This data record is for defining the hydrodynamic properties for cable dynamic analysis and should be input after an ECAT data record (elastic catenary). If an ECAT data record is not followed by an ECAH data record, the program will use the coefficients defined in the previous ECAH data record. If there is no previous ECAH data record, the program will then use the default values for the coefficients.
2 5 7 11 16 21 26 31 41 51 61 71 81
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|X| | |ECAH|XXXXX|XXXXX|XXXXX|XXXXX| |XXXXXXXXXX| | | |
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| | | | | | | |_(6)Inline Drag Coefficient Cx (F10.0)
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| | | | | | |_(5) Equivalent Diameter for Drag De (F10.0)
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| | | | | |_(4) Transverse Drag Coefficient Cd (F10.0)
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| | | | |_(3) Leave Blank (for future use)
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| | | |_(2) Added Mass Coefficient Ca (F10.0)
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| | |_(1) Data Record Keyword(A4)
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| |_Optional User Identifier (A2)
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|_Compulsory END on last data record in Data Category (A3)
(2) Added mass is calculated by RHO*Ca*A per unit length in which RHO is the water density and A is the equivalent cross section area of the ECAT The COMP/ECAT/SSCB Data Records - Composite Catenary Mooring Line. In other words, the added mass is equal to the displaced mass of water multiplied by Ca. For cable dynamic analysis, the equivalent cross section area A must not be omitted in the ECAT definition. The default is 1.0.
(4) Transverse drag force is calculated by 0.5*RHO*Cd*V2*De per unit length where V is the relative transverse velocity. The default is 1.0.
(5) Equivalent diameter for drag. This allows the drag to be
based on a different diameter from the added mass. The default is 
(6) Inline drag force is calculated by 0.5*RHO*Cx*V2*De per unit length where V is the relative inline velocity. The default is 0.025.