TUTORIAL(操作指南)

1、TUTORIAL（操作指南）（操作指南）TUTORIAL OVERVIEWPhilosophy for Using CFD FLOW-3D Filenames This chapter is intended to familiarize new users with each component of the FLOW-3D Graphical User Interface (GUI) and to walk through the setup and running of various simulations. Following this overviewis an explanati

2、on of four tabs on the GUI that are used for controls of various operations） within the software: Model Setup, Simulate, Analyze, and Display. After that section follows a discussion of how to pre-and post-process simulations. In the online Help file, four application-specific example problems are g

3、iven, to walk the user through problem setup and results visualization.The problems in this chapter are intended to cover the basics. New users are advised to work through all of the problems and the variations. The tutorial problems were chosen to illustrate a variety of topics and address a number

4、 of questions that might be encountered. This tutorial should be used while youre sitting at your computer running FLOW-3D.Philosophy for Using CFDComputational Fluid Dynamics (CFD)（計(jì)算流體力學(xué)） is a method of simulating a flow process in which standard flow equations such as the Navier-Stokes and contin

5、uity equation are discretized and solved for each computational cell.Using a CFD code is in many ways similar to setting up an experiment. If the experiment is not set up correctly to simulate a real-life situation, then the results will not reflect the real-life situation. In the same way, if the n

6、umerical model does not accurately represent the real-life situation, then the results will not reflect the real-life situation. The user must decide what things are important and how they should be represented. It is essential to ask a series of questions, including: What do I want to learn from th

7、e calculation? What is the scale and how should the mesh be designed to capture important phenomena? What kinds of boundary conditions best represent the actual physical situation? What kinds of fluids should be used? What fluid properties are important for this problem? What other physical phenomen

8、a are important? What should the initial fluid state be? What system of units should be used? It is important to ensure that the problem being modeled represents the actual physical situation as closely as possible. We recommend that users try to break down their complex simulation efforts into dige

9、stible pieces. Start with a relatively simple, easily understandable model of your process and work it through before moving on to add more complicating physical effects on an incremental basis. Simple hand calculations (Bernoullis equation, energy balance, wave speed propagation, boundary layer gro

10、wth, etc.) can give the user confidence that the model is set up correctly and that the program is running accurately.本章節(jié)的目標(biāo)是讓用戶熟悉 FLOW-3D 的圖形用戶界面及各個元部件，并完成各種工況的系統(tǒng)仿真；本章節(jié)重點(diǎn)解釋了 GUI 的四個制表符，它們主要是控制軟件的四種操作，即模型建立、數(shù)值模擬、數(shù)據(jù)分析和顯示。此后的章節(jié)，將討論如何做好模擬仿真前、后處理的準(zhǔn)備工作；在聯(lián)機(jī)幫助文件中，模擬仿真給出了四個應(yīng)用實(shí)例，將引導(dǎo)用戶正確設(shè)置和建立運(yùn)行環(huán)境，獲得可視化結(jié)果。本章重點(diǎn)

11、解決了“基礎(chǔ)訓(xùn)練”問題。對于新用戶，建議模擬前應(yīng)該先處理好操作中可能存在的問題和產(chǎn)生的變化。此外，一些問題則闡明了該仿真系統(tǒng)存在多種主題，還有多種問題將破壞尋址方式。在 PC 上運(yùn)行 FLOW-3D 時，請先認(rèn)真閱讀用戶操作指南。使用使用 CFD 的理念、宗旨的理念、宗旨計(jì)算流體力學(xué)（CFD）是一種用于流動過程模擬的方法。在模擬中，像Navier-Stokes 方程、連續(xù)性方程等標(biāo)準(zhǔn)流動方程要進(jìn)行離散化，對離散得到的每個單元進(jìn)行求解。使用 CFD 編碼與建立一個試驗(yàn)在許多方面都存在共同點(diǎn)。如果該試驗(yàn)在所模擬的現(xiàn)實(shí)環(huán)境下沒有準(zhǔn)確的建立，則實(shí)驗(yàn)的結(jié)果將無法反映以所模擬的現(xiàn)實(shí)環(huán)境下；同樣的，如果數(shù)值模型在現(xiàn)實(shí)環(huán)境中也沒有精確的表現(xiàn)出，則實(shí)驗(yàn)的結(jié)果也將無法反映在現(xiàn)實(shí)環(huán)境中。在 CFD 編碼中什么才是最重要的，怎么樣才能被很好的表現(xiàn)出來，這是用戶必須要知道的。為此，用戶對以下一系列的問題的回答是很有必要的，其中包括：從 CFD 的模擬結(jié)果中你能獲取些什么？什么是縮放變形？篩孔應(yīng)該如何設(shè)計(jì)才能夠獲得我們所需要的一些重要現(xiàn)象？在 CFD 模擬中一般使用哪種邊界條件？應(yīng)該用哪種流體？流體的哪種特性對 CFD 模擬的影響是最主要的？在模擬結(jié)果中，還有哪些物理現(xiàn)象是重要的？流體的初始流態(tài)應(yīng)該是怎樣的？在 CFD 模擬中