what does relaxation collision number mean in dsmcFoam???
 

dear foamers
I am using dsmcFoam,in the tutorials wedge15ma5,there is a dsmcproperties,in there,what does relaxtion collision number mean??and its function??

This is related to Larsen-Borgnakke model. I have simulated the Bird's horizontal flat plate and my results only agree when i changed VariableHardSphere to LarsenBorgnakkeVariableHardSphere, choosing 5.0 for the relaxation collision number:

// Binary Collision Model
// ~~~~~~~~~~~~~~~~~~~~~~

BinaryCollisionModel LarsenBorgnakkeVariableHardSphere;

LarsenBorgnakkeVariableHardSphereCoeffs
{
Tref 273;
relaxationCollisionNumber 5.0;
}