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

本项目的目的是在Germano提出的动态亚网格模型的基础上发展用于大涡模拟的湍流模型，该模型仅在基本湍流现象中进行评估。a）基于小火焰概念的预混合湍流燃烧的动态亚网格模型的开发，用于燃气涡轮燃烧室流。B）发展了一个考虑颗粒分布和湍流脉动双向耦合的含颗粒流动的动态亚网格模型。c）发展了一个考虑粘性耗散效应和网格尺度解中的网格依赖性的新概念亚网格模型。d）通过考虑湍流的各向异性效应，对外部强迫流场的动态亚网格模型进行了修改。e）考虑离散公式中的守恒特性，为有限元法和有限差分法开发了高精度数值格式。f）数值计算了附加滤波操作和为压缩数值不稳定性而引入的迎风格式所造成的影响。

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.