摘要
与RANS湍流模型相比,DES湍流模型的边界层外自由流部分存在LES区,该区域的涡粘性会有所降低。为了研究了这一特征对γ-Reθt转捩模型的影响,以平板实验为算例,选取基于k-ωSST湍流模型的DES模型和DDES模型,检验γ-Reθt转捩模型在DES模型和DDES模型中的表现。结果表明:DES模型和DDES模型使转捩位置推迟,SST-DES模型由于对网格过度敏感而没有触发转捩,SST-DDES模型使转捩位置后移较少;DDES模型比DES模型更适合γ-Reθt转捩模型;转捩经验关系需要进行修正后才能将γ-Reθt应用于DDES模型。
Detached-Eddy Simulation（DES）methods have lower eddy viscosity than Reynolds-Averaged Navier- Stokes（RANS） method in its Large-Eddy Simulation（LES）zone outside the boundary layer, and will affect per- formance of γ-Reθt transition model. The behavior of γ-Reθt transition model implemented in DES and Delayed Detached-Eddy Simulation（DDES）model is investigated. The numerical test on flat plate shows that DDES method can delay the transition, and in DES method, transition is suppressed by the over-reduced eddy viscosi- ty. It indicates that DDES method is more suitable for implementing of γ-Reθt transition model than DES meth- od and recalibration of the transition model is required.
出处
《航空工程进展》
2013年第2期226-231,共6页
Advances in Aeronautical Science and Engineering
