FENE

class FENE : public feasst::BondTwoBody

FENE is a two-body finite extensible nonlinear elastic two-body potential. R. B. Bird et al., Dynamics of Polymeric Liquids (Wiley, New York, 1977), Vols. 1 and 2.

$U=-0.5\ast$k_energy_per_length_sq $\ast$R_0 ${}^2\ln [1-{\left(\frac{r}{R_0}\right)}^2]$

where k_energy_per_length_sq and R_0 are input bond parameters in the particle.

Note that FENE is typically coupled with a WCA potential as described in LennardJonesCutShift.