[CFD] What is the difference between Upwind, Linear Upwind and Central Differencing?

An introduction to the three most common spatial discretisation (face interpolation) schemes used in Finite Volume CFD solvers such as ANSYS Fluent, OpenFOAM and CFX. The following topics are covered:

1) 2:03 Why do we need discretisation schemes?

2) 8:28 How do the discretisation schemes work?

3) 10:22 What is the difference between Upwind, Linear Upwind and Central Differencing schemes and which one should I choose?

4) 29:53 What about the advanced differencing schemes like QUICK, MUSCL, Gamma and Limited Linear?

#cfd #upwind #linearupwind

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Some useful references:
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1) H.Jasak, 'Error Estimation and Analysis for the Finite Volume Method with Application to Fluid FLows', PhD Thesis, Imperial College London, 1996. (Chapter 3 is the best!)
http://powerlab.fsb.hr/ped/kturbo/Ope...

2) ANSYS FLUENT User Manual
25.3.1 Spatial Discretisation
https://www.sharcnet.ca/Software/Flue...

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Disclaimer
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The methods, algorithms, equations, formulae, diagrams and explanations in this talk are for educational and demonstrative purposes only. They should never be used to analyse, design, accredit or validate real scientific / engineering / mathematical structures and flow systems. For such applications, appropriate trained, qualified and accredited (SQEP) engineers / scientists should be consulted along with the appropriate documentation, procedures and engineering standards. Furthermore, the information contained within this talk has not been verified, peer reviewed or checked in any way and is likely to contain several errors. It is therefore not appropriate to use this talk itself (or any of the algorithms, equations, formulae, diagrams and explanations contained within this talk) as an academic or technical reference. The reader should consult the original references and follow the verification and validation processes adopted by your company / institution when carrying out engineering calculations and analyses. Fluid Mechanics 101 and Dr. Aidan Wimshurst are not accountable or liable in any form for the use or misuse of the information contained in this talk beyond the specific educational and demonstrative purposes for which it was intended.