Navier-Stokes Computations of Transition to Turbulent Flow Around Airfoils 901808
Numerical solutions of the Reynolds-averaged Navier-Stokes equations were obtained with the two-equation K-ϵ turbulence model. Considering the low-Reynolds-number effect in the closed vicinity of a solid boundary, a stream function and vorticity method was developed to consider both the laminar and turbulent stresses throughout the two-dimensional, incompressible flowfield of any arbitrary geometry. At a low Reynolds number (Re = 30), the initially imposed disturbances around an airfoil are damped out; the flow is laminar. At a moderately high Reynolds number (Re = 1000), instability of laminar flow is obtained by exhibiting cyclic patterns in the stream function and vorticity distributions. Nevertheless, only laminar stress occurs in the entire flowfield. At a higher Reynolds number (Re = 106), turbulent stress, which is about three orders of magnitude larger than the laminar stress, occurs at a certain distance downstream of the leading edge and in the wake region. The location, where the turbulent stress begins to increase is considered as the point of transition.
Citation: Lee, S. and Chen, C., "Navier-Stokes Computations of Transition to Turbulent Flow Around Airfoils," SAE Technical Paper 901808, 1990, https://doi.org/10.4271/901808. Download Citation
Author(s):
Shen C. Lee, Chang R. Chen
Affiliated:
University of Missouri-Rolla
Pages: 12
Event:
Aerospace Technology Conference and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Turbulence
Wind tunnel tests
Wings
SAE MOBILUS
Subscribers can view annotate, and download all of SAE's content.
Learn More »