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*TYPCONTACT
Data format:
One line with up to 22 values
IGR1 IGR2 ITYP12 MU2 MU3 KN XSEUIL2 XSEUIL3 DENSITY CRIT_PROX L_MINI ID1 ID2 FRICTMOM IDSTIFFAMP RADRATIO IDTREN XMUO IDFAX IDFLAT INOR ISHELTER
Status :
Optional
Purpose :
To define the type of contact between two groups of elements
Restriction :
IGR1 must have been previously defined with keywords RISER or MOORLINE or SURFACE or GROUP
IGR2 must have been previously defined with keywords RISER or MOORLINE or *GROUP
Details :
| Parameter | Description |
|---|---|
| IGR1 | identification number of the first group of elements |
| IGR2 | identification number of the second group of elements |
| ITYP12 | = 0 no contact checking between group 1 and 2 = 1 external contact between lines group 1 and 2 = 2 group 2 is sliding inside group 1 = 3 contact between group 2 and the surface group 1 |
| MU2 / MU3 | axial / lateral friction coefficients |
| KN | linear contact stiffnes (N/m) |
| XSEUIL2 / XSEUIL3 | axial / lateral threshold displacement (m) |
| DENSITY | number of contact elements per unit length (def. 1) |
| CRIT_PROX | criteria for the selection of the proximity zone (m) (def. 10) |
| L_MIN | minimum proximity zone (m) |
| ID1 | Identification number of the soilstiff property (0 if not selected) |
| ID2 | Identification number of the suction property (0 if not selected) |
| FRICTMOM | equal to 1 to activate friction moment, 0 otherwise |
| IDSTIFFAMP | identification number of a *STIFFAMP property |
| RADRATIO | : ratio of radii in pipe-in-pipe case for frequency domain analysis. Contact is assumed if the ratio is less than the entered value. Equal to 0.2 by default. |
| IDTREN | identification number of a *TRENCH property |
| XMU0 | Value of friction before ramptime. The friction is then linearly |
| increased to the desired friction at the end of the ramptime | |
| IDFAX | ID of the *SPRINGPRO used to define the axial non linear friction law |
| IDFLAT | ID of the *SPRINGPRO used to define the lateral non linear friction law |
| INOR | 0 by default. If 1, the normal for the contact direction is reversed |
| ISHELTER | 0 by default. If set to 1, the hydrodynamic forces on the inner pipe are not modified by the presence of the outer pipe. By default, since version V5R5, the Morison forces are automatically modified in case of a pipe-in-pipe contact for the inner pipe: wave/current speeds and wave acceleration are disregarded; Drag force is computed considering the speed of the outer pipe as a curent speed; As a consequence the drag force is a function of the relative velocity of the outer pipe vs the inner pipe. |
Example :
*TYPCONTACT
1 2 1 0 0 1e6 0 0 20 0 1
3 4 3 0.1 0.5 1e7 1e-4 1e-4
Contact riser-riser without friction will be accounted for between group 1 and 2. A contact stiffness of 1e6N/m with a density of 20 contact elements per unit length will be considered. The default selection of the proximity zone will be used with a minimum length on the riser of 1m.
Contact between riser (group 4) and the surface 3 is considered with friction (axial friction coefficient of 0.1 and lateral friction coefficient of 0.5 Threshold displacements in both directions are 1e-4m). The surface stiffness is considered to be 1e7N/m.
