A Quantitative Approach for the Accurate CFD Simulation of Hover in Turbulent Flow

IF 1.4 4区工程技术 Q2 ENGINEERING, AEROSPACE

Journal of the American Helicopter Society Pub Date : 2023-01-01 DOI:10.4050/jahs.68.042009

N. Chaderjian

引用次数: 0

Abstract

Time-dependent Navier–Stokes simulations have been carried out for a V22 rotor in hover using an improved, low-dissipation, HLLE++ upwind algorithm in the OVERFLOW code. Emphasis is placed on lessons learned over the past decade regarding the effects of high-order spatial accuracy, grid resolution, and the use of detached eddy simulation in predicting the figure-of-merit, the rotor's chief performance parameter. A general quick-start procedure is described together with a statistical measure of FM convergence that reduces hover computations by fourfold, similar to computational work for forward flight. Cartesian adaptive mesh refinement is used to resolve the tip–vortex to its correct physical size. This adaptive mesh refinement in the rotor wake also revealed a complex turbulent flow with worm-like structures of various scales. These structures were numerically found a decade ago and recently observed in experiment.

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湍流中悬停精确CFD模拟的定量方法

利用一种改进的、低耗散的、hlle++逆风算法，在OVERFLOW代码中对V22旋翼进行了时变Navier-Stokes仿真。重点放在过去十年中关于高阶空间精度，网格分辨率的影响的经验教训，以及在预测转子的主要性能参数-性能值时使用分离涡模拟。描述了一个通用的快速启动程序以及FM收敛的统计度量，它将悬停计算减少了四分之一，类似于前飞的计算工作。采用笛卡儿自适应网格细化将尖涡分解为正确的物理尺寸。旋翼尾迹的自适应网格细化也揭示了具有不同尺度的蠕虫状结构的复杂湍流。这些结构是十年前用数值方法发现的，最近才在实验中观察到。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the American Helicopter Society 工程技术-工程：宇航

CiteScore

4.10

自引率

33.30%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of the American Helicopter Society is a peer-reviewed technical journal published quarterly (January, April, July and October) by AHS — The Vertical Flight Society. It is the world''s only scientific journal dedicated to vertical flight technology and is available in print and online. The Journal publishes original technical papers dealing with theory and practice of vertical flight. The Journal seeks to foster the exchange of significant new ideas and information about helicopters and V/STOL aircraft. The scope of the Journal covers the full range of research, analysis, design, manufacturing, test, operations, and support. A constantly growing list of specialty areas is included within that scope. These range from the classical specialties like aerodynamic, dynamics and structures to more recent priorities such as acoustics, materials and signature reduction and to operational issues such as design criteria, safety and reliability. (Note: semi- and nontechnical articles of more general interest reporting current events or experiences should be sent to the VFS magazine