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基于五阶空间离散精度的WCNS格式,开展了CRM翼/身/平尾组合体模型的高阶精度数值模拟,以评估WCNS格式对复杂外形的模拟能力以及典型运输机巡航构型阻力预测方面的精度。首先依照DPW组委会提出的网格生成指导原则,利用ICEM软件生成了粗、中、细3套网格,对应的y+分别为1、2/3和4/9。通过对CRM模型的计算和分析,研究了网格规模对气动特性、压力分布和翼根后缘局部分离区的影响。通过与DPW4统计结果和部分实验结果的对比,高阶精度数值模拟结果表明,本文的气动特性计算结果与统计平均结果吻合较好;网格密度对机翼内侧的展向站位压力分布影响较小,对机翼外侧展向压力分布影响较大;网格密度对翼根后缘局部分离区略有影响。
Based on the WCNS format of fifth-order spatial discretization, the high-order precision numerical simulation of the CRM wing / body / tail combination model is carried out to evaluate the accuracy of the WCNS format in simulating the complex shape and the drag prediction of the typical transport aircraft cruise configuration. Firstly, according to the guidelines of grid generation proposed by DPW Organizing Committee, three sets of coarse, medium and fine grids were generated by using ICEM software. The corresponding y + were 1, 2/3 and 4/9, respectively. Through the calculation and analysis of the CRM model, the effects of grid size on the aerodynamic characteristics, pressure distribution and the local separation zone of the trailing edge of the root were studied. Compared with the results of DPW4 and some experiments, the results of numerical simulation of high-order precision show that the aerodynamic characteristics of this paper are in good agreement with the statistical average results. The influence of grid density on the distribution of pressure on the inside of the wing Small, exert a great influence on the spreading pressure on the outer side of the wing; the mesh density has a slight effect on the segregation of the trailing edge of the wing root.