[CFD] Inflation Layers / Prism Layers in CFD

An introduction to inflation layers / prism layers, which can be generated by the majority of unstructured mesh generators (ICEM CFD, ANSA, ANSYS Workbench, SnappyHexMesh). The following topics are covered:

1) 02:00 Why do we use inflation layers in CFD?

2) 13:34 How do we choose the number of inflation layers (N) and the geometric growth ratio (G)?

3) 32:45 Why does the cell volume transition from the final layer to the freestream mesh need to be small?

#inflationLayers #fluidmechanics101 #meshing

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Check out the calculator on my website for calculating the growth ratio and the first layer height:
https://www.fluidmechanics101.com/pag...
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Some useful references

1. Computational Fluid Dynamics Blog - Leap Australia
'What y+ should I use? Part 3 - Understanding impact of y+ and the number of prism layers for flow resolution'
https://www.computationalfluiddynamic...

2. Wikipeda - Geometric Series
https://en.wikipedia.org/wiki/Geometr...

NOTE: the formula for the geometric series needs to extend from k=0 to N-1, not k=0 to N.

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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.