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*CONTACT
Data format:
A line with 9 parameters, as follows:
NBE NITCON NITNOR KN DISCON XL_MIN NBE_SOL KN_SOL IT_EXIT
Status:
Optional
Purpose:
To take into account contacts between risers
Restriction:
Risers must have been previously defined with the keyword *RISER
Details :
| Parameter | Description |
|---|---|
| NBE | Number of contact elements for each proximity zone. Used only if DENSITE (see *TYPCONTACT) is not defined. |
| NITCON | Number of iterations for convergence on contacts location. |
| NITNOR | Number of iterations for convergence on contacts normal direction. |
| KN | Stiffness used for the calculation of the reaction forces. These forces are proportional to the penetration. |
| DISCON | Tolerance on the penetration. |
| XL_MIN | Minimum length of proximity zone |
| NBE_SOL | Number of contact elements for riser/surface contacts |
| KN_SOL | Normal stiffness for riser/surface contacts |
| IT_EXIT | If convergence occurs three consecutive steps in less than IT_EXIT iterations, convergence is considered. Default value is 5. |
Example :
*CONTACT 20 5 2 1e6 1e-6
Twenty contact elements will be created in each detected area of neighborhood. At most, five iterations will be used to found out the best dispatching of these contact elements. For a given dispatching, the normal vector will be updated twice. When contact occurs, each contact element will behave like a spring with a stiffness of 1e6N/m. A transition phase of 1 mm will be accepted to help the convergence when penetration tends to zero.
