rhoCentralFoam structure and algorithm

immortality · May 17, 2013, 10:24

Hi everyone!
I wondering if whats the algorithm that rhoCentralFoam uses as a procedure?
the code in other solvers are more clear but rhoCentralFoam has a lot of reconstruction and interpolation that I don't understand the meaning of them to grasp its algorithm.
can anyone help me through finding its algorithm?
or guide to maybe a link of page?

startingWithCFD · May 17, 2013, 10:36

Google is your friend.

http://www.cscamm.umd.edu/centpack/p...9-centpack.pdf

immortality · May 17, 2013, 11:53

thank you.could you help me on how understand the procedures in a simple way so that i can show that stages in a "flow chart"( like rhoPimpleFoam by its loops that are clear for understanding and showing in flow charts)?
thanks.

ngj · May 17, 2013, 20:34

Hi Ehsan,

I believe you are interested in the pseudo-code presented on page 14 in the paper, which you find by following the link.

Kind regards

Niels

immortality · May 18, 2013, 09:00

Hi Niels
so is this summary algorithm based on the table true to create a flow chart?
time loop
1)predictor step for variables (lines 3,4,5,6 of the table)
2)solving continuity (line 7)
3)predictor step for momentum equation (lines 8 and 9)
4)solving momentum equation (line 10)
5)predictor step for Energy equation (lines 11,12 )
6)solving enery equation (line 13)
7)evaluating p (line 14)
increasing time and continue

is this list true and complete?
so there is not any other loop in the algorithm like PIMPLE loop and PISO,correct?
please let me know any thought to modify it better or if you verify my conclusion.
thanks.

ngj · May 18, 2013, 12:20

Hi Ehsan,

I merely took a quick look at the article, and found the mentioned table. Since it is a peer-reviewed journal article, I suppose it is correct at the point, where the article was written.

It will be up to you to understand the procedure and to verify that the method has not changed during the last 4 years, i.e. compare the source code with the journal article and identify potential discrepancies. If there are no discrepancies, then you have a nice reference for your work; otherwise you need to understand, why the code has been changed.

Kind regards

Niels

ShehabSalem · May 1, 2022, 04:48

Quote:

Originally Posted by startingWithCFD

Google is your friend.

http://www.cscamm.umd.edu/centpack/p...9-centpack.pdf

could you please share this link again, because it's not working?

ShehabSalem · May 1, 2022, 05:27

Quote:

Originally Posted by immortality

thank you.could you help me on how understand the procedures in a simple way so that i can show that stages in a "flow chart"( like rhoPimpleFoam by its loops that are clear for understanding and showing in flow charts)?
thanks.

Could you plzz, Share the rhoCenterFoam flow Chart?

HPE · May 1, 2022, 18:23

I think the article in the broken link is this: DOI:10.1002/fld.2069

ShehabSalem · May 2, 2022, 04:29

Quote:

Originally Posted by HPE

I think the article in the broken link is this: DOI:10.1002/fld.2069

Thanks so much

May 17, 2013, 10:24	rhoCentralFoam structure and algorithm	#1
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 27	Hi everyone! I wondering if whats the algorithm that rhoCentralFoam uses as a procedure? the code in other solvers are more clear but rhoCentralFoam has a lot of reconstruction and interpolation that I don't understand the meaning of them to grasp its algorithm. can anyone help me through finding its algorithm? or guide to maybe a link of page? __________________ Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King. To Be or Not To Be,Thats the Question! The Only Stupid Question Is the One that Goes Unasked.

May 17, 2013, 11:53		#3
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 27	thank you.could you help me on how understand the procedures in a simple way so that i can show that stages in a "flow chart"( like rhoPimpleFoam by its loops that are clear for understanding and showing in flow charts)? thanks. __________________ Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King. To Be or Not To Be,Thats the Question! The Only Stupid Question Is the One that Goes Unasked.

May 18, 2013, 09:00		#5
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 27	Hi Niels so is this summary algorithm based on the table true to create a flow chart? time loop 1)predictor step for variables (lines 3,4,5,6 of the table) 2)solving continuity (line 7) 3)predictor step for momentum equation (lines 8 and 9) 4)solving momentum equation (line 10) 5)predictor step for Energy equation (lines 11,12 ) 6)solving enery equation (line 13) 7)evaluating p (line 14) increasing time and continue is this list true and complete? so there is not any other loop in the algorithm like PIMPLE loop and PISO,correct? please let me know any thought to modify it better or if you verify my conclusion. thanks. __________________ Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King. To Be or Not To Be,Thats the Question! The Only Stupid Question Is the One that Goes Unasked. Last edited by immortality; May 18, 2013 at 12:33.

May 18, 2013, 12:20		#6
ngj Senior Member Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Copenhagen, Denmark Posts: 1,902 Rep Power: 37	Hi Ehsan, I merely took a quick look at the article, and found the mentioned table. Since it is a peer-reviewed journal article, I suppose it is correct at the point, where the article was written. It will be up to you to understand the procedure and to verify that the method has not changed during the last 4 years, i.e. compare the source code with the journal article and identify potential discrepancies. If there are no discrepancies, then you have a nice reference for your work; otherwise you need to understand, why the code has been changed. Kind regards Niels immortality likes this.

May 1, 2022, 18:23		#9
HPE Senior Member Herpes Free Engineer Join Date: Sep 2019 Location: The Home Under The Ground with the Lost Boys Posts: 931 Rep Power: 13	I think the article in the broken link is this: DOI:10.1002/fld.2069 __________________ The OpenFOAM community is the biggest contributor to OpenFOAM: User guide/Wiki-1/Wiki-2/Code guide/Code Wiki/Journal Nilsson/Guerrero/Holzinger/Holzmann/Nagy/Santos/Nozaki/Jasak/Primer Governance Bugs/Features: OpenFOAM (ESI-OpenCFD-Trademark) Bugs/Features: FOAM-Extend (Wikki-FSB) Bugs: OpenFOAM.org How to create a MWE New: Forkable OpenFOAM mirror

May 17, 2013, 10:36		#2
startingWithCFD Member Join Date: Nov 2012 Posts: 58 Rep Power: 14	Google is your friend. http://www.cscamm.umd.edu/centpack/p...9-centpack.pdf

May 17, 2013, 20:34		#4
ngj Senior Member Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Copenhagen, Denmark Posts: 1,902 Rep Power: 37	Hi Ehsan, I believe you are interested in the pseudo-code presented on page 14 in the paper, which you find by following the link. Kind regards Niels

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