Current Coefficients Data File
- Last UpdatedDec 18, 2025
- 3 minute read
This file may be imported if you require their own current 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 |
NCDIR |
Number of current directions - maximum of 19. The current data must range from 0 to 180 degrees, at an interval between 10 and 30 degrees, with 0 head onto the vessel. Note: |
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Record 3 |
CDIR CXC CYC CNC |
Direction of current relative to centreline, longitudinal and transverse current force and yaw moment coefficients. CXC, CYC, CNC. This line is repeated NCDIR times. The current coefficients are defined at a given water depth H, for monohulls by: |
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Longitudinal Force |
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Transverse Force |
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(2) |
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Yaw Moment |
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Record 3 is repeated NCDIR times. |
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The density of salt water, 
, is set to 1.025 tonnes/m3. Lpp is the length between perpendiculars (m), T the vessel
draught (m), 
the current speed (m/sec) and 
the current direction (degrees).
For a semi-submersible the current coefficients are defined at a given water depth H by
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Longitudinal Force |
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Transverse Force |
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(3) |
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Yaw Moment |
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and 
(m2) are the transverse and longitudinal underwater profile of the vessel respectively.