Second order wave kinematics
2. Spectra

Input Wave spectrum

This is the input wave spectra, for instance Jonswap with given Hs and Tp.

Riflex estimates a minimum frequency f_{min} and a maximum frequency f_{max}. This is the lower and upper limits for the wave spectrum.

\(f_{min}=fac_{min}*\omega_{peak}\)

\(f_{max}=fac_{max}*\omega_{peak}\)

fac_{min} and fac_{min} is spectrum dependent

For numerical spectrum f_{min} and f_{max} is the first and last given frequency


that and f_{min} and f_{max} is slightly adjusted to correspond with the frequency resolution 

The 2. order wave spectrum consists of

Linear frequency wave energy spectrum

Difference frequency wave energy spectrum

Sum frequency wave energy spectrum

3. Pregeneration of kinematics

Length of kinematics time series, T:

Requested time series length

Time step used in the pregeneration, Δt

Time increment

Frequency resolution = 1/(applied time series length)

Applied time series length = N*Δt