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*SCATTER DIAGRAM

Purpose

To specify a wave scatter diagram, including the grouping of similar seastates into blocks, and the nomination of appropriate reference seastates

Theory

Refer to Summary Wave Scatter for further information on this feature.

Keyword Format

The wave scatter diagram is specified in sub-sections called blocks. Each block is defined by a single reference seastate and several other seastates within that same block.

For reference seastates, the data values are preceded by the REFERENCE tag, and the line also specifies the file name which corresponds to the time domain simulation for the reference seastate.

REFERENCE=Hs, Tz/Tp/Te, Number of Occurrences, FILE=File Name

 

Non-reference seastates within the same block as the reference seastate are then listed underneath, with the line repeated for as many seastates as you want to include within that seastate block.

Hs, Tz/Tp/Te, Number of Occurrences

 

The next block may then be defined, starting with the reference seastate followed by the other seastates, and so on until the entire wave scatter diagram has been defined.

Table Input

Reference Seastate Analyses

 

Seastate Scatter Diagram

Notes

(a)The scatter diagram is defined in terms of significant wave height (Hs) and mean zero up-crossing period (Tz), or peak period (Tp), or energy period (Te). If there is no occurrence of a particular combination of Hs and Tz/Tp/Te, you simply leave the corresponding cell blank.

(b)The number of occurrences is not currently used by Flexcom, but wave scatter diagrams are typically defined in this form anyway, and it should help to guide you in the creation of blocks and selection of reference seastates.