[jialixujia]

fvScalarMatrix alpha1Eqn
(
fvm::ddt(alpha1)
+ fvm::div(phi, alpha1, scheme)
+ fvm::div(-fvc::flux(-phir, beta, scheme), alpha1, scheme)
==ssss0
);
fvScalarMatrix alpha2Eqn
(
fvm::ddt(alpha2)
+ fvm::div(phi, alpha2, scheme)
+ fvm::div(-fvc::flux(-phir, beta, scheme), alpha2, scheme)
==ssss0
);
........

this is inhomogeneous descrete method population balance equation, and ssss0 is the source term (defined by coalescence and break-up)..is it right??