根据速度划分边界类型及自动设置边界参数

Classifying boundary types according to velocity and automatically setting boundary values

提出了流体速度已知边界和未知边界的概念 .一个边界条件的类型可以简单地根据该处的速度矢量是已知还是未知 (包括对称 )来加以区分 ;关于边界条件的数值 ,只有那些非零值的边界条件参数 (或者它们对应的通量 )才需要输入具体数值 ,其余边界条件参数值则会自动设定 .据此 ,编制了一个集纳维 斯托克斯方程求解器、前处理器和后处理器于同一程序模块的计算流体力学软件 ,该软件适用于一般二维流动与传热过程的数值分析 .

For a general purpose of numerical simulation of all kinds of two and three dimensional fluid flow and heat transfer, a novel concept of known and unknown velocity boundary(including axisymetric boundary) had been proposed to classify boundary types and set appropriate boundary values. During the pre process, the boundary type is easily identified with the idea of whether the velocity vector is known or unknown at a border. Those variables with non zero boundary values (or their fluxes) is required, and the rest of the boundary conditions compatible with the configuration can be set automatically according to the rule on classification of boundaries. As an implement of this concept, an “all in one package” sample CFD software (the Navier Stokes equations solver, pre and post processors in one package) has been developed and has proved to be highly proficient.