论文部分内容阅读
该文研究了使用谱方法进行内流周期性非定常计算的可行性及计算效率。在文中提出使用隐式时间推进方法求解相应的控制方程,用以加速收敛,并对计算方法的稳定性和无反射边界条件处理方法等进行了研究。使用时域谱方法对内流气动声学基准算例和二维喷管算例进行了计算。结果表明对周期性非定常流动,相对于常规的非定常时间推进方法,使用谱方法来逼近物理时间偏导数项可以提高计算精度并减少计算耗时,从而可以将其用于叶轮机械非定常流动计算。
In this paper, we study the feasibility and computational efficiency of using the spectral method to carry out periodic unsteady flow of internal flow. In this paper, we propose to use implicit time propulsion method to solve the corresponding control equations to accelerate the convergence, and to study the stability of the method and the processing method of non-reflective boundary conditions. The time-domain spectral method is used to calculate the aerodynamic acoustical baseline sample and the two-dimensional nozzle case. The results show that for the periodic unsteady flow, compared with the conventional unsteady time propulsion method, using the spectral approach to approximate the partial derivative of the physical time can improve the computational accuracy and reduce the computational time-consuming, so it can be used in the unsteady flow of impeller Calculate.