不同网格拓扑对细长体绕流计算的影响研究

发布时间：2017-12-28 22:22

本文关键词：不同网格拓扑对细长体绕流计算的影响研究　出处：《力学季刊》2016年02期 　论文类型：期刊论文

【摘要】：分别运用扇形(Fan)、阶梯形(Ladder)、交界面形(Interface)网格对细长体小攻角对称、大攻角对称、大攻角非对称绕流流场进行了数值研究.通过涡核位置、涡簇显示、物面压力分布、轴向力分布等的计算结果比较了三种网格的计算精度.数值实验表明:细长体分离涡流场对边界层网格非常敏感,应严格控制边界层网格的正交性;随着攻角增大,流场对网格特性的敏感性有增高的趋势;阶梯形网格可能会对流场带入非物理性扰动,交界面网格对流场捕捉有不连续现象;将三种网格得到的物面压力、侧向力、流动分离位置与实验值进行对比,发现扇形网格误差最小、交界面网格误差最大;大攻角非对称流动时,扇形网格计算的侧向力有整体向细长体头部压缩的趋势,涡脱落位置靠前,第二个及第三个极值更大,说明非对称现象有向尾部发展的趋势.
[Abstract]:Respectively by Sector (Fan), (Ladder), at the junction of the stepped surface (Interface) grid on the symmetrical, slender body at high angle of attack at small angle of attack and attack angle of non symmetric numerical study on flow field of the symmetrical flow. The calculation precision of three kinds of grid were compared by calculating the position of the vortex core, vortex cluster display, surface pressure the distribution of axial force distribution results. Numerical experiments show that the slender body separation of boundary layer eddy current field grid is very sensitive, should strictly control the orthogonality of the boundary layer; with the angle of attack increases, the sensitivity of flow field on the grid characteristics have increased trend; stepped into the flow field of the grid may be non physical disturbance. Interface grid flow field capture discontinuous phenomenon; three grid to obtain the surface pressure, the lateral force and the flow separation position was compared with the experimental data, found that the fan-shaped grid minimum error and the error of the interface grid When the large angle of attack is asymmetric, the lateral force calculated by the sector grid has the trend of compression towards the slender body head. The vortex shedding is located at the front, and the second and the three extreme values are larger. This indicates that the asymmetry phenomenon is developing towards the tail.
【作者单位】：南京理工大学机械工程学院;宁夏大学数学计算机学院;
【基金】：国家自然科学基金(11202101)
【分类号】：O357.5
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