Crossflow topology of vortical flows

Abstract

Introduction F LOWS past delta wings and slender bodies of revolution at angle of attack are of obvious importance in aerodynamics. These flows are characterized by the formation of stream wise vortical structures on the leeside of the body. In experimental as well as computational studies, the vortical flow structure is often examined on transverse planes normal to the body axis. On such planes, the projected or sectional streamline pattern typically exhibits crossflow separation. The purpose of this Note is to demonstrate using critical-point theory and computational results for delta wing flows' that a number of distinct topologies of crossflow separation are possible. In addition, the present results confirm and extend recent experimental findings' for the instantaneous crossflow topology on pitching delta wings.