Particle attraction in DEM models
 

Hi, I simulate about microscale metal powder.

So I want to activate particle attraction(gravity) in DEM models.

I found attraction options in DEM setting and their parameters, IPEXFORCE ~ DLEXFORCE

But, I can't understand each parameter mean.

because there is no units and any prescription about that.

please let me know about that gravity option parameters and simple examples.

Thank you for your help. p :)