https://github.com/sedfoam/sedfoam/blob/master/solver/kineticTheoryModels/granularPressureModel/Lun/LunPressure.H file

Original source file LunPressure.H

Classes

class Foam::LunPressure
"Kinetic theories for granular flow: Inelastic particles in Couette flow and slightly inelastic particles in a general flowfield." Lun, C. K. K., Savage, S. B., Jeffrey, D. J., and Chepurniy, N. (1984). Journal of Fluid Mechanics, 140:223–256.