TRANSITION FROM LAMINAR TO TURBULENT FLOW

The motions of real fluids exhibit phenomena of a bewildering degree of diversity. The pressure distribution and the resultant force and moment on a body moving through a fluid are but grosser manifestations of complex motions of the fluid in the surrounding space. The body is surrounded by a flow field in which the velocity and pressure vary. There is no single theory adequate to describe this flow field in its entirety. Progress can be made only by recognizing characteristic phenomena in limited regions of complex flow fields that can be reproduced and studied in a simpler experimental environment. Transition