The ship-whale separation is used to calculate the deformation of the skin. The
parameters of the calculation are parms$Ly (impact area width, m),
parms$Lz (impact area height, in m), parms$Ealpha (skin elastic modulus in Pa),
parms$alpha (skin thickness in m), and parms$theta (skin bevel angle
degrees, measured from a vector normal to undisturbed skin).
whaleSkinForce(xs, xw, parms)Ship position (m).
Whale position (m).
A named list holding model parameters, created by
parameters().
A list containing force, the normal force (N), along with
sigmay and sigmaz, which are stresses (Pa) in the y (beam)
and z (draft) directions.
See whalestrike() for a list of references.