Numerical investigation of transonic limit cycle oscillations of a two-dimensional supercritical wing

Sie sind hier: Homepage > Suche

Numerical investigation of transonic limit cycle oscillations of a two-dimensional supercritical wing

Tang, L. / Bartels, R.E. / Chen, P.C. / Liu, D.D.

CFD-based aeroelastic computations are performed to investigate the effect of nonlinear aerodynamics on transonic limit cycle oscillation (LCO) characteristics of the NLR7301 airfoil section. It is found that the LCO solutions from Navier-Stokes computations deviate less from the experiment than an Euler solution but strongly depend on the employed turbulence model. The Degani-Schiff modification to the Baldwin-Lomax turbulence model provokes spurious vorticity spots causing multiple shocks which might be unphysical, while the Spalart-Alimaras turbulence model yields physically reasonable unsteady shocks. In the cases examined, smaller initial perturbations lead to larger LCO amplitudes and vice versa, in contradiction to what one might expect. The amplitude of the initial perturbation is also found to have an impact on the mean position of LCO. Also addressed in the paper are aspects of multiblock message passing interface (MPI) parallel computation techniques as related to the present problem.