结构/非结构混合网格数值模拟栅格翼

Navier-Stokes computations of a grid fin missile on hybrid structured-unstructured grids

为了详细了解栅格翼内部的流动特性,设计满足飞行器性能要求的栅格翼,本文开展了多种不同单栅格外形的气动特性数值计算,对单个栅格的外形进行了初步选型研究;然后采用结构网格、结构与非结构混合网格求解NS方程,对带有两片栅格翼的导弹进行了数值模拟,结构网格计算结果与结构非结构混合网格计算结果一致,并与国外文献的计算结果和风洞试验结果进行了对比,三者的结果吻合较好。采用混合网格比结构网格的网格规模小许多,可以节省大量计算机内存和计算时间,是一种比较好的栅格翼数值模拟方法。

Several different cross-section shapes are moudled to research the detailed flow characteristics and to desigin the favourable cross-section for maximum normal force. Viscous CFD calculations are performed to predict the aerodynamic coefficients and flowfield for a missile with grid fins by using hybrid structure-unstructured grids. The comparisons between computational results and experimental data are made, The predicted results show excellent agreement with the experimental data and the reference on the normal force coefficients and the detailed flow field. Using the multi-block point-patched grid and structured-unstructured hybrid grid technique, high-quality grids are easy to be generated, computational time and computer memory can be decreased. This method of filling computational field with unstructured grid in the region adjacent to the grid fins is an effective method to simulate the viscous flowfields of complex grid fins aircraft configuration.