Abstract
An investigation of the separated flow past an unswept wing (NACA-4415 airfoil) at high angle of attack (α = 18°) was carried out based on large-eddy simulations. As a first step a relatively low chord Reynolds number of Re c = 20, 000 was chosen yielding a leading-edge stall. The flow field in this range of α and Re c is dominated by asymmetric vortex shedding with a Strouhal number St′ ≈ 0.2. A strong vortex develops almost periodically in the vicinity of the trailing edge. The life cycle of this vortex structure is controlling the flow field. At the leeward side of the airfoil a large clockwise rotating recirculation region of nearly constant pressure exists. A periodically occurring shedding motion of this vortical structure into the wake is not observed. The entire flow field is very similar to the previously investigated flow past an inclined flat plate.
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References
Davidson, L.: LESFOIL: An European Project on Large Eddy Simulations Around a High-Lift Airfoil at High Reynolds Number, in: ECCOMAS 2000, European Cong. on Comp. Meth. in Appl. Sci. and Eng., Barcelona, Spain, 11–14 Sept., (2000).
Lerche, Th., Dallmann, U. Ch.: Das Prinzipexperiment COSTWING I: Dokumentation der Aufbauphase, Inst. f. Strömungsmech., DLR Göttingen, IB 223–99 A04, (1999).
Breuer, M., Rodi, W.: Large-Eddy Simulation of Complex Turbulent Flows of Practical Interest, In: Flow Simulation with High-Performance Computers II, Notes on Numerical Fluid Mechanics, vol. 52, pp. 258–274, Vieweg Verlag, (1996).
Breuer, M.: Large Eddy Simulation of the Sub-Critical Flow Past a Circular Cylinder: Numerical and Modeling Aspects, Int. J. for Num. Methods in Fluids, vol. 28, pp. 1281–1302, J. Wiley and Sons Ltd, Chichester, (1998).
Breuer, M.: A Challenging Test Case for Large Eddy Simulation: High Reynolds Number Circular Cylinder Flow, Int. J. of Heat and Fluid Flow, vol. 21, no. 5/6, Elsevier Science B.V., Amsterdam, (2000).
Breuer, M., Jovicic, N.: Separated Flow Around a Flat Plate at High Incidence: An LES Investigation,Second Int. Symposium on Turbulence and Shear Flow Phenomena, Stockholm, Sweden, June 27–29, (2001), to be publ. in J. of Turbulence.
Knisely, C.W., 1990, Strouhal Numbers of Rectangular Cylinders at Incidence: A Review and New Data, J. of Fluids and Structures, vol. 4, pp. 371–393, (1990).
Lam, K.M.: Phase-Locked Eduction of Vortex Shedding in Flow Past an Inclined Flat Plate, Phys. of Fluids, vol. 8 (5), pp. 1159–1168, (1996).
Perry A.E., Steiner, T.R.: Large-Scale Vortex Structures in Turbulent Wakes Behind Bluff Bodies, Part 1: Vortex Formation Process, J. Fluid Mech., vol. 174, pp. 233–270, (1987).
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Breuer, M., Jovičić, N. (2001). An LES Investigation of the Separated Flow Past an Airfoil at High Angle of Attack. In: Geurts, B.J., Friedrich, R., Métais, O. (eds) Direct and Large-Eddy Simulation IV. ERCOFTAC Series, vol 8. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1263-7_20
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DOI: https://doi.org/10.1007/978-94-017-1263-7_20
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-5893-5
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