摘要
通过模拟结果与试验数据的对比,考察网格和湍流模型对计算精度的影响。结果表明,对不同的湍流模型,须将y+值、边界层网格总厚度和宽高比控制在相应的范围内以获得更高的计算精度;在一定范围内计算误差会随着湍流区域网格的细化而减小;低雷诺数总括壁面函数和SST k-ω湍流模型相结合能获得比采用Standard k-ε模型更精确的计算结果。
By comparing the simulation result with test data, the effects of mesh and turbulence model on the accuracy of computation are investigated. The results show that for different turbulence models, the y ＋ value, the total thickness and the aspect ratio of mesh in boundary layers, should be controlled within a corresponding range so as to achieve higher computation accuracy; the computational error will reduce with the refinement of meshes in turbulent area; and the SST k-to turbulence model combined with LRN adaptive wall function can obtain more accurate results than standard k-ε turbulence model.
出处
《汽车工程》
EI
CSCD
北大核心
2012年第1期36-39,45,共5页
Automotive Engineering
关键词
汽车
数值模拟
CFD
湍流模型
边界层
误差分析
vehicle
numerical simulation
CFD
turbulence model
boundary layer
error analysis
