*LAYING

Data format:

One line with 6 values

IGR MINRAT MAXRAT NBEL ID VEL

Status :

Optional

Purpose :

To define a winch including modeling of cable elements. Cable elements initially connected to a reference node are progressively released over the time-domain simulation to simulate the effect of the cable being paid-out.

Restrictions :

Elements composing the cable must have been defined previously with the proper BCDOF and QCDC parameters.

Details :

Parameter	Description
IGR	elements group identification number
MINRAT	min length ratio. This value is used to define the minimum length of elements when released. Recommended value is 0.5
MAXRAT	max length ratio. This value is used to define the maximum length of elements when released. The next element will be released as soon as the top element length reaches the maximum length. Recommended value is 2.0
NBEL	number of elements connected to the reference node
ID	identification number of the reference node for the winch
VEL	laying speed in m/s

Note

All the nodes of the fixed line are given the position of End_2. Once the group is created all the nodes in the fixed section are assigned a 222222 type degrees of freedom through a BCDOF condition. All the nodes of the lines (both parts) are assigned into a QCDC keyword, with connection/disconnection time equal to 1e9s and ddls 000000 if they are on the fixed section or 222222 for the free section. If the free line is split, this assignment will only extend to the split, split excluded, otherwise it extends to End_1, End_1 excluded. A reference node is created at the winch location on which the winch BC are applied. The boundary condition should be restricted to pin/clamp (maybe user defined). If the winch is linked to a FPSO or other object, this node will be slave of the required fairlead. If a fixang is necessary, it has to be imposed on that reference node.

Example :

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

C

C   2 .   L I N E   M E C H A N I C A L   P R O P E R T I E S

C

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

C

C -- Flexible pipe segment types

C -- FlexPipe_1

*MAT

1 2.1e+011 0.0001 7.85 0 0. 0\. 0. 0 7e+008 0  0 0. 0. 0.

*BEAMPRO

1 0 150 0.2 1.2 2 0 0 1e+009 1e+006 1e+006 1e+007 1  0  0  0

*BEAMPRO2

1 0 0 0.02 0.2 0.2

C

C

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

C

C  3 .   L I N E S

C

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

C

C -- Begin line : GenLine_1

*NODES

1 000000 -100 0 -55

2 000000 -99.3844 0 -42.7981

3 000000 -97.5528 0 -30.8967

4 000000 -94.5503 0 -19.5887

5 000000 -90.4508 0 -9.15275

6 000000 -85.3553 0 0.154329

7 000000 -79.3893 0 8.10333

8 000000 -72.6995 0 14.4985

9 000000 -65.4508 0 19.1824

10 000000 -57.8217 0 22.0397

11 000000 -50 0 23

12 000000 -50 0 23

13 000000 -50 0 23

14 000000 -50 0 23

15 000000 -50 0 23

16 000000 -50 0 23

17 000000 -50 0 23

18 000000 -50 0 23

19 000000 -50 0 23

20 000000 -50 0 23

21 000000 -50 0 23

22 000000 -50 0 23

23 000000 -50 0 23

24 000000 -50 0 23

25 000000 -50 0 23

26 000000 -50 0 23

27 000000 -50 0 23

28 000000 -50 0 23

29 000000 -50 0 23

30 000000 -50 0 23

31 000000 -50 0 23

*B2GEN

10 1 1 1 1 2 1 1 1 100

20 11 1 11 1 12 1 1 1 200

*RISER

1 1 - 30

*FLUID-IN

1 1 1 100000

C

C -- Connections

C -- <GenLine_1::SplitPt> is connected to <FPSO_1:Fair-lead_1> with a pin

*NODES

32 111111 -50 0 23

c reference node for the winch

*NODES

40 000000 -50 0 23

*BCDOF

40 111000

*SLAVE

40 32

C Nodes for passive elements are blocked

*BCDOF

11 222222

12 222222

13 222222

14 222222

15 222222

16 222222

17 222222

18 222222

19 222222

20 222222

21 222222

22 222222

23 222222

24 222222

25 222222

26 222222

27 222222

28 222222

29 222222

30 222222

31 222222

C creation of the required QCDC

*QCDC

1e9 2 222222

1e9 3 222222

1e9 4 222222

1e9 5 222222

1e9 6 222222

1e9 7 222222

1e9 8 222222

1e9 9 222222

1e9 10 222222

1e9 11 000000

1e9 12 000000

1e9 13 000000

1e9 14 000000

1e9 15 000000

1e9 16 000000

1e9 17 000000

1e9 18 000000

1e9 19 000000

1e9 20 000000

1e9 21 000000

1e9 22 000000

1e9 23 000000

1e9 24 000000

1e9 25 000000

1e9 26 000000

1e9 27 000000

1e9 28 000000

1e9 29 000000

1e9 30 000000

1e9 31 000000

C keyword laying

*LAYING

1 0.5 2 10 40 1

C

C-- End line   : GenLine_1