FLUENT培训教材UDF.PPTVIP

* Explain for simple problems interpreted codes is the way to go. Does not require Makefiles. However, handles only a subset of the C language. It is not necessary and you should not go into a detailed description on each of the above DEFINE macros. Pick a couple and describe what they are used for. Don’t discuss all in detail. Don’t discuss all in detail. Don’t discuss all in detail. The setup for UDS are summarized in these two slides. Explain for simple problems interpreted codes is the way to go. Does not require Makefiles. However, handles only a subset of the C language. A Pera Global Company ? PERA China A Pera Global Company ? PERA China ANSYS FLUENT 培训教材 第七节：UDF 安世亚太科技（北京）有限公司 概要 FLUENT UDF简介 FLUENT 数据结构和宏 两个例子 UDF 支持 简介 什么是UDF? UDF 是用户自己用C语言写的一个函数，可以和FLUENT动态链接 标准C 函数 三角函数，指数，控制块，Do循环，文件读入/输出等 预定义宏 允许获得流场变量，材料属性，单元几何信息及其他 为什么使用 UDFs? 标准的界面不能编程模拟所有需求: 定制边界条件，源项，反应速率，材料属性等 定制物理模型 用户提供的模型方程 调整函数 执行和需求函数 初始化 可以使用UDF的位置 User-Defined Properties User-Defined BCs User Defined INITIALIZE Segregated PBCS Exit Loop Repeat Check Convergence Update Properties Solve Turbulence Equation(s) Solve Species Solve Energy Initialize Begin Loop DBCS Solve Other Transport Equations as required Solver? Solve Mass Continuity; Update Velocity Solve U-Momentum Solve V-Momentum Solve W-Momentum Solve Mass Momentum Solve Mass, Momentum, Energy, Species User-defined ADJUST Source terms Source terms Source terms Source terms UDF 数据结构 (1) 在UDF中，体域和面域通过Thread数据类型获得 Thread 是 FLUENT 定义的数据类型 为了在thread (zone)中获得数据，我们需要提供正确的指针，并使用循环宏获得thread中的每个成员(cell or face) Fluid (cell thread or zone) Boundary (face thread or zone) Domain Cell Domain Cells Cell Thread face Thread Faces UDF 数据结构(2) cell_t 声明了识别单元的整型数据类型 face_t声明了识别面的整型数据类型 Type Variable Meaning of the declaration Domain *d; d is a pointer to domain thread Thread *t; t is a pointer to thread cell_t c; c is cell thread variable face_t f; f is a face thread variable Node *node; node is a pointer to a node. Boundary