Numerical simulation of three-dimensional dynamic stall has been undertaken using computational fluid dynamics. The full Navier-Stokes equation, coupled with a two-equation turbulence model, where appropriate, have been solved on multiblock structured grids in a time-accurate fashion. Results have been obtained for wings of square planform and of NACA 0012 section. Efforts have been devoted to the accurate modeling of the flow near the wing tips, which, for this case, were sharp without tip caps. The obtained results revealed the time evolution or the dynamic stall vortex, which, for this case, takes the shape of a capital omega spanning the wing. The obtained results compare well against experimental data both for the surface pressure distribution on the wing and the flow topology. Of significant importance is the interaction between the three-dimensional dynamic stall vortex and the tip vortex. The present results indicate that once the two vortices are formed both appear to originate from the same region, which is located near the leading edge of the tip. The overall configuration or the developed vortical system takes a Pi-Omega form. To the authors' knowledge, this is the first detailed numerical study of three-dimensional dynamic stall appearing in the literature.
Investigation of three-dimensional dynamic stall using computational fluid dynamics
Numerische Untersuchung des dreidimensionalen dynamischen Strömungsabrisses an Tragflächen
AIAA Journal ; 43 , 5 ; 1023-1033
2005
11 Seiten, 8 Bilder, 2 Tabellen, 31 Quellen
Article (Journal)
English
FLUID DYNAMICS - Investigation of Three-Dimensional Dynamic Stall Using Computational Fluid Dynamics
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