*DATABASE

Data format:

A single line with 10 parameters, as follows:

IFLAGI IFLAG IREDUC IPRINT ICO IRE IOP NBPER TINI IVIV

Status:

Optional.

Purpose:

This keywords is used to define the database storage settings. This includes the following options: - To select a database storage type during static iterations.

To choose a full or a reduced database storage for dynamic analysis.
To choose a complete printing during a dynamic analysis.

Details :

Parameter	Description
IFLAGI	IFLAGI = 0 : no storage during Newton-Raphson iterations in static IFLAGI = 1 : storage during static calculations (default = 0)
IFLAG	IFLAG = 0 : reduced database for dynamic calculations. Only nodal positions are stored IFLAG = 1 : full database for dynamic calculations. Nodal positions, velocities and accelerations are stored. (default = 0)
IREDUC	IREDUC = 1 : the storage is restrained to specific nodes : - FPF centers of motion - Top of risers and moorings belonging to FPF - Nodes for which a none-interactive output (*OUT_) is required.
IPRINT	IPRINT = 0 :Reduced printing in the .LIS file : Except for the quasi-static analysis, the out-of-balance vector evolution at each time step during the iterative NEWTON procedure is not written. In the same way, the nodal positions when convergence is reached is written in the .lis file only for the quasi-static analysis. IPRINT = 1 : full writing in the *.lis file for every kind of analysis (dynamic, mooring stiffness calculation etc)
ICO	Flag to create the contact database/output. If ICO=0, the database is created, if ICO=1, the database is not created
IRE	Flag to create the reaction force database. If IRE=0, the database is created, if IRE=1, the database is not created
IOP	IOP=0 : classical database storage IOP=1 : reduced database storage
NBPER	If reduced storage save on NBPER periods
TINI	Start saving at tini unless NBPER is greater than 0
IVIV	IVIV=0: Unchanged IVIV=1: Create a frequency database (.dtbf) during a DeepVIV (modal) analysis

Note

If IFLAG = 0, velocities and accelerations are re-calculated when asked for from nodal positions.
IREDUC = 1 is recommended for coupled analysis between the floater and the seabed connections. IPRINT_DYN = 1 may be useful in case of convergence trouble.