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Investigation of Three-Dimensional Dynamic Stall Using Computational Fluid Dynamics

Spentzos, A. and Barakos, G. and Badcock, K. and Richards, B. and Wernert, P. and Schreck, S. and Raffel, M. (2005) Investigation of Three-Dimensional Dynamic Stall Using Computational Fluid Dynamics. AIAA Journal, 43 (5), pp. 1023-1033.

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Abstract

Numerical simulation of three-dimensional dynamic stall has been undertaken using computational fluid dynamics. The full Navier–Stokes equations, coupled with a two-equation turbulence model, where appropriate, have been solved on multiblock strucured grids in a time-accurate fashion. Results have neen 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 of 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. During the ramping of the wing, the two vortices grow significantly in size. The dynamic stall vortex dettaches from the wing in the inboard region but remains close to the wing’s leading edge near the tip. The overall configuration of the developed vortical system takes a form. To our knowledge, this is the first detailed numerical study of three-dimensional dynamic stall appearing in the literature.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2005,
Title:Investigation of Three-Dimensional Dynamic Stall Using Computational Fluid Dynamics
Authors:
AuthorsInstitution or Email of Authors
Spentzos, A.University of Glasgow, Glasgow/UK
Barakos, G.University of Glasgow, Glasgow/UK
Badcock, K.University of Glasgow, Glasgow/UK
Richards, B.University of Glasgow, Glasgow/UK
Wernert, P.ISL Saint-Louis/France
Schreck, S.National Renewable Energy Laboratory, Golden, Colorado/USA
Raffel, M.UNSPECIFIED
Date:2005
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:43
Page Range:pp. 1023-1033
Status:Published
Keywords:Three-Dimensional Dynamic Stall, Computational Fluid Dynamics, Pitching Airfoil, Tipp Vortex
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: elib DLR-Beauftragter
Deposited On:11 Jul 2007
Last Modified:14 Jan 2010 19:53

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