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*TORSETHAU
Data format:
A single line with up to 13 values
NWAGEN TETH HS TP AF HMHS IRAND TMIN TMAX IOSP EXPONENT NB_DIR DELTA
Status :
Optional (dynamics)
Purpose :
To define a TORSETHAUGEN wave spectrum (divided into N frequency components) and generate the corresponding irregular wave in time domain
Restrictions :
If TORSETHAU is selected , DEPTH is required .
Details :
| Parameter | Description |
|---|---|
| NWAGEN | Number of sinusoidal wave components to be generated |
| TETH | Direction of propagation (degrees from the positive X axis) |
| HS | Significant height (m) |
| TP | Peak period (s) |
| AF | Factor (s.m3) |
| HMHS | The target maximum wave height over significant wave height ratio. A maximum wave height at least equal to HMHS x HS will be encountered during the simulation. If HMHS = 0, no maximum wave height is looked for. |
| IRAND | Arbitrary positive integer odd number used to trigger the phase random series generation. Two runs using the same IRAND value will generate the same phase series. (Def =12345). A integer I5 is recommended. |
| TMIN | Minimum period for the waves generation |
| TMAX | Maximum period for the waves generation |
| IOSP | = 1 : equal angle between spreading direction = 2 : spreading direction chosen such by constant energy |
| EXPONENT | Spreading function exponent |
| NBDIR | number of spreading directions |
| DELTA | maximum angle in degree of spreading from reference wave direction |
Note
1) The Torsethaugen spectrum is based on the simplifed form of the spectrum as defined in Appendix A of Recommended Practice DNV-RP-C205 - April 2014
2) The maximum wave height (if HM/HS is prescribed) occurs at t = 2.TP + 3(TFIN-2.Tp)/4 (see DYNAMIC for TFIN).
Examples :
*WAVJON
200 180. 2.0 5.6 6.6 2.0 12345 0.0 0.0
This defines an irregular wave of 2000 components, heading towards the negative X-direction. The significant height is 2.0 m and the peak period is 5.6 seconds. The factor is equal to 6.6. A Jonswap spectrum is selected and we ask for the ratio of the maximum wave height to the significant height to be 2.0. Random generator is equal to 12345 and TMIN and TMAX are computed automatically.
