基于归一化变量公式的高分辨率二维CFD求解器

Surin Vinoo Perumal, M. Yusoff
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引用次数: 0

摘要

用计算机研究涉及流体流动、传热和相关现象的系统被称为计算流体动力学(CFD)。定义流体流动现象的控制方程用CFD代码求解具体问题。CFD代码包括预处理程序、求解程序和后处理程序三个主要部分。本研究主要关注的是求解器元素。求解器利用预处理阶段的信息,通过函数逼近未知流量变量,离散控制流方程,求解方程。非结构化网格是解决复杂几何问题的首选。采用高分辨率(HR)格式来保证离散化技术的有界性,该格式源于归一化变量公式(NVF)。紊流提出了间歇性、分离和再循环等新问题。这些是在扩展当前的三维求解器来处理湍流时必须考虑的一些现象。研究方法包括CFD方程和湍流理论的文献综述、数值离散化和先进的规划技术。回顾现有的3D代码和测试运行对于理解源代码的结构和合并扩展是必要的。从解算器的输出可以然后分析使用Techplot 360,这是一个后处理程序。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High resolution 2D CFD solver based on Normalized Variable Formulation
The study of systems involving fluid flow, heat transfer and associated phenomena using computers is termed as computational fluid dynamics (CFD). The governing equations that define fluid flow phenomena are solved for specific problems using CFD codes. CFD codes comprise three main elements which are preprocessor, solver and postprocessor. The main concern of this research is the solver element. The solver uses information from the preprocessing stage to approximate unknown flow variables by means of functions, discretize governing flow equations and solving the equations. Unstructured meshes are preferred for solving complex geometry problems. Boundedness of the discretization technique is ensured by using High Resolution (HR) scheme which has its roots in Normalized Variable Formulation (NVF). Turbulent flows present new issues such as intermittency, separation and recirculation. These are some phenomena which must be accounted for in extending the current 3D solver to handle turbulent flows. The research methodology involves literature review on CFD equations and turbulent flow theories, numerical discretization and advanced programming techniques. A review of existing 3D code and test runs are necessary to understand the structure of the source code and incorporate extensions. The output from the solver can then be analysed using Techplot 360 which is a postprocessor.
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