UNSTEADY SEPARATION FOR STOKES FLOWS IN 2-DIMENSIONS

Some simple solutions are presented to the unsteady Stokes flow equati ons which describe the development of the slow viscous flow due to a l ine rotlet. Four different geometries are considered, with the rotlet (a) in front of a plane wall, (b) inside a circular cylinder, (c) outs ide a circular cylinder, (d) between two parallel walls; also, the dev elopment is considered (i) after the impulsive introduction of a poten tial vortex, and (ii) after the impulsive introduction of a line sourc e of angular momentum. Separation occurs in all these situations, and one is able to trace the movement of the separation points, and the fo rmation of eddies, for different times. A number of distinctive physic al phenomena are detected.