ansys aqwa 13

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ANSYS AQWA 13.0

ANSYS AQWA software addresses the vast majority of analysis requirements associated withhydrodynamic assessment of all types of offshore and marine structures, including:

SPARs

FPSOs

Semi-submersibles

Tension leg platforms

Ships

Renewable energy devices

Breakwaters

View larger imageTwo packages are available.

ANSYS AQWA Diffraction provides an integrated facility for developing primary hydrodynamic parameters

required to undertake complex motions and response analysis. Model creation can be performed througha connection with ANSYS DesignModeler software (with the new hydrodynamic diffraction analysis systemin ANSYS Workbench) or via other ANSYS structural mechanics tools using a provided ANSYS APDLmacro.Hydrodynamic analysis results, such as motions and pressures, can be transferred to ANSYSstructural mechanics products, ANSYS ASAS or generically defined FE models for subsequent structuralanalysis.

ANSYS AQWA Suite extends ANSYS AQWA Diffraction to include analysis capabilities for global

performance of moored and/or connected systems subject to random sea states. Simulations may bestatic or dynamic in frequency and/or time domain. More advanced requirements, such as dynamicposition systems and energy dissipation, can be accomplished through a user-defined function.

ANSYS AQWA Features

ANSYS AQWA software addresses the vast majority of analysis requirements associated withhydrodynamic assessment of all types of offshore and marine structures.

Integrated System

ANSYS AQWA software is an integrated system for undertaking hydrodynamic and mooring analyses.Functionally is split into six operations:

Diffraction/radiation

Static and dynamic initial stability including the effects of mooring systems and other physicalconnections

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ANSYS AQWA 13.0

ANSYS ASAS 13.0

ANSYS ICEM CFD 13.0

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ANSYS ICEM CFD Cart3D 13.0

TGrid 13.0

ANSYS BladeModeler 13.0

ANSYS Vista TF 13.0

ANSYS SpaceClaim Direct Modeler 13.0

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Frequency domain dynamic analysis

Time domain with irregular waves including slow drift

Nonlinear time domain with large-amplitude regular or irregular waves

Hydrodynamic load transfer to a structural finite element analysis

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A graphical interface provides a common tool to facilitate visualization and results processing forthe ANSYS AQWA system.

An optional facility for coupled cable dynamics is available with the static and dynamic solvers (in bothfrequency and time domain) to provide more rigorous modeling of mooring system loading and response,especially in deep waters.

Modeling Flexibility

For large floating bodies, ANSYS AQWA requires a description of the hull form. A standard paneldiscretization of the hull is utilized in the radiation/diffraction stage of the simulation (and may be used insubsequent solvers, such as static and dynamic time domain solutions). This can be achieved in one ofseveral ways.

For ship-form shaped vessels, there is an automated mesh generator that works from the ship's linesplan (or offsets).

View larger imageFor more general vessel forms, the ANSYS DesignModeler tool may be utilized either to generate thegeometry directly or to import geometry from a wide range of CAD systems. This geometry can thenbe imported into the new ANSYS AQWA hydrodynamic diffraction analysis system that includes its ownmeshing capabilities. Alternatively, suitably defined external CAD geometry may be directly imported intoANSYS AQWA hydrodynamic diffraction.

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Total Capability for All Hydrodynamic Applications

ANSYS AQWA is not just for moorings or diffraction/radiation. It is a general-purpose hydrodynamicsanalysis tool that provides enormous flexibility to address most types of problems. Examples of its useinclude:

Design and analysis of mooring systems, including intermediate buoys and clump weights

Motions analysis of FPSOs

Determination of air gaps

Calculation of shielding effects of ships and barriers

Multiple body interactions during LNG transfer

Coupled cable dynamics

Sectional force calculations

TLP tether analysis

Dropped object trajectory calculations

Concept design and analysis of wave and wind energy systems

Simulation of lifting operations between floating vessels

Discharging landing craft from mother ships

Transportation of large offshore structures using barges/ships

Float over analyses

Motion analysis of spar vessels

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Stress Analysis Results Transfer

ANSYS AQWA WAVE is a linking program between the ANSYS AQWA diffraction calculation and afinite element model. It takes results in the form of pressures and motions for given wave directions andfrequencies and automatically applies them as pressures and accelerations to an ANSYS structuralmechanics or ANSYS ASAS finite element model. Differences in mesh density between the two modelsare accounted for automatically.


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Functional Interface to Microsoft Excel

When ANSYS AQWA is installed, a Microsoft® Excel® add-in is made available to permit directinterrogation of the ANSYS AQWA database via the insert function facility. This allows for custom reportgeneration, plotting and additional post-processing that can be defined by the user.

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The extraction of response amplitude operator information from a diffraction analysis

Available Functions

FUNCTIONS DESCRIPTION

Aqlcogcoord Returns x, y or z coordinate of a structure center of gravity

Aqlcoord Returns x, y or z coordinate of a node

Aqlelcent Returns x, y or z coordinate of a diffracting element' centroid

Aqlelpres Returns pressure at element centroid

Aqlfrequency Returns wave frequencies analyzed in ANSYS AQWA LINE

Aqlglobals Returns global parameters

Aqlmessage Returns error message for a given aql error flag number

Aqlndirns Returns number of wave directions for structure

Aqlnfreqs Returns number of wave frequencies for structure


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Aqlnlines Returns number of mooring lines in model

Aqlnstructs Returns number of structures in model

Aqlposition Returns position of a structure for time history analysis

Aqlrao Returns RAO information from hydrodynamic database

Aqlrao2 Returns interpolated RAO information from hydrodynamic database

Aqlstatmooring Returns mooring line information for static (ANSYS AQWA LIBRIUM) analysis

Aqlstatposcog Returns position of CoG for static (ANSYS AQWA LIBRIUM) analysis

Aqlstatposnod Returns position of specified node for static (ANSYS AQWA LIBRIUM) analysis

Aqlthacccog Returns acceleration of cog for time history analysis

Aqltharticulation Returns articulation reactions for time history analysis

Aqlthfender Returns fender information for time history analysis

Aqlthmooring Returns mooring line information for time history analysis

Aqlthnumsteps Returns number of time steps for time history analysis

Aqlthposcog Returns position of CoG for time history analysis

Aqlthtime Returns time associated with time step in time history analysis

Aqlthvelcog Returns velocity of cog for time history analysis

Aqlwavedirn Returns wave directions analyzed in ANSYS AQWA LINE

Aqlzcge Returns ZCGE parameter for structure in ANSYS AQWA LINE analysis

External Force Dynamic Link Libraries

ANSYS AQWA has the ability to include a user-defined external force algorithm via a dynamic linklibrary (DLL). A DLL can be created to calculate a force based on time, position and/or velocity of astructure. Example interfaces are provided for C or FORTRAN™, but any programming language thatcan produce a DLL can be employed. An added mass matrix can be computed at each time step tosimulate inertia forces. The calculation can be controlled by a set of up to 100 integer parameters and100 real parameters that may be input and then passed to the external force routine.

This facility can be used to model:

Dynamic positioning system

Steering system

Towing force provided by a tug

Damping system with unusual characteristics

Suction force between two ships close together, or between a ship and the sea bed

Fluid transfer between vessels

Calculated energy extracted from a wave-power device

Coupled Cable Dynamics

As an option, ANSYS AQWA software can include the effects of line dynamics by modeling the mooringlines as a series of rod elements. This has the added benefit of including drag loads and added masseffects of the line, which can be significant for the long lengths of line encountered in deep-water


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applications. The feature is available for both static (drag effects) and dynamic analyses. For thedynamic response, the capability is available within both the frequency and time domains. Frequencydomain solutions are very fast and can help determine whether cable dynamics need to be consideredas part of the analysis. Time domain solutions can provide much greater accuracy, but they take longerto run.

As a further level of investigation, individual lines may be processed through the graphical supervisor,providing detailed information about tensions and motions along the line.

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Differences can occur between including and excluding the effects of coupled cable dynamics. Thedistribution of energy during the analysis is also illustrated.

Powerful Modeling & Results Interrogation

The ANSYS AQWA graphical supervisor is the key module within the suite. It can perform a wide rangeof tasks.

Data review

Automatic mesh generation

Scaling of existing models

Results presentation

Powerful graphing facilities

Export to spreadsheets

Function processing (for example, nodal RAOs)

Transformation analysis (for example, time domain to frequency domain)

Bending moment/shear force calculation including forward speed

Sectional force calculation

Online tutorials/demos

Control and monitoring of analyses


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Multiple Body Articulations

ANSYS AQWA software has the ability to handle articulated structures, up to a maximum of 50structures and 50 articulations. This permits modeling of combined hydrodynamic and mechanicaldynamic configurations. Articulations can have stiffness, friction and damping included. If the mechanicalconnections are represented as tubes, these are allowed to become wholly or partially submerged andMorison-types forces are calculated.

Hydrodynamic Interaction between Bodies

ANSYS AQWA software can take into account the hydrodynamic interaction between adjacent vesselsand structures, since the motions of one structure can affect the motions of another. These structurescan be articulated, connected by cables or independent. A typical application is shielding effects.Forward speed effects can be included in the interaction.


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Other Information

ANSYS Vista TF 13.0

ANSYS ASAS 13.0

TGrid 13.0

ANSYS SpaceClaim Direct Modeler 13.0

ANSYS ICEM CFD 13.0


ANSYS BladeModeler

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