3.1 数据通信系统的模型 3.2 有关信道的几个基本概念 3.3 信道的最高码元传输速率 3.4 信道的极限信息传输速率 3.5 模拟传输与数字传输 3.6 信道复用技术

1层次结构的概念 2S/OS参考模型 3网络体系结构的基本特性 4局域网和TCP/P的层次结构

1几代网络的不同技术 2网络的不同分类

The user FORTRAN routines are used for - Complex features not available through the command language > Non-uniform velocity profiles, variable material properties, moving grid, etc…

General form of equations solved in CFX-4 Integrating the equation over the control volume transient convection diffusion source

- The command file defines > Problem characteristics > Physical models and parameters > Material properties > Equation solvers

Tools / Lists : - is a temporary selection of entities - can be used as immediate input to a select databox - can be given more permanence by storing it as a group

Steps in Model Creation - build wireframe using points, curves, surfaces and solids. - define constraints for solids with area mismatch. - define boundary conditions (inlet, outlet, walls). - mesh all surfaces

The initial tolerance is important for geometry construction and grid construction. The preferred method to set the tolerance is to work from the Preferences pull down menu and select Global

build/import geometry create multi-block structures create patches mesh the geometry create a CFX-4 geo file