*HYDROMESH

Data format:

A single line comprising 4 values

NFPF NGR IOP IUPD

Purpose : To define a mesh for a floater to be used to compute the hydrostatic force and location at each step

Restriction : A FPFDX and SURFACE must have been previously defined

Details :

Parameter	Description
NFPF	Master node of a floater (*FPFDX)
NGR	Number of the group defined by *SURFACE
IOP	The calculation option : - IOP=0: for non-linear hydrostatic wrt Surface Z=0 - IOP=1: for non-linear hydrostatic wrt Wave elevation at COG - IOP=2: non-linear hydrostatic wrt for Wave elevation at each element center - IOP=3: as 2 but including non-linear Froude-Krylov loads
IUPD	The update option: - 0 for At each iteration, (Static and Dynamic) - 1 for At each iteration (Static) and Beginning of each time step (Dynamic) - 2 for At each iteration (Static Only)

Note

1. The recommended option for IOP are IOP=0 (non linear hydrostatic in static, update of the hydrodynamic stiffness to be used for linear calculations in dynamic) and IOP=3 where the incident wave contribution is fully nonlinear in dynamic.

2. When IOP=3, the hydrodynamic database must provide the first order diffraction forces and moments RAOs (see keyword [DETAIL_EXC] of the hydrodaynmic databse file)