[CFD] What are Thermal (Temperature) Wall Functions?
24 هزار بار بازدید -
6 سال پیش
-
An introduction to thermal (temperature)
An introduction to thermal (temperature) wall functions for CFD, what they are and how they work. The following topics are covered:
1) 1:02 What are thermal (temperature) wall functions and why are they needed?
2) 7:24 How are thermal (temperature) wall functions different to momentum (velocity) wall functions?
3) 13:44 What do CFD codes actually do?
4) 21:55 How is viscous heating (in compressible flows) accounted for?
==================================================
The following references may be useful:
==================================================
1) ANSYS Fluent 12.0 User Guide, Standard Wall Functions:
https://www.sharcnet.ca/Software/Flue...
2) Moser, Kim & Mansour, Direct numerical simulation of turbulent channel flow up to Re_tau = 590. Physics of Fluids, 11(4), 1999.
https://cfd.spbstu.ru/agarbaruk/doc/1...
2) C. Jayatilleke.
The Influence of Prandtl Number and Surface Roughness on the Resistance of the Laminar Sublayer to Momentum and Heat Transfer.
Prog. Heat Mass Transfer, 1:193-321, 1969.
This is the original paper with the definition of the 'P' function. However, it is quite difficult to find. It is much easier to refer to the PhD thesis:
3) C. Jayatilleke
The influence of Prandtl number and surface roughness on the resistance of the laminar sub-layer to heat and mass transfer.
PhD Thesis, Imperial College London, 1966.
https://spiral.imperial.ac.uk/bitstre...
3) The complete set of statistical DNS data for turbulent channel flow:
http://turbulence.ices.utexas.edu/MKM...
#cfd #wallfunctions #thermalboundarylayer
============================================
Want to learn more?
============================================
Grab a copy of my CFD Fundamentals Course (for beginners):
https://www.udemy.com/course/computat...
Learn how to write your own CFD code in MATLAB and python (for intermediates):
https://dr-aidan-wimshurst-s-school.t...
Learn how I draw my figures and diagrams in Inkscape (for everyone):
https://dr-aidan-wimshurst-s-school.t...
============================================
Did you like the video?
============================================
Download the lecture slides from my website:
https://www.fluidmechanics101.com/pag...
Buy me a coffee to say thanks:
https://www.buymeacoffee.com/NKEZrhvg0
Support the channel on Patreon (and get useful extras for your CFD studies):
Patreon: fluidmechanics101
============================================
Donations:
============================================
1) PayPal
https://www.paypal.me/fluidmechanics101
==================================
Disclaimer
==================================
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.
1) 1:02 What are thermal (temperature) wall functions and why are they needed?
2) 7:24 How are thermal (temperature) wall functions different to momentum (velocity) wall functions?
3) 13:44 What do CFD codes actually do?
4) 21:55 How is viscous heating (in compressible flows) accounted for?
==================================================
The following references may be useful:
==================================================
1) ANSYS Fluent 12.0 User Guide, Standard Wall Functions:
https://www.sharcnet.ca/Software/Flue...
2) Moser, Kim & Mansour, Direct numerical simulation of turbulent channel flow up to Re_tau = 590. Physics of Fluids, 11(4), 1999.
https://cfd.spbstu.ru/agarbaruk/doc/1...
2) C. Jayatilleke.
The Influence of Prandtl Number and Surface Roughness on the Resistance of the Laminar Sublayer to Momentum and Heat Transfer.
Prog. Heat Mass Transfer, 1:193-321, 1969.
This is the original paper with the definition of the 'P' function. However, it is quite difficult to find. It is much easier to refer to the PhD thesis:
3) C. Jayatilleke
The influence of Prandtl number and surface roughness on the resistance of the laminar sub-layer to heat and mass transfer.
PhD Thesis, Imperial College London, 1966.
https://spiral.imperial.ac.uk/bitstre...
3) The complete set of statistical DNS data for turbulent channel flow:
http://turbulence.ices.utexas.edu/MKM...
#cfd #wallfunctions #thermalboundarylayer
============================================
Want to learn more?
============================================
Grab a copy of my CFD Fundamentals Course (for beginners):
https://www.udemy.com/course/computat...
Learn how to write your own CFD code in MATLAB and python (for intermediates):
https://dr-aidan-wimshurst-s-school.t...
Learn how I draw my figures and diagrams in Inkscape (for everyone):
https://dr-aidan-wimshurst-s-school.t...
============================================
Did you like the video?
============================================
Download the lecture slides from my website:
https://www.fluidmechanics101.com/pag...
Buy me a coffee to say thanks:
https://www.buymeacoffee.com/NKEZrhvg0
Support the channel on Patreon (and get useful extras for your CFD studies):
Patreon: fluidmechanics101
============================================
Donations:
============================================
1) PayPal
https://www.paypal.me/fluidmechanics101
==================================
Disclaimer
==================================
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.
6 سال پیش
در تاریخ 1397/07/13 منتشر شده
است.
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