Simulation of dynamic stall phenomenon using unsteady Navier-Stokes equations

✍ Scribed by G.A. Osswald; K.N. Ghia; U. Ghia

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 666 KB
• Volume: 65
• Category: Article
• ISSN: 0010-4655
• DOI: 10.1016/0010-4655(91)90173-i

✦ Synopsis

A non-inertial body-fixed generalized coordinate frame is employed to develop an unsteady Navier-Stokes (NS) analysis for arbitrarily maneuvering bodies. A fully implicit direct numerical simulation (DNS) methodology is implemented for the solution of the governing equations. A velocity-vorticity (disturbance stream function -vorticity in 2-D) formulation is shown to simplify both the theoretical and numerical analysis of maneuvering flight when compared with the primitive-variable formulation. The resulting numerical method is highly vectorizable and currently achieves a computational index of 6 micro-seconds per time step per mesh point using a single processor on the CRAY Y-MP 8/864 at the Ohio Supercomputer Center. Vectorization has been achieved satisfactorily, with the code currently performing in the range of 130-180 Mflops. The rapid pitch-up maneuver of a NACA 0015 airfoil is examined at Re =1000 and Re = 10000, with particular emphasis being placed on the development and evolution of the dynamic stall vortex.