Is OpenFOAM tutorial cases valid?

j-avdeev · September 15, 2012, 10:45

Hello.

I am exploring mesh scale (cells count, prismatic layers) and residuals interaction. And I am going to use OpenFOAM tutorial cases as cases with perfect mesh (it's ok if in tutorial not best, but at least perfect mesh).

But I can not find any information such as "results of this cases was compared with real experimental results". From other side - it would be wrong for OpenFOAM developers to include wrong cases as tutorial.

Can someone to say exactly - OpenFOAM tutorials were compared with real experiment? Or maybe someone can give links on corresponding works.

First of all I am interested in incompressible/icoFoam, pisoFoam, simpleFoam cases.

Thank you.

alberto · September 16, 2012, 03:31

Tutorials are "proofs of concepts" to illustrate some of the functionality of the code.
They are not verification or validation cases, for obvious reasons of convenience (a tutorial has to run rapidly and demonstrate how to set a case up), so I would not expect them to have a "perfect" mesh

ConnClark · September 19, 2012, 16:41

I believe the PitzDaily case is based off of an actual experiment that you can compare the output of OF to if you wish. I don't have any details about it though.

ConnClark · September 19, 2012, 16:45

okay I have some info on it (this may not be the exact case but its a start)

Pitz, R.W., and John W. Daily, "An Experimental Study of Combustion: Turbulent Structure of Reacting Shear Layer Formed at a Rearward Facing Step," NASA Contractors Report 165427 (1981).

http://ntrs.nasa.gov/archive/nasa/ca...1981023603.pdf

Edit: Correct case to compare too
Pitz and Daily (AIAA Journal 21-11,1983 pg 1565-1570)

September 15, 2012, 10:45	Is OpenFOAM tutorial cases valid?	#1
j-avdeev Member Avdeev Evgeniy Join Date: Jan 2011 Location: Togliatty, Russia Posts: 69 Blog Entries: 1 Rep Power: 21	Hello. I am exploring mesh scale (cells count, prismatic layers) and residuals interaction. And I am going to use OpenFOAM tutorial cases as cases with perfect mesh (it's ok if in tutorial not best, but at least perfect mesh). But I can not find any information such as "results of this cases was compared with real experimental results". From other side - it would be wrong for OpenFOAM developers to include wrong cases as tutorial. Can someone to say exactly - OpenFOAM tutorials were compared with real experiment? Or maybe someone can give links on corresponding works. First of all I am interested in incompressible/icoFoam, pisoFoam, simpleFoam cases. Thank you.

September 16, 2012, 03:31		#2
alberto Senior Member Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,912 Rep Power: 36	Tutorials are "proofs of concepts" to illustrate some of the functionality of the code. They are not verification or validation cases, for obvious reasons of convenience (a tutorial has to run rapidly and demonstrate how to set a case up), so I would not expect them to have a "perfect" mesh wyldckat and Goutam like this. __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

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September 19, 2012, 16:41		#3
ConnClark New Member Conn Clark Join Date: Dec 2010 Posts: 11 Rep Power: 16	I believe the PitzDaily case is based off of an actual experiment that you can compare the output of OF to if you wish. I don't have any details about it though.

September 19, 2012, 16:45		#4
ConnClark New Member Conn Clark Join Date: Dec 2010 Posts: 11 Rep Power: 16	okay I have some info on it (this may not be the exact case but its a start) Pitz, R.W., and John W. Daily, "An Experimental Study of Combustion: Turbulent Structure of Reacting Shear Layer Formed at a Rearward Facing Step," NASA Contractors Report 165427 (1981). http://ntrs.nasa.gov/archive/nasa/ca...1981023603.pdf Edit: Correct case to compare too Pitz and Daily (AIAA Journal 21-11,1983 pg 1565-1570)