Low Frequency Oscillation of Laminar Separation Bubble Near Stall-Discussion on Turbulent Energy Production-

Abstract

A laminar separation bubble formed on a NACA 0012 airfoil at a chord Reynolds number of 1.3×10⁵ has been investigated to discuss the bubble behavior near stall. The flow is oscillating between a small separation-reattachment bubble formed near the leading-edge and a large separated region extending over the airfoil surface at a frequency of about 2Hz. Phase averaged turbulent energy production term have been obtained. Results indicate that the behavior of growth and decay of the phase averaged turbulent stress has strong correlation with the behavior of the phase averaged turbulent energy production.