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首页> 外文期刊>Journal of Computational Physics >Application of strand meshes to complex aerodynamic flow fields
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Application of strand meshes to complex aerodynamic flow fields

机译：股线网格在复杂空气流场中的应用

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摘要

We explore a new approach for viscous computational fluid dynamics calculations for external aerodynamics around geometrically complex bodies that incorporates nearly automatic mesh generation and efficient flow solution methods. A prismatic-like grid using "strands" is grown a short distance from the body surface to capture the viscous boundary layer, and adaptive Cartesian grids are used throughout the rest of the domain. The approach presents several advantages over established methods: nearly automatic grid generation from triangular or quadrilateral surface tessellations, very low memory overhead, automatic mesh adaptivity for time-dependent problems, and fast and efficient solvers from structured data in both the strand and Cartesian grids. The approach is evaluated for complex geometries and flow fields. We investigate the effects of strand length and strand vector smoothing to understand the effects on computed solutions. Results of three applications using the strand-adaptive Cartesian approach are given, including a NACA wing, isolated V-22 (TRAM) rotor in hover, and the DLR-F6 wing-body transport. The results from these cases show that the strand approach can successfully resolve near-body and off-body features as well as or better than established methods.
机译：我们探索了围绕复杂几何体进行外部空气动力学的粘性计算流体动力学计算的新方法，该方法结合了几乎自动的网格生成和有效的流动求解方法。使用“钢绞线”的棱柱状网格在距身体表面不远的地方生长，以捕获粘性边界层，并且在整个域的其余部分都使用了自适应笛卡尔网格。该方法相对于已建立的方法具有几个优点：从三角形或四边形曲面细分中几乎自动生成网格，非常低的内存开销，针对时间相关问题的自动网格自适应性以及从链和笛卡尔网格中的结构化数据快速而有效的求解器。该方法针对复杂的几何形状和流场进行了评估。我们研究了钢绞线长度和钢绞线矢量平滑的影响，以了解对计算解的影响。给出了使用钢绞线自适应笛卡尔方法进行的三种应用的结果，包括NACA机翼，悬停的独立V-22（TRAM）旋翼以及DLR-F6机体运输。这些案例的结果表明，链方法可以成功解决近身和离体特征，甚至比已建立的方法更好。

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