*DIOPTION

Data format:

One line with 17 parameters, as follows:

KCOUPL DXINC DRINC IOPT ID(1) ID(2) ID(3) ID(4) ID(5) ID(6) IECR(1) ICRE(2) IECR(3) IECR(4) IECR(5) IECR(6) IMOY

Status:

Optional.

Purpose:

To require the calculations of the FPF RAOs with the moorings/risers stiffness in the equilibrium position under mean load.

Restriction:

This keywords must be used with FPFDX where a hydrodynamic database is given. This keyword is recommended with LFOPTION or *WFOPTION.

Details :

Parameter	Description
KCOUPL	KCOUPL= 0 or 3: No specific option KCOUPL= 1: A stiffness matrix of the mooring is computed. It is written in the .lis file and used in the calculations if the mooring stiffness option is selected (see LFOPTION or WFOPTION KCOUPL= 2: The dynamic of the lines is not accounted for in the calculations
DXINC	Incremental displacements (in meters) imposed around static equilibrium positions for mooring stiffness calculation (default = 1 m).
DRINC	Incremental rotations (in degrees) imposed around static equilibrium positions for mooring stiffness calculation (default = 1 )
IOPT	IOPT=1: Incremental displacements range from 0 to DXINC and incremental displacements range from 0 to DRINC. IOPT=2: Incremental displacements range from -DXINC to DXINC and incremental displacements range from -DRINC to DRINC.
ID(I)	ID(I) = 0 : (KCOUPL= 1) the ith degree of freedom of the FPF center of motion is set free during the calculations of the equilibrium position under the mean loads. ID(I) = 1 the ith degree of freedom of the FPF center of motion is kept blocked during the calculations of the equilibrium position under the mean loads.
IECR(I)	Asks for the solver to write the environmental loads applied on floating vessels for the degree of freedom I in a text file. IECR(I) = 0: No file is written. IECR(I) = 1: Writing on the file named eff_i_kkk.txt (kkk is the number of the structure). - If LF motion, file parameters are: Time WaveEffort (2nd order) WindEffort CurrentEffort MooringEffort QuadraticEffort - If WF motion, file parameters are: Time WaveEffort (1st order) WindEffort CurrentEffort MemoryEffect QuadraticEffort WaveEffort(2nd order)
IMOY	Average environmental forces are applied linearly on a floater in a quasi static analysis from no force at stpe=0 to the complete force at the last time step (default with IMOY = 0) If IMOY=1, the whole force is applied starting at step 0