques.

Tópicos

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{ blood(1257) pressur(1144) flow(957) }
{ visual(1396) interact(850) tool(830) }
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{ sampl(1606) size(1419) use(1276) }
{ data(3963) clinic(1234) research(1004) }
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{ featur(1941) imag(1645) propos(1176) }
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{ inform(2794) health(2639) internet(1427) }
{ imag(2830) propos(1344) filter(1198) }
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Resumo

Understanding fluid flow is a difficult problem and of increasing importance as computational fluid dynamics produces an abundance of simulation data. Experimental flow analysis has employed techniques such as shadowgraph, interferometry and schlieren imaging for centuries which allow empirical observation of inhomogeneous flows. Shadowgraphs provide an intuitive way of looking at small changes in flow dynamics through caustic effects while schlieren cutoffs introduce an intensity gradation for observing large scale directional changes in the flow. Interferometry tracks changes in phase-shift resulting in bands appearing. The combination of these shading effects provides an informative global analysis of overall fluid flow. Computational solutions for these methods have proven too complex until recently due to the fundamental physical interaction of light refracting through the flow field. In this paper, we introduce a novel method to simulate the refraction of light to generate synthetic shadowgraph, schlieren and interferometry images of time-varying scalar fields derived from computational fluid dynamics (CFD) data. Our method computes physically accurate schlieren and shadowgraph images at interactive rates by utilizing a combination of GPGPU programming, acceleration methods, and data- dependent probabilistic schlieren cutoffs. Applications of our method to multi-field data and custom application-dependent color filter creation are explored. Results comparing this method to previous schlieren approximations are finally presented.

Resumo Limpo

understand fluid flow difficult problem increas import comput fluid dynam produc abund simul data experiment flow analysi employ techniqu shadowgraph interferometri schlieren imag centuri allow empir observ inhomogen flow shadowgraph provid intuit way look small chang flow dynam caustic effect schlieren cutoff introduc intens gradat observ larg scale direct chang flow interferometri track chang phaseshift result band appear combin shade effect provid inform global analysi overal fluid flow comput solut method proven complex recent due fundament physic interact light refract flow field paper introduc novel method simul refract light generat synthet shadowgraph schlieren interferometri imag timevari scalar field deriv comput fluid dynam cfd data method comput physic accur schlieren shadowgraph imag interact rate util combin gpgpu program acceler method data depend probabilist schlieren cutoff applic method multifield data custom applicationdepend color filter creation explor result compar method previous schlieren approxim final present

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