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Numerical parameters

  • Number of Gauss points: Number of Gauss points for the numerical integration of the external loads on beam and bar elements. Allowable values are: 2,3,4,10. The default value is 3.

  • Numerical scheme: This parameter sets the numerical method used to solve the quasi-static analysis. The "matrix profile" scheme is appropriate to solve analyses with contact issues as it reduces the bandwidth and therefore speeds up the calculation. The "matrix profile with constant stiffness" scheme is appropriate to solve analyses with low constraints (e.g. very low stiffness) but it generally slightly slower than the "matrix profile" scheme.

    Hint: Switching the scheme from "matrix profile" to "matrix profile with constant stiffness" helps in solving ill-conditioned cases.

  • Wave kinematics cutoff: This parameter is used to specify cutoff values when deriving wave kinematics. Wave kinematics decay rapidly with depth so that line elements located at some high depth experience negligible wave kinematics. Specifying a wave kinematics cutoff allows accelerating the simulations as the FE solver would not consider wave kinematics that are lower than a certain cutoff percentage of the wave kinematics calculated at the undisturbed free-surface level. Usual wave kinematics cutoff range from 1% to 5%. The actual depth below which wave kinematics is disregarded is reported in the LIS file for information.

  • Cable convergence parameters: These parameters set the values to used when solving for the cable interface pre-analysis stage: maximum number of iterations, cable positions on the floor, cable forces on the floor, cable positions in catenaries, cable forces in catenaries.