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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.
Flow visualization techniques use seeding to make fluid flows visible. These techniques include methods like dye injection, smoke seeding, or the use of reflective particles. These techniques help researchers observe and analyze flow patterns, vortices, and other fluid behaviors in both experimental and educational settings.
A spaghetti plot (also known as a spaghetti chart, spaghetti diagram, or spaghetti model) is a method of viewing data to visualize possible flows through systems.Flows depicted in this manner appear like noodles, hence the coining of this term. [1]
A flow that is not a function of time is called steady flow. Steady-state flow refers to the condition where the fluid properties at a point in the system do not change over time. Time dependent flow is known as unsteady (also called transient [8]). Whether a particular flow is steady or unsteady, can depend on the chosen frame of reference.
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. Compared with ...
Schlieren photography is a process for photographing fluid flow. Invented by the German physicist August Toepler in 1864 to study supersonic motion, it is widely used in aeronautical engineering to photograph the flow of air around objects.
Particle image velocimetry (PIV) is a non-intrusive optical flow measurement technique used to study fluid flow patterns and velocities. PIV has found widespread applications in various fields of science and engineering, including aerodynamics, combustion, oceanography, and biofluids. The development of PIV can be traced back to the early 20th ...
Shadowgraph is a type of flow visualisation. In principle, a difference in temperature, a different gas, or a shock wave in the transparent air cannot be seen by the human eye or cameras. However, all these disturbances refract light rays, so they can cast shadows.