How to add electrical force into the lagrangian library
 

Hello all
I want to add electrical force into the lagrangian library and implement it in sprayFoam,
I found a report that describes how to do this, But I'm not sure it is correct!
I would be thankful to anyone that can help me with my question?

This is the reports' link:
http://www.tfd.chalmers.se/~hani/kur...aanMarkale.pdf