Struct Phillips1958 

pub struct Phillips1958 {
    pub alpha: f64,
    pub omega: Array1<f64>,
}

The Phillips high-frequency tail

The Phillips spectrum is an early generational wave spectrum that principally captures the energy distribution in the high-frequency spectral tail. Its canonical form¹ is:

$$ S(\omega) = \frac{\alpha g^2}{\omega^5} $$

where $\alpha=0.0081$ denotes the Phillips constant and $g$ is the acceleration due to gravity.

Fields

• alpha - the Phillips constant (default: 0.0081)
• omega - frequency range [rad/s]

Methods

• energy - calculate the energy density spectrum
• f_hz - return the frequency space in [Hz]
• to_spec1d - convert to a Spectrum1 type
• to_spec2d - convert to a Spectrum2 type for a given Spreading type

References

---

1. O. M. Phillips, The equilibrium range in the spectrum of wind-generated waves, Journal of Fluid Mechanics, vol. 4, no. 4, pp. 426 434, 1958, doi: 10.1017/S0022112058000550. ↩

Fields

alpha: f64

omega: Array1<f64>

Implementations

impl Phillips1958

pub fn new() -> Self

create a new Phillips spectrum

Trait Implementations

impl Default for Phillips1958

fn default() -> Self

Returns the “default value” for a type.

impl SpectralCommon for Phillips1958

fn hs(&self) -> Result<f64, String>

significant wave height in [m]

fn tp(&self) -> Result<f64, String>

peak spectral wave period in [s]

fn omega(&self) -> &Array1<f64>

frequency space in [rad/s]

fn energy(&self) -> Array1<f64>

calculate the energy density spectrum

fn f_hz(&self) -> Array1<f64>

return the frequency space in [Hz]

fn wp(&self) -> Result<f64, String>

return the peak spectral frequency in [rad/s]

fn fp(&self) -> Result<f64, String>

return the peak spectral frequency in [Hz]

fn abs_error(&self) -> Result<f64, String>

calculate the absolute error between the significant wave height and the integrated energy

fn to_spec1d(&self) -> Spectrum1D

convert the spectrum to a 1D spectrum Type

fn to_spec2d(&self, spreading: &Spreading) -> Spectrum2D

convert the spectrum to a 2D spectrum Type for a given spreading Type