两种湍流模型时域颤振计算方法研究

采用时域计算分析方法进行了机翼跨音速颤振特性研究。在结构运动网格的基础上,采用格点格式有限体积方法进行空间离散和双时间全隐式方法进行时间推进求解雷诺平均N-S方程。针对流动粘性分别应用了SST湍流模型和SSG雷诺应力模型,通过对跨音速标模算例AGARD445.6机翼的计算结果与实验值的对比分析,其中应用SST湍流模型得到的颤振速度与实验值最为接近,特别是在跨音速段平均相对误差在3%以内;并且计算结果整体上反映了跨音速颤振"凹坑"物理特性,验证了方法的有效性。

Methods of the time-domain CFD method integrated different turbulence models

The time-domain CFD method is introduced to analyse the characteristics of the transonic flutter in this paper.The structured dynamic mesh technique is applied to simulate the movement of the flutter response of the AGARD445.6 wing.Full implicit dual-time temporal derivatives and cell-center finite volume method spatial derivatives are adopted to solve the N-S equations and treat the unsteady aerodynamic problem.This paper around the N-S equations without or with the SST turbulence model and SSG Reynolds stress model are numerically simulated.The computing AGARD445.6 wing flutter results validate the physical law of typical transonic flutter "dip" with the bottom near the domain which Mach number is one.Comparisons between computing and experimental flutter characteristics show good agreement,giving confidence in the accuracy of the aeroelastic capability that was developed.Especially in transonic flow period of use of the SST turbulence model,the best results by average relative error in 3%