How to implement Coulomb force?

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Hello, I would like to implement Coulomb force using magnetic or electric fields in mfix 22.2.2.
Thank you very much!

Hi. THis is a very open-ended question. Start off by searching the forum for “electr” and “magnetic”

Sorry. I will change my question a bit.
I searched the forum to implement Coulomb force due to magnetic or electric fields.
As a result, I thought that I could edit the code in calc_force_dem.f regarding particle contact and collisions.
So, I thought that the code that needed to be edited was the “Hertz spring-dashpot contact model” or the “Linear spring-dashpot contact model” or the “calculate the distance from the particles’ centers to the contact point, which is taken as the radical line” and all the codes related to these. I would appreciate any advice or guidance you can give me.