[gmx-users] epsilon_r vs. gb_epsilon_solvent

[bo.shuang]

Hi, all,

I have a question regarding epsilon_r value. Do I have to specify the
value in .mdp file? What is the default value if I do not specify it?

If I use implicit solvent, there is one parameter: gb_epsilon_solvent,
which is recommended to be 80 in the manual. What is the difference
between gb_epsilon_solvent and epsilon_r?

Thank you!

Bo