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所在平台: Udemy |
课程主页: https://www.udemy.com/course/cfd-analysis-of-backward-facing-step-bfs-and-validation/
课程评论：没有评论
## CFD 分析后向台阶（BFS）及其验证课程总结 本课程旨在教授计算流体动力学（CFD）分析的重要性，特别是验证（Verification）与确认（Validation）。通过对经典的后向台阶（Backward Facing Step, BFS）流动问题的分析，课程将指导学员如何将 CFD 模拟结果与实验数据进行比对，从而建立对模拟结果的信心。 **核心内容：** * **验证与确认的重要性：** 明确区分验证（检查模型实现和计算是否正确）与确认（检查模拟结果是否符合物理现实）。 * **后向台阶（BFS）案例：** 以 BFS 为例，这是一个 CFD 求解器验证的经典测试案例。课程将设定特定的雷诺数（Re = 100）和扩张比（H/h = 1.9423），并与已发表的实验数据进行比对，重点关注回流区长度。 * **三种 CFD 分析流程：** 1. **ICEM CFD + Fluent（独立模式）：** 这是最专业的方法，提供对网格划分（尤其是六面体网格）的完全控制，文件管理灵活。虽然文件传输需要手动，但本部分提供最详细的解释，推荐希望深入学习的学员。同时会涉及 Tecplot 进行后处理。 2. **Workbench：** 集成设计模型（Geometry）、Workbench 网格划分（Meshing）和 Fluent 求解。流程更直接，文件传输自动化，网格控制较少。适合不想深入 ICEM CFD 的学员。 3. **简易 Fluent 求解：** 直接使用预先生成的网格，仅在 Fluent 中进行求解。解释精炼，适合不想自行创建几何和网格的学员。 **技术要点：** * **问题解析：** 如何从研究论文中获取流动和流体性质以及实验结果。 * **速度型线：** 详细讲解 CFD 模拟中使用的速度型线，以及如何使用 UDF (User Defined Function) 在 Fluent 中编译。 * **解析推导：** 提供速度型线的解析推导过程。 **软件要求：** * **ANSYS Student (2022 R1)：** 可用于第二和第三种方法。 * **ANSYS Professional：** 需要用于第一种方法，因为 ICEM CFD 不包含在学生版本中。 该课程将帮助学员掌握 CFD 分析的关键环节，并能在学术或职业生涯中建立对模拟结果的可靠性评估能力。
In CFD analysis validation and verification are two important aspects for high quality results. Verification assessment determines if the programming and computational implementation of the conceptual model is correct. It examines the mathematics in the models through comparison to exact analytical results. Verification assessment examines for computer programming errors. On the other hand Validation assessment determines if the computational simulation agrees with physical reality. It examines the science in the models through comparison to experimental results. While Therefore in this course we are going to validate our results with corresponding experimental data from well know published data on backward facing step. This will show students that how much our simulation is close to actual data and builds confidence in them for other cases they wish to take in their academic or professional career. Backward facing step is well know test case f or the validation of CFD solvers for couple of decades. In this particular course we have examined the backward facing step at Reynolds number (based on hydraulic diameter) = 100 and expansion ratio H/h = 1.9423 (B f armaly 1983) and compared reattachment length downstream of step. We have found that the results are matching very well with experimental data. In the present course, I am providing you with three methods or way to conduct CFD analysis. You can learn all three or any one based on your preference and time you want to spend in learning CFD analysis of backward facing step. Before that I have alos given complete explanation of problem including how to get flow and fluid properties and corresponding experimental results from research papers. I have also explained the velocity profile used in the CFD simulation and how to compile that velocity profile using UDF in Fluent. Even the analytical derivation of velocity profile is also given in this course. 1. Using ICEMCFD and Fluent in stand alone mode. This is the most professional way to solve CFD simulation. You will have full control meshing process specially hexa meshing in ICEMCFD. And file management will also be according to your choice. But file transfers will be manual which can ad some extra work. This section has more explanation of every thing as compared to other sections. I would recommend this section if you really want to excel. You will also learn tecplot for CFD processing. 2. Using workbench. In this section you will create geometry in design modeler, meshing in workbench mesher and CFD in Fluent. Fluent part will be almost similar to section 1 but it contain less explanations. Geometry and meshing will be simple to create. We don't have much control on meshing process though. But advantage is that it is more straightforward. File transfer is automatic. Recommended for those who don't want to go for ICEMCFD or more details. 3. Most simple section to follow. As it uses already created mesh and just solves case in Fluent. Explantions are to be the point and are minimal. Follow this section if you dont to create mesh and geometry by yourself. Note: Section 2 and 3 can be solved using ANSYS Student (ANSYS 2022 R1) but section will require you to have ANSYS professional as ICEMCFD is not available in student version.
