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The NASA Common Research Model: a Geometry-Handling Perspective

机译：NASA共同研究模型：几何处理的观点

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摘要

The NASA Common Research Model (CRM) was conceived specifically to support applied Computational Fluid Dynamics (CFD) validation activities. Primarily because of its use during the AIAA CFD Drag Prediction Workshops (DPW), it has become the one of the most widely studied airframes in the world. However, while much has been written on the subjects of mesh generation and the predicted flow solutions, very little has been published concerning the manner in which the NASA CRM Outer Mould Lines (OML) have been supplied, or of the associated geometric pre-processing requirements for surface or volume mesh generation. In view of the challenges posed by geometry-handling in the context of aerodynamic simulation in general and of the recognised importance of geometry and mesh generation to the NASA CFD Vision 2030, this paper is intended to help address this gap in the literature. One of the geometry models supplied for DPW 4 - an open test case, familiar to many in the international community - is used to illustrate some of the difficulties that may be encountered when producing CFD-ready OML. By reviewing some of the underlying geometric principles, the material presented identifies some general challenges concerning not only the format, but also the form in which airframe OML should be defined for use with CFD.
机译：NASA通用研究模型（CRM）专门用于支持应用的计算流体动力学（CFD）验证活动。主要是由于在AIAA CFD阻力预测研讨会（DPW）中使用了它，它已成为世界上研究最广泛的机身之一。但是，尽管已经针对网格生成和预测的流动解决方案撰写了大量文章，但有关提供NASA CRM外模线（OML）的方式或相关的几何预处理的文献很少发表。生成曲面或体积网格的要求。鉴于一般在空气动力学模拟的背景下几何处理带来的挑战以及公认的几何形状和网格生成对NASA CFD Vision 2030的重要性，本文旨在帮助解决文献中的这一空白。 DPW 4提供的一种几何模型-一个开放的测试案例，国际上很多人都熟悉-用于说明在生产CFD就绪的OML时可能遇到的一些困难。通过回顾一些基本的几何原理，所提供的材料不仅确定了格式，而且还定义了用于CFD的机身OML的定义形式所面临的一般性挑战。

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