The Water Tunnel at NASA's Dryden Flight Research Center, Edwards, CA, became operational in 1983 when Dryden was a
Flight Research Facility under the management of the Ames Research Center in Mountain View, CA. As a medium for visualizing fluid flow, water has played a significant role. Its use dates back to Leonardo da Vinci (1452-1519), the Renaissance Italian engineer, architect, painter, and sculptor. In more recent times, water tunnels have assisted the study of complex flows and flow-field interactions on aircraft shapes that generate strong vortex flows. Flow visualization in water tunnels assists in determining the strength of vortices, their location, and possible methods of controlling them.
The design of the Dryden Water Tunnel imitated that of the Northrop Corporation's tunnel in Hawthorne, CA. Called the Flow Visualization Facility, the Dryden tunnel was built to assist researchers in understanding the aerodynamics of aircraft configured
in such a way that they create strong vortex flows, particularly at high angles of attack. The tunnel provides results that
compare well with data from aircraft in actual flight in another fluid-air. Other uses of the tunnel have included study of how
such flight hardware as antennas, probes, pylons, parachutes, and experimental fixtures affect airflow. The facility has also
been helpful in finding the best locations for emitting smoke from flight vehicles for flow visualization.
