摘要
目前,CFD被广泛应用于预测飞机机舱内的气流组织状况。由于网格类型的选用会影响到计算的精度和成本,但是目前很少有研究分析不同网格对计算精度的影响。因此本文模拟了飞机机舱的设计工况,即等温强迫对流下的空舱环境,比较并评价了4种网格类型(六面体网格、四面体网格、十二面体网格、混合型网格)对飞机头等舱的流场环境计算结果的影响。结果表明:十二面体网格不能得到收敛的结果,因此不适用于飞机座舱的环境计算;在四种网格类型中,混合型网格计算消耗时间最短,为16.7h,计算结果与四面体和六面体网格的结果相对误差在10%以内,推荐优先使用;六面体网格与实验结果最接近,相对误差在15%以内,但是计算时间最长,为29.5h。通过本研究也表明:混合网格在网格过渡区域的截断误差为一阶量;而其他网格的截断误差均为二阶量,该误差在流场变化很大的地方会集中出现。因此在混合网格的生成过程中,应该尽量避免网格过渡区出现在流场变化强烈的地方。
Nowadays, computational fluid dynamics(CFD) is widely used in predicting cabin air distributions. Since grids used in CFD may influence accuracy of simulated results and computing costs, meshes play a significant role in the numerical simulation. However, there are few studies that investigate influence of different meshes. The influence of four grid types(hexahedral, tetrahedral, polyhedral and hybrid cells) on simulation of forced convection in cabin is investigated in this paper. The results showed that hybrid grids have least computing time and the accuracy of hybrid meshes is similar to that of tetrahedron and hexahedron. Hence, hybrid meshes are recommended. The hexahedral grids are most accurate but the computing costs are also highest. Polyhedral grid is not suitable to cabin which has complex geometry. In addition, hybrid grid has larger truncation error in grid transition zone. The truncation error has strong influences on the flow field where it changes drastically. Hence, we should avoid using transitional grid in the area where the flow field changes violently.
出处
《应用力学学报》
CAS
CSCD
北大核心
2015年第5期833-838,900,共6页
Chinese Journal of Applied Mechanics
基金
国家重点基础研究发展计划(973计划)(2012CB720100)
