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*Current Coeff

Purpose

To specify current coefficients used to determine the current loading on a floating body or moored vessel.

Theory

Refer to Current Loads and Current Force Coefficients for further information on this feature.

Keyword Format

Data may defined explicitly within the keyword file itself, or defined separately in an external file which is simply referenced using a FILE= entry. The latter approach is highly recommended as it reduces unnecessary clutter in the keyword file, and also helps to improve user interface performance and enhanced user experience.

Floating Body

A block of data consisting of floating body name followed by a single line defining the name of an external file which contains current coefficient data.

FLOATING BODY=Floating Body Name

FILE=File Name

File Name should include the entire path of the file including its extension. If a file name or any part of its path contains spaces then it should be enclosed in double quotation marks.

A block of data consisting of floating body name followed by a single line repeated as often as necessary to define the current coefficients over a sufficiently large range of headings. The block itself may be repeated for different floating bodies.

FLOATING BODY=Floating Body Name

Floating Body/Current Heading, Current Coefficient in Surge, 

Current Coefficient in Sway, Current Coefficient in Yaw

 

Moored Vessel

A block of data consisting of a moored vessel tag line followed by a single line defining the name of an external file which contains current coefficient data.

MOORED VESSEL

FILE=File Name

File Name should include the entire path of the file including its extension. If a file name or any part of its path contains spaces then it should be enclosed in double quotation marks.

A block of data consisting of a moored vessel tag line followed by a single line repeated as often as necessary to define the current coefficients over a sufficiently large range of headings. Only one block is required, as a mooring analysis only contains one moored vessel.

MOORED VESSEL

Moored Vessel/Current Heading, Current Coefficient in Surge, 

Current Coefficient in Sway, Current Coefficient in Yaw

 

Table Input

Floating Body (External File)

Floating Body

Moored Vessel (External File)

Moored Vessel

Notes

(a)If the equivalent current incidence does not exactly match one of the relative current headings specified, Flexcom linearly interpolates between the nearest user-specified headings to find the relevant values of the current coefficients.

(b)If the equivalent current incidence is outside the range of user-specified headings, the current coefficients are assumed to be zero. For this reason, it is recommended that you specify current coefficients over a sufficiently large range of headings to ensure that current coefficients are defined for any heading likely to arise in an analysis.

(c)The headings for the current coefficients need not necessarily be specified in any particular order (ascending order is not necessary).