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Study on the onset and development of the three-dimensional separation around a diamond wing with incompressible flow solvers

机译：用不可压缩的流量解算器研究围绕金刚石翼的三维分离的发生和发展

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摘要

One of the challenges in simulating aerodynamic flows is the accurate prediction of onset and progression of separation. In earlier STO research, it was found that various predictions for three-dimensional airfoils at angle of attack showed different pitch moments due to differences in the predicted location of separation areas. Therefore, a diamond shaped wing was developed within the NATO STO AVT-183 research group, to isolate the blunt leading edge separation and understand the underlying physical mechanisms. In the present article, two viscous-flow solvers dedicated to hydrodynamic applications are used to predict the flow around the diamond wing. Both codes solve the incompressible flow using unstructured grids and finite volume discretization on the same grids. The results comprise a study of with/without peniche configurations and different turbulence models ranging from isotropic or anisotropic statistical turbulence closures to hybrid LES turbulence models. Moreover, the role played by the discretization error is assessed by using anisotropic automatic grid refinement procedures based on flow-related criteria. A detailed discussion is made, highlighting the similarities and differences of the results, the influence of modeling errors and showing the potential of CFD tools to predict the type of flow under consideration. (C) 2016 Elsevier Masson SAS. All rights reserved.
机译：模拟空气流动的挑战之一是准确预测分离的开始和进行。在早期的STO研究中，发现由于对分离区域的预测位置不同，对在迎角处的三维机翼的各种预测都显示出不同的俯仰力矩。因此，在北约STO AVT-183研究小组内部开发了菱形机翼，以隔离钝的前缘分离并了解潜在的物理机制。在本文中，两个专门用于流体动力应用的粘性流求解器用于预测钻石机翼周围的流量。两种代码都使用非结构化网格和相同网格上的有限体积离散化来解决不可压缩流。结果包括有/无peniche配置和不同湍流模型的研究，范围从各向同性或各向异性统计湍流闭合到混合LES湍流模型。此外，通过使用基于流量相关标准的各向异性自动网格细化程序来评估离散化误差所起的作用。进行了详细的讨论，突出了结果的异同，建模误差的影响并显示了CFD工具预测所考虑流量类型的潜力。 （C）2016 Elsevier Masson SAS。版权所有。

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