Fluid+flow

Fluid flow

[|Underwater Robots] - The stingray's method of flying through the water could help us design a whole new class of bio-inspired 'bots. The rays' flapping glide could make for more efficient and agile underwater robots and submarines. In order to investigate why these flat fish move so strangely—"like a flag in the wind," —the researchers mapped the fluid flows that occur around a stingray as it swims. They looked at the leading-edge vortex, the vortex in front of a moving object that helps birds and insects fly through the air. Their model shows that stingrays move through the water with the help of vortices that create a low pressure field in front of it, and high pressure near its back end. This moves the fish forward without it having to expend much energy.

[|everyday examples]
 * Kinematics of Fluid Motion 	Cream in Coffee, BMW Convertible, Air Conditioning, Bathroom Ventilation
 * Dynamics of Fluid Motion 	Floating Table Tennis Ball, Hurricanes, Hand Out of Car Window, Vacuum Cleaner
 * Viscous Flow in Pipes (Internal Flow) 	Vacuum Cleaner, Water Squirter, Bicycle Pump
 * Flow Over Bodies (External Flow) 	Swim Suits, Heart Surgery, Pizza Delivery
 * Flow in Open Channels 	Water Slide, Curb Drain, Drainage Ditch
 * Compressible Flow 	Rampaging Bull, Flock of Sheep, Supersonic Flight, Factory Explosion


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