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*Drag Lift |
 
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*Drag Lift
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*Drag Lift |
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To define non-linear drag lift relationships.
Refer to Drag Lift for further information on this feature.
Two lines, with the second line repeated as often as necessary to define drag lift coefficients at different ratios.
CURVE=Curve Name
Ratio, Drag Lift
Input: |
Description |
Curve Name: |
A name for the drag lift curve. |
Ratio: |
The ratio of the gap between the riser and the seabed and the drag diameter of the riser, for a point on the curve. |
Drag Lift Coefficient: |
The corresponding drag lift coefficient value |
(a)This table is used to define non-linear drag lift curves for a particular set of elements. Non-linear drag lift curves may be assigned to element sets using the *HYDRODYNAMIC SETS keyword.
(b)Use as many lines as you need to completely define a particular drag lift curve. Simply leave Column 1 blank for second and subsequent lines. For subsequent drag lift curves, put the curve name in Column 1 and specify the drag lift data in the same way.
(c)The points defining the non-linear drag lift curve may be specified in any order. Flexcom subsequently sorts the data pairs into ascending order of gap:diameter ratio.
(d)If the gap:diameter ratio for an element lies between the data points you specify, Flexcom uses linear interpolation to determine the relevant drag lift coefficient for the element.
(e)If the gap:diameter ratio for the element lies outside the specified range of the drag lift curve, then Flexcom simply extrapolates from the first or last section of the curve as appropriate.