Modeling for large eddy simulation of complex turbulent flow based on dynamic subgrid scale model

本项目的目的是在Germano提出的仅在基本湍流现象中进行评估的动态子网格模型的基础上，发展适用于大涡模拟的湍流模型。A)发展了适用于燃气轮机燃烧室流动的基于火焰面概念的预混湍流燃烧动态亚网格模型。b)考虑了分布颗粒和湍流脉动之间的双向耦合，建立了颗粒流动的动态亚网格模型。c)发展了一个新的概念亚网格模型，在网格尺度的解中考虑了粘性耗散效应和网格依赖性。d)通过考虑湍流的各向异性效应，修正了外强迫流场的动态子网格模型。e)发展了高精度的有限元数值格式和有限差分格式方法在离散格式中考虑守恒性。f)对附加滤波操作和为压缩数值不稳定而引入的迎风格式所造成的影响进行数值计算。

This Project aimed to develop the turbulent, modeling for the large eddy simulation based on a dynamic sub-grid model proposed by Germano which were evaluated only in the fundamental turbulence phenomena.The following objects were investigated ;a) Development of a dynamic subgrid model for the premixed turbulent combustion based on the flamelet concept for applting to a gas-turbine combustor flows.b) Development of a dynamic subgrid model for the particle-laden flow by considering the two way coupling between distributed particles and turbulence fluctuation.c) Development of a new concept subgrid model by considering the viscous dissipation effect and the grid dependency in grid-scale solution.d) Modification of a dynamic subgrid model for the external forced flow fields by considering the anisotroic effect of turbulence.e) Development of the high accurate numerical schemes for the finite element method and the finite difference method considering the conservation characteristics in the discretized formulation.f) Numerical evaluation of the affects caused by the additional filtering operation and the upwind schemes introduced for the compress of the numerical instability.