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NSU3D Results for the Second AIAA High Lift Prediction Workshop

机译:NSU3D第二届AIAA高升程预测研讨会的结果

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Simulation results for the second AIAA CFD High Lift Prediction Workshop using the unstructured computational fluid dynamics code NSU3D are presented. The solution algorithms employed in NSU3D for this study are described along with examples of convergence history and computational cost. The geometry used for the simulation consists of the DLR-F11 wing-body with high-lift system deployed in a landing configuration. This geometry is representative of a modern transport aircraft high-lift system that has been tested experimentally over a suitable Reynolds number range. Results are presented from two sets of computational studies, the first performed at the University of Wyoming using standard workshop unstructured meshes, and the second performed at Bombardier Aerospace using in-house generated meshes. In both cases, results are presented for two different turbulence models, allowing an assessment of the sensitivity of the results to grid densities, grid types, and turbulence models. Results consist of computed force and moment coefficients across a range of angles of attack and for two different Reynolds numbers, as well as surface pressure profiles and off-body velocity profiles, all of which are compared with experimental data. The results compare favorably with experimental data and generally fall within the standard deviation of the workshop collective results. Computations using the Spalart-Allmaras turbulence model tend to overpredict the maximum lift value and incidence, while results using the k-omega model tend to underpredict the maximum lift value. The best agreement in terms of force coefficients is observed with the k-omega turbulence model using the Bombardier internally generated meshes.
机译:给出了使用非结构化计算流体动力学代码NSU3D的第二个AIAA CFD高升程预测车间的仿真结果。本文介绍了NSU3D中用于本研究的解决方案算法,以及收敛历史和计算成本的示例。用于仿真的几何图形由DLR-F11机翼主体组成,该机翼主体具有高降落系统,并部署在着陆配置中。这种几何形状代表了现代运输飞机的高升力系统,该系统已在合适的雷诺数范围内进行了实验测试。结果来自两组计算研究,第一组在怀俄明大学使用标准车间非结构化网格进行,第二组在庞巴迪宇航公司使用内部生成的网格进行。在这两种情况下,都针对两种不同的湍流模型给出了结果,从而可以评估结果对网格密度,网格类型和湍流模型的敏感性。结果由计算得出的力和力矩系数在一定的攻角范围内以及两个不同的雷诺数,以及表面压力曲线和离体速度曲线组成,所有这些都与实验数据进行了比较。结果与实验数据相比具有优势,并且通常在车间总体结果的标准偏差之内。使用Spalart-Allmaras湍流模型的计算往往会高估最大升力值和入射角,而使用k-omega模型的结果则会低估最大升力值。使用庞巴迪内部生成的网格,在k-ω湍流模型中观察到了关于力系数的最佳一致性。

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