Instantaneous critical point in unsteady flow
Abstract
A similarity transformation is used to transform the unsteady pathline equation into an autonomous system. By studying the autonomous system, the applicability of the idea of an 'instantaneous critical point' to an unsteady flow is discussed. It is proved that in the neighborhood where separation occurs, the pathline equation may be locally autonomous in the physical plane, to the first order.
 Publication:

Acta Aerodynamica Sinica
 Pub Date:
 March 1988
 Bibcode:
 1988AcAer...6...45W
 Keywords:

 Boundary Layer Separation;
 Critical Point;
 Separated Flow;
 Unsteady Flow;
 NavierStokes Equation;
 Transformations (Mathematics);
 Vector Analysis;
 Fluid Mechanics and Heat Transfer