科研之友
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摘要
Flow about the NASA trapezoidal wing is computed with several turbulence models by using grids from the first high-lift prediction workshop in an effort to advance understanding of computational fluid dynamics modeling for this type of flowfield. Transition is accounted for in many of the computations. In particular, a recently developed four-equation transition model is used and works well overall. Accounting for transition tends to increase lift and decrease moment, which improves agreement with the experiment. Upper surface flap separation is reduced, and agreement with experimental surface pressures and velocity profiles is improved. The predicted shape of wakes from upstream elements is strongly influenced by grid resolution in regions above the main and flap elements. Turbulence model enhancements to account for rotation and curvature have the general effect of increasing lift and improving the resolution of the wing-tip vortex as it convects downstream. However, none of the models improve the prediction of flap surface pressures near the wing tip.
- 出版日期2015-4
