The Wave component is used to specify the various parameters that define a wave or seastate.
The component consists of a Type drop-down list to nominate the wave type you want to use in your dynamic analysis, and three buttons for data specification. The Wave Data button is always enabled, while the User Spectrum and Random Seed buttons are enabled for specific wave types.
PipeLay provides a range of wave specification options, comprising three regular wave types and five options for defining a random seastate. The regular waves are Airy, Stokes V and Dean’s Stream Function, while random seas may be either Pierson-Moskowitz, JONSWAP, Ochi-Hubble, Torsethaugen or User-Spectrum. When you click on the Wave drop-down box, you are presented with a total of 25 different options, of which only 10 will be visible at any one time, as shown in the figure below.
A scroll bar allows you to access the other options. There are 25 Wave Type options for just 8 different wave types (3 regular, 5 random) because some wave types occur in multiple options. For example, the figure above shows that the Stokes V wave occurs in 3 different options, depending on how you want PipeLay to calculate vessel motions from the wave. Likewise there are 4 Pierson-Moskowitz options, because there are 2 formats for defining the spectrum itself and 2 options for discretising the spectrum.