Lecture Theme: • All CFD simulations follow the same key stages. This lecture explains how to go from the original planning stage through to analysing the end results. After this CFX will be introduced
Learning Aims – you will learn: • The basics of what CFD is and how it works • The different steps involved in a successful CFD Project • How to work with CFX
Computational Fluid Dynamics (CFD) is the science of predicting fluid flow, heat and mass transfer, chemical reactions and related phenomena
The equations for the conservation of mass, momentum, energy, etc.
CFD is used in all stages of the design process: • Conceptual studies of new designs • Detailed product development • Troubleshooting • Redesign
CFD analysis complements testing and experimentation by reducing total effort and cost required for experimentation and data acquisition
Domains, Boundary Conditions and Sources
The purpose of CFD analysis is to obtain quantitative and/or qualitative information about fluid flow performance of the system. This lecture will explain how to do this in CFD-Post.
Learning Aims: You will learn how to perform flow field visualization and quantitative data analysis on your CFD results
Solver Settings and Output File
Lecture Theme: – CFX requires inputs which tell it how to calculate the solution. By introducing the concepts of accuracy, stability and convergence, the purpose of each setting can be understood. Emphasis will be placed on convergence, which is critical for the CFD simulation
Learning Objectives: – You will be able to choose appropriate solver settings for your CFD simulation
Domain Interfaces & Moving Zones
Lecture Themes: – Domain Interfaces are important features that connect dissimilar domains or dissimilar meshes – Many CFD applications across industries involve systems or devices with moving parts. CFX offers many different models for rotating machinery, for arbitrary prescribed motion and for objects whose motion is determined by the flow
Learning Objectives: – You will be able to use domain interfaces and will become familiar with the CFX models for systems with moving parts and when a particular model is applicable
Lecture Theme: – Heat transfer has broad applications across all industries. All modes of heat transfer (conduction, convection – forced and natural, radiation, phase change) can be modeled. •
Learning Aims: – You will be familiar with CFX’s heat transfer modeling capabilities and be able to set up and solve problems involving all modes of heat transfer
Lecture Theme: • Engineering flows are turbulent • Successfully simulating such flows requires understanding a few basic concepts of turbulence theory and modeling
Learning Aims – you will learn: • Basic turbulent flow and turbulence modeling theory • You will understand the challenges inherent in turbulent flow simulation and be able to identify the most suitable model and near-wall treatment for a given problem.
Lecture Theme: – Performing a transient calculation is similar to performing a steady-state calculation, but there are additional considerations. More data is generated and extra inputs are required.
Learning Aims – you will learn: – Transient flow calculations are becoming increasingly common due to advances in high performance computing (HPC) and reductions in hardware costs. You will understand what transient calculations involve and be able to perform them with confidence
Best Practice Guide
Lecture Theme: – The accuracy of CFD results can be affected by different types of errors. By understanding the cause of each different error type, best practices can be developed to minimize them. Meshing plays a significant role in the effort to minimize errors. • Learning Aims: – Types of errors – Strategies for minimizing error – Issues to consider during mesh creation
Additional Variables (AVs), CFX Expression Language (CEL) & CFX Command Language (CCL)
Lecture Theme: – It is possible to create user variables, expressions and functions with which to customize a CFD model, e.g. physical properties of fluids, physical models. With a knowledge of the underlying command language, it is possible to make changes more quickly.
Learning Aims: – You will learn: •how to create Additional Variables (user variables) •how to set up equations and functions using CFX Expression Language (CEL) •the structure of CFX Command Language (CCL) and where it is used
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