Regular Wave Drift Coefficients Data File
- Last UpdatedDec 18, 2025
- 2 minute read
This file may be imported if you require their own regular wave drift coefficients. The file has the following fixed contents:
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Record 1 |
TITLE |
Title of up to 72 alphanumeric characters. |
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Record 2 |
NWVDIR NFREQR |
Number of wave directions - maximum of 19, number of frequencies - maximum of 20. |
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Record 3 |
FREQR(JFREQR) |
NFREQ frequencies at which the coefficients are supplied |
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Record 4 |
WVDIR |
Direction of waves relative to centreline of vessel. The wave drift data must range from 0 to 180 degrees, at an interval between 10 and 30 degrees, 0 head onto the vessel. |
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Record 5 |
CXWVR(JFREQ), CYWVR(JREQ), CNWVR(JFREQ) |
NFREQ regular longitudinal and transverse wave drift force and yaw moment coefficients. |
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Record 5 is repeated NFREQR times. |
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Records 4 and 5 are repeated NWVDIR times. |
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The regular wave drift coefficients are defined by: |
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Longitudinal Force |
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Transverse Force |
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(4) |
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Yaw Moment |
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Record 3 is repeated NCDIR times. |
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The density of water 
is set to 1.025 tonnes/m3, the gravitational constant g is 9.81 m/s2, 
is the volume of displacement ( = CB Lpp BT), 
is the wave amplitude (m).