"THREE-DIMENSIONAL VORTEX-SURFACE INTERACTIONS"
THE SEVENTH ASIAN CONFERENCE ON FLUID DYNAMICS DEC 8-12, 1997, MADRAS, INDIA
R Mahalingam, NM Komerath, RB Funk, JM Kim
ABSTRACT Vortex-surface interactions of various orientations and relative
scales occur in rotorcraft aerodynamics. Basic test cases at high Reynolds
number involving cylinders, airfoils and flat plates are used to study the
detailed collision processes. The surface pressure distribution is related
to the 3-dimensional nature of the vortex-core dynamics, with the core axial
velocity playing a crucial role. The phenomena during unsteady cylinder-vortex
interaction are summarized. Rapid, oblique vortex-lifting surface interaction
causes 3-D separation, alleviated by spanwise flow. Quasi-steady perpendicular
vortex/airfoil interaction shows vortex splitting and secondary separation,
but no recombination.