二维多段翼型网格生成与数值模拟研究

Mesh Generation and Simulation Method for 2-D Multi-element Aifoils

为提高多段翼型的网格生成效率和数值模拟精度,发展了一套自适应混合笛卡尔网格(AHCG)生成方法和基于有限体积方法的雷诺数平均Navier-Stokes(RANS)的数值求解技术。混合笛卡尔网格由围绕物体几何外形的贴体结构网格和填充流场其他区域的笛卡尔网格构成,两套网格之间的信息传递由"贡献单元"提供,且"贡献单元"由基于ADT(Alternating digital tree)技术的搜寻方法获得。为更准确地捕捉流场信息,采用了基于流场特征的网格自适应技术。数值模拟结果显示,AHCG方法能够准确且高效地模拟高升力多段翼型绕流问题。

An adaptive hybrid Cartesian grid（AHCG） method with a finite volume type Reynolds average Navier- Stokes （ RANS ） flow solver were developed for simulation of high lift multi- element airfoils. The hybrid Cartesian grid consisted of a body- fitted structured mesh in near- body region and an adaptive Cartesian mesh which matched the outer boundary of body- fitted grid. The＂ donor cell＂ was used to handle the interface region between the body- fitted mesh and Cartesian mesh. Meanwhile, a ＂ donor cell＂ search method based on ADT technique was presented. Feature based grid adaptations were carried out for simulating the flowfield more accurately. The efficiency and solution accuracy of the present method in dealing with high lift multi- element airfoils were demonstrated by the numerical results.