Added Mass Coefficients |
 
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Added Mass Coefficients |
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The layout of the added mass terms is shown below and this can be repeated as often as necessary to define the added mass over a sufficiently large range of frequencies:
FREQ= Frequency
where:
•Frequency is the frequency value in Hz, to which the coefficients relate
•AM11 is the surge added mass at the relevant frequency
•AM22 is the sway added mass at the relevant frequency
•AM33 is the heave added mass at the relevant frequency
•AM44 is the roll added mass at the relevant frequency
•AM55 is the pitch added mass at the relevant frequency
•AM66 is the yaw added mass at the relevant frequency
and the remaining terms represent the added mass terms between various degrees of freedom at the relevant frequency.
The order of input specification is surge, sway, heave, roll, pitch, yaw. So the individual entries represent:
Units are as follows:
where:
•M are mass units e.g. kg, tonne, slug, ton
•L are length units e.g. m, ft
•*ADDED MASS is used to define added mass for a floating body.
If you would like to see an example of how this keyword is used in practice, refer to E02 - CALM Buoy - Complex.