I want to solve some complicated problems. I used hybrid force fields Tersoff and lj/cut/coul/long, and also used PPPM for summation. Unfortunately, my simulations always crashed. If I turned off Tersoff or PPPM, lj/cut/coul/long + PPPM or Tersoff + lj/cut, both OK. I don't know how to deal with Tersoff when I must use PPPM for lj/cut/coul/long in my simulation?