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Dispersion relation for water waves

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Dispersion relation, and its inverse, for surface waves (eg, finding wavenumber from frequency).



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This set of functions simply provides an easy way to work with the dispersion relation of surface waves, given by

omega(k) = sqrt ( tanh(k*h0) * (g*k + gamma*k^3/rho))

where omega is the pulsation (in rad/s), k the wavenumber (in 1/m), h0 the depth, g the gravity, gamma the surface tension and rho the density.

The function kfromw allows one to invert the dispersion relation, i.e. to give the value of omega for a given value of k.
(For infinite depth, kfromw simply inverts the cubic polynomial. For finite depth, a zero-finding method is used, starting from the infinite depth solution).

By default, the physical parameters (liquid densities, surface tension, etc.) are set for an air-water interface under usual conditions, with a water layer of infinite depth ("deep water waves"). Use the function wave_parameter to change those properties.

See the published file "demo" to learn more about this package.

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