Harmonic

Definition

Name	Mesh>Harmonic
Type	Harmonic
Defined in	Edges

Calculate stretching energy by assuming that edges are Hookean harmonic springs [SN88]:

\[U = \frac{1}{2} k \left( l - l_0 \right)^2\]

where \(k\) is the spring constant, \(l_0\) is the length of the unstretched (reference) edge, and \(l\) is the current edge length.

Python calling

evolver.add_force("Mesh>Harmonic", {
    "k": {"1": str(spring_constant_value)}, # spring constant
    "l0": {"1": str(unstretched_bond_value)} # unstretched bond length
})