  The aerodynamic performance of the high-lift configuration greatly influences
the safety and economy of commercial aircraft. Accurately predicting the
aerodynamic performance of the high-lift configuration, especially the stall
behavior, is important for aircraft design. However, the complex flow phenomena
of high-lift configurations pose substantial difficulties to current turbulence
models. In this paper, a three-equation k-(v^2)-{\omega} turbulence model for
the Reynolds-averaged Navier-Stokes equations is used to compute the stall
behavior of high-lift configurations. A separated shear layer fixed function is
implemented in the turbulence model to better capture the nonequilibrium
characteristics of turbulence. Different high-lift configurations, including
the two-dimensional multielement NLR7301 and Omar airfoils and a complex
full-configuration model (JAXA Standard Model), are numerically tested. The
results indicate that the effect of the nonequilibrium characteristics of
turbulence is significant in the free shear layer, which is key to accurately
predicting the stall behavior of high-lift devices. The modified SPF k-(v^2
)-{\omega} model is more accurate in predicting stall behavior than the
Spalart-Allmaras, shear stress transport, and original k-(v^2)-{\omega} models
for the full high-lift configuration. The relative errors in the predicted
maximum lift coefficients are within 3% of the experimental data.
