ExcludedVolume #

A simple excluded volume potential.

\[U(r) = \epsilon\left(\frac{\sigma}{r}\right)^{12}\]

Example #

[[forcefields.global]]
interaction = "Pair"
potential   = "ExcludedVolume"

ignore.particles_within.bond    = 3
ignore.particles_within.contact = 1

spatial_partition.type = "CellList"
spatial_partition.margin = 0.2

cutoff     = 2.5
epsilon    = 0.2
parameters = [
    {index = 0, radius = 2.0}
]

Input Reference #

cutoff: Floating (Optional. By default, 2.)
- Cutoff distance relative to the \( \sigma_{ij} \) .
epsilon: Floating
- It determines the strength of the potential.
index: Integer
- The index of the particle. The index is 0-based.
offset: Integer (Optional. By default, 0)
- Offset for the index.
radius: Floating
- It determines the effective size of the particle.
- \( \sigma \) in the above equation is a sum of the radii.