Rosin-Rammler

sh.CFD · January 22, 2017, 17:20

Hi;
I want to simulate spray A of engine combustion network(ecn.sandia.gov).
and use Rosin-Rammler distribution.I would like to know how the coefficients must be determined.I would be grateful if someone could help me with this matter.

matejfor · February 6, 2017, 07:03

Hi,

the best answer is: have a look into a source code.
You need to find source code files for RosinRammler model which are called:
RosinRammler.C and RosinRammler.H. You look at the H file to find out that:
//- Distribution minimum
65 scalar minValue_;
66
67 //- Distribution maximum
68 scalar maxValue_;
69
70 // Model coefficients
71
72 scalar d_;
73 scalar n_;

follows the eqauation:
cumulative model =
(1.0 - exp( -(( x - d0)/d)^n )
/ (1.0 - exp( -((d1 - d0)/d)^n )

http://www.openfoam.com/documentatio...r.html#details

HPE · February 11, 2021, 05:24

Rosin Rammler Distribution

January 22, 2017, 17:20	Rosin-Rammler	#1
sh.CFD New Member sanhe Join Date: Jan 2017 Posts: 2 Rep Power: 0	Hi; I want to simulate spray A of engine combustion network(ecn.sandia.gov). and use Rosin-Rammler distribution.I would like to know how the coefficients must be determined.I would be grateful if someone could help me with this matter.

February 11, 2021, 05:24		#3
HPE Senior Member Herpes Free Engineer Join Date: Sep 2019 Location: The Home Under The Ground with the Lost Boys Posts: 932 Rep Power: 12	Rosin Rammler Distribution __________________ 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

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February 6, 2017, 07:03		#2
matejfor Senior Member matej forman Join Date: Mar 2009 Location: Brno, Czech Republic Posts: 182 Rep Power: 17	Hi, the best answer is: have a look into a source code. You need to find source code files for RosinRammler model which are called: RosinRammler.C and RosinRammler.H. You look at the H file to find out that: //- Distribution minimum 65 scalar minValue_; 66 67 //- Distribution maximum 68 scalar maxValue_; 69 70 // Model coefficients 71 72 scalar d_; 73 scalar n_; follows the eqauation: cumulative model = (1.0 - exp( -(( x - d0)/d)^n ) / (1.0 - exp( -((d1 - d0)/d)^n ) http://www.openfoam.com/documentatio...r.html#details