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Flow visualization is the art of making flow patterns visible. Most fluids (air, water, etc.) are transparent, thus their flow patterns are invisible to the naked eye without methods to make them this visible. Historically, such methods included experimental methods.
Image-based flow visualization where a grid image is advected by the flow field. In scientific visualization, image-based flow visualization (or visualisation) is a computer modelling technique developed by Jarke van Wijk [1] to visualize two dimensional flows of liquids such as water and air, like the wind movement of a tornado.
The films were then developed and analyzed to obtain flow velocity information. These early PIV systems had limited spatial resolution and were labor-intensive, but they provided valuable insights into fluid flow behavior. The advent of lasers in the 1960s revolutionized the field of flow visualization and measurement.
Flow around a sphere being visualized by seeding the flow with smoke. Visualization of hairpin vortex structure, made visible by seeding the flow with colored dye. Seeding is a fundamental technique in fluid dynamics. It is used to visualize and measure fluid flow. Researchers introduce small particles, called seed particles, into a fluid.
Schlieren flow visualization of a Lockheed SR-71 Pratt & Whitney J58 engine inlet at Mach 2. Schlieren flow visualization is based on the deflection of light by a refractive index gradient [4] The index gradient is directly related to flow density gradient. The deflected light is compared to undeflected light at a viewing screen.
Sankey diagrams can also visualize the energy accounts, material flow accounts on a regional or national level, and cost breakdowns. [2] The diagrams are often used in the visualization of material flow analysis. Sankey diagrams emphasize the major transfers or flows within a system. They help locate the most important contributions to a flow.