Large-Eddy Simulations of turbulent flows with lattice Boltzmann dynamics and dynamical system sub-grid models

In this paper,two sub-grid scale (SGS) models are introduced into the Lattice Boltzmann Method (LBM),i.e.,the dynamics SGS model and the dynamical system SGS model,and applied to numerically solving three-dimensional high Re turbulent cavity flows.Results are compared with those obtained from the Smagorinsky model and direct numerical simulation for the same cases.It is shown that the method with LBM dynamics SGS model has advantages of fast computation speed,suitable to simulate high Re turbulent flows.In ...     

具有通信受限的网络控制系统量化反馈控制

针对一类通信受限的网络控制系统,研究量化反馈控制器及动态调度策略的联合设计问题.考虑到介质访问约束和信号量化误差的影响,将网络控制系统建模为等价的离散时间切换系统;通过Lyapunov稳定理论推导出保证系统鲁棒稳定的模式及量化依赖型充分条件,并给出了量化反馈控制器的设计方法;在此基础上,设计了基于实时状态的动态通信调度策略,实现了网络控制系统的镇定控制.最后通过仿真示例验证了所提出方法的有效性.