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*LIFTOPTION

Data format:

A single line comprising 2 parameters followed by an arbitrary number of parameters, as follows:

IOPTION CLIFT_DEF ITAB IGR(1) IGR(2) ... IGR(N)

Status :

Optional

Restriction :

Groups of elements IG(1), IGR(2), ... IGR(N) must have been previously defined.

Purpose :

To specify calculation settings for lift forces along groups of elements. The lift force may be activated as soon as the elements modelling the pipe are in contact with a surface and are cancelled as the pipe is being lifted off the surface.

Details:

Parameter	Description
IOPTION	=2: the lift force is automatically calculated for every elements of the groups when in contact with a surface.
CLIFT_DEF	Value of the lift coefficient used to compute the lift force if not otherwise defined in BEAMPRO2, CABPRO or *BARPRO.
ITAB	Table ID number, a table with two columns must have been previously defined (with *TABLEMCOL). The table provide a multiplication factor on the lift as a function of embedment over diameter. Note: If ITAB=0, the multiplication factor goes from 1 if no embedment to 0 for a one diameter embedment. Note: The table provides multiplication factor (line 1) versus ratio (line 2). The ratio are in increasing order. Negative ratio indicates that the pipe is above ground.
IGR(1) ... IGR(N)	List of groups to apply the lift force. If a - is used, all groups number between the two numbers (and including the two numbers) are considered. If group 0 is entered, all groups (RISER, MOORLINE, CASING, BUOY, *BLADE) are automatically added to the list.