Home > List of Keywords > *OCHIHUBBLE
*OCHIHUBBLE
Data format:
A single line with up to 10 values
NWAGEN TETH HS1 TP1 l1 HS2 TP2 l2 HMHS IRAND Tmin Tmax
Status :
Optional (dynamics)
Purpose :
To define a OCHI-HUBBLE wave spectrum divided into components of equal frequency bands
Restrictions:
If OCHIHUBBLE 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) |
| HSi | Significant heights |
| TPi | Peak periods |
| li | Peak enhancement factors |
| HMHS | Hmax/Hs ratio (Def = 1.7) 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 (Default = 0.4*Tp) |
| Tmax | Maximum period for the waves generation (Default = 2*Tp) |
Note
1) An OCHI-HUBBLE spectrum is composed of a high and a low-frequency sea states represented by modified Bretschneider spectra with peak enhancement factors l1 and l2. The total significant wave height is the square root of the sum of the squares of the two wave heights.
2) The maximum wave height will have just occurred at t = 2.*TP + 3*(TFIN-2.*Tp)/4 (see *DYNAMIC for TFIN).
