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This section includes data such as environmental parameters (e.g. current and waves), boundary conditions of various kinds, internal fluid loading, and the analysis type and solution parameters.
This section contains the following keywords:
•*AERODYN DRIVER is used to provide a link between the structural (Flexcom) and aerodynamic (AeroDyn) models in a wind turbine simulation
•*ANALYSIS TYPE is used to specify the analysis type.
•*BOUNDARY is used to define boundary conditions.
•*CALM LOAD is used to specify data defining the force terms to be applied to a CALM buoy.
•*CLASHING SOLUTION is used to specify solution parameters associated with clashing.
•*CONTACT MODELLING is used to specify specialised parameters relating to guide surface contact modelling.
•*CRITERIA is used to specify certain criteria that need to be satisfied in a static analysis, and to define how the model is to be adjusted to satisfy the desired criteria.
•*CURRENT is used to specify current loading.
•*CURRENT COEFF is used to specify current coefficients used to determine the current loading on a floating body or moored vessel.
•*DAMPING is used to incorporate damping into a dynamic analysis.
•*DAMPING FORMULATION is used to specify the damping formulation to be used in a time domain dynamic analysis.
•*DAMPING RATIO is used to specify stiffness damping coefficients as a function of a damping ratio and a damping period.
•*DATABASE is used to specify the frequency of database output.
•*DATABASE CONTENT is used to customise the contents of the database output files.
•*DRIFT is used to define vessel drift motions.
•*FD ANIMATION is used to define playback parameters for a representative (time domain) structural animation which is fabricated from a frequency domain solution.
•*FORCE RAO is used to specify force RAOs for a floating body.
•*FRICTION is used to specify seabed friction stiffnesses.
•*INFLOWWIND is used to provide a link between Flexcom and FAST's wind-inflow data processing module InflowWind in a wind turbine simulation.
•*INTEGRATION is used to specify the number of integration points to be used in the Gaussian quadrature of element mass and stiffness matrices and load vectors.
•*INTERNAL FLUID is used to define the properties of an internal fluid.
•*LOAD is used to define arbitrary loading.
•*MOMENTS is used to specify the value of Molin’s yaw coefficient for a moored vessel, and also to specify the fractions of Molin’s Moment and Munk’s Moment that are applied to the moored vessel.
•*NAME is used to specify a title for the Flexcom analysis run.
•*NO FINAL STATIC is used to suppress the final static analysis step that is typically performed automatically by Flexcom following a frequency domain dynamic analysis.
•*NO FRICTION is used to suppress the effects of friction.
•*NO HYSTERESIS is used to suppress bending hysteresis effects.
•*NO PIP SLIDING is used to disable the interchangeable nature of sliding pipe-in-pipe connections.
•*NONLINEAR MODEL is used to specify a modelling approach for non-linear materials.
•*NONLINEAR STATIC is used to specify solution parameters used in the final static analysis performed automatically by Flexcom following a frequency domain dynamic analysis.
•*OFFSET is used to specify an offset of an attached vessel from its initial position.
•*PRINT is used to request additional printed output to the main output file.
•*QTF is used to specify Quadratic Transfer Functions (QTFs) that allow the slow drift loads on a floating body or moored vessel to be determined.
•*QTF CALIBRATION FB is used to specify calibration coefficients used to scale the QTF coefficients for a floating body.
•*RAMP is used to specify a linear or non-linear variation in the ramp value applied to loads and displacements.
•*RAO is used to specify Response Amplitude Operators for a vessel.
•*RAO,LOAD is used to specify RAO load data for a frequency domain analysis.
•*REGULAR WAVE EQUIVALENT is used to specify that Flexcom is to replace a random wave spectrum or spectra by an equivalent regular wave or waves, and to calculate equivalent sinusoidal boundary conditions for attached nodes.
•*RESTART is used to indicate that an analysis is to be restarted from a previous run.
•*SERVODYN is used to provide a link between Flexcom and FAST's wind turbine control module ServoDyn in a wind turbine simulation.
•*SLUGS is used to specify parameters relating to slug flow.
•*TEMPERATURE is used to apply thermal loading.
•*THRUSTER is used to specify thruster loads on a moored vessel.
•*TIME is used to define time parameters for an analysis.
•*TIME STEPPING is used to select the time stepping algorithm and to define associated numerical damping coefficients.
•*TIMETRACE is used to request the storage of results for timetrace postprocessing (this is mainly used in the area of time domain fatigue analysis).
•*TOLERANCE is used to define the analysis convergence tolerance measure and related data.
•*TWIST is used to apply a twist load about an element's local axis.
•*USER DEFINED ELEMENT provides advanced Flexcom users with the ability to define custom code for altering element properties.
•*USER SOLVER VARIABLES provides advanced Flexcom users with the ability to define custom code for increased modelling flexibility.
•*UPSTREAM STRUCTURE is used to specify the name of the Flexcom analysis of the upstream structure subjected to the free or undisturbed stream current velocity field.
•*VESSEL TIMETRACE is used to specify that the combined high and low frequency motions of a vessel are to be read from an ASCII timetrace data file.
•*VESSEL VELOCITY is used to specify a vessel constant velocity horizontal velocity.
•*VIV DRAG is used to instruct Flexcom to read vortex-induced vibration (VIV) drag coefficient amplification factors from the results of a Shear7 analysis.
•*VIV EFFECTS is used to instruct Flexcom to continuously run Modes/Shear7 analyses of the downstream structure during the wake interference analysis.
•*WAKE DOWNSTREAM is used to specify the composition of the downstream structure in terms of element sets for use in wake interference calculations. The keyword also facilitates the (optional) definition of lift coefficients in the case of a User-Defined wake interference model.
•*WAKE INTERFERENCE is used to specify that the present analysis should include wake interference effects, and to specify associated parameters.
•*WAKE UPSTREAM is used to specify the composition of the upstream structure in terms of element sets, for use in wake interference calculations. The keyword also selects the wake interference model to be used, and defines associated data to characterise the wake field.
•*WAVE-DEANS is used to specify Dean’s Stream regular wave loading.
•*WAVE-GENERAL is used to specify miscellaneous parameters to wave loading.
•*WAVE-JONSWAP is used to specify a JONSWAP random sea wave spectrum or spectra.
•*WAVE-OCHI-HUBBLE is used to specify an Ochi-Hubble random sea wave spectrum or spectra.
•*WAVE-PIERSON-MOSKOWITZ is used to specify a Pierson-Moskowitz random sea wave spectrum or spectra.
•*WAVE-REGULAR is used to specify regular Airy wave loading.
•*WAVE-STOKES is used to specify Stokes V regular wave loading.
•*WAVE-TIME-HISTORY is used to specify a random seastate in terms of a time history of water surface elevation.
•*WAVE-TORSETHAUGEN is used to specify a Torsethaugen random sea wave spectrum or spectra.
•*WAVE-USER-DEFINED is used to specify a User-Defined random sea wave spectrum or spectra.
•*WINCH is used to define winch elements.
•*WIND is used to specify wind loading.
•*WIND COEFF is used to specify wind coefficients used to determine the wind loading on a floating body or moored vessel.