Rosin-Rammler
 

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.

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