The problem in the DEFINE_DPM_SPRAY_COLLIDE macros
 

Hi everyone, now i am using dpm model to simulate a phenomenon including coalescence of solid particles. Now i check the information of Sthochastic collision in the ansys help, but i found this model is not so applicable for my case. More detailed, the collision rule of collision between two particles is only based on the Weber numer. So i want to define a new collision model for my case instead of the default one.

Now the problem is that i cannot get the arithmetic mean diameter of the two particles by the macros, which is mentioned in the inroduction of Sthochastic collision model. Is there any way to calculate the two mean diameter of the two parcels that will be collided in the fluent by UDF macros? The example in the UDF manual is so simple that consists no the important parameter for the collsion model i want.

Thanks,

Sincerely:)