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ANSYS AQWAProven Technology for Design and Analysis of Mobile Offshore Structures

ANSYS AQWA sotware is an engineering analysis suite o tools or

the investigation o the eects o wave, wind and current on foating and

xed oshore and marine structures, including spars, foating production

storage and ofoading (FPSO) systems, semi-submersibles, tension leg

platorms (TLPs), ships, renewable energy systems and breakwater design.

Projects today require that structure design and analysis be perormed

eciently in terms o time and cost. The powerul range o modeling

and analysis capabilities enables the rapid assessment o many design

alternatives, in particular early in a project, signicantly reducing overall

project costs and timescales.

Three ANSYS AQWA value-based packages are available to meet typical

analysis requirements: ANSYS AQWA Diraction, ANSYS AQWA Suite and

ANSYS AQWA Suite with Coupled Cable Dynamics.

Included with all o the ANSYS AQWA packages is the Hydrodynamic

Diraction analysis system, representing the rst phase o the integration

o ANSYS AQWA technology into the ANSYS Workbench platorm. This

provides direct links to ANSYS DesignModeler sotware, external CAD

geometry import, geometric parameterization and integrated meshing

technologies. In addition, the ANSYS AQWA Suite o products include theHydrodynamic Time Response analysis system, which is now exposed in

the ANSYSWorkbench platorm.

ANSYS AQWA Diffraction for Multi-body Diffraction Analysis

The ANSYS AQWA Diraction product provides an integrated environ-

ment or developing the primary hydrodynamic parameters required or

undertaking complex motions and response analyses. Three-dimensional

linear radiation and diraction analysis may be undertaken with multiple

bodies, taking ull account o hydrodynamic interaction eects that occur

between bodies. While primarily designed or foating structures, xed

bodies such as breakwaters or gravity-based structures may be included

in the models. Computation o the second-order wave orces via the ull

quadratic transer unction matrices permits use over a wide range o

ANSYS AQWA DiffractionProduct Features

Wave Diffraction and Radiation

3-D panel method

Multi-body wave diffraction and

radiation

Forward speed

Full quadratic transfer function

(QTF) calculation or slow drit

eects

Simulation of mooring andphysical connections through

user-dened stiness matrix

ANSYS AQWA SuiteProduct FeaturesAnalysis Options

Static and dynamic stability

Mean equilibrium position for

multi-body assemblies

Frequency-domain solution of

signicant and extreme linear

response due to rst-order waveand second-order, slowly varying

drit eects

Time-domain simulation of

extreme wave conditions including

nonlinear hydrodynamic eects

resulting rom the variable wetted

surace

Time domain simulation of slow

drit motions due to irregular seas

Coupled tension leg platform

(TLP) tendon analysis, including

stress and atigue

Computation and utilization of fullquadratic transer unction (QTF)

matrices or slow drit eects,

including both sum and dierence

requency components

Panel, slender tube or mixed

models acilitated

Fully coupled cable dynamic

eature enabling mooring line

drag and inertial characteristics to

be included in the vessel motions

analysisGeometry in ANSYS DesignModeler

sotware

Model imported into ANSYS AQWA

Diraction sotware, meshed and

analyzed

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water depths. User-dened stiness matrix denition enables mooring

and connection systems to be included in the diraction analysis where

these signicantly impact the motions response o the structures.

ANSYS AQWA Diffraction and Hull Design

ANSYS AQWA Diraction sotware can also generate pressure and

inertial loading or use in a structural analysis as part o the vessel hull

design process. The results rom a diraction analysis can be mapped

onto an ANSYS structural mechanics product or ANSYS ASAS nite

element model or urther structural assessment and detailed design.Since the mapping unction automatically accounts or mesh dier-

ences between the hydrodynamic and nite element models they do

not have to be topologically identical.

ANSYS AQWA SuiteProduct Features

Environmental Loading

Constant wind and current

Regular and irregular (spectral)

waves

Wave surface time history

Wind time history

Current prole Wind spectrum

Mooring Capabilities

Linear elastic lines

Intermediate pulleys

Linear drum winches

General nonlinear polynomial

Multi-segment composite catenary

Nonlinear composite catenary

Thrusters

Constant force lines

Fixed or oating fenders

Intermediate buoys and clump weights Line break facility

Quasi-static or dynamic catenaries

Articulations

Physical connections between two

or more vessels or to ground

- Fully xed

- Hinged

- Universal joint

- Ball joint

Connections can include stiffness,

damping and riction

Wave surace elevation plot showing intererence between

adjacent vessels

Hull pressure plot in

ANSYS AQWA Diraction

sotware

Stress results

in ANSYS

Mechanical

sotware ater

pressure

mapping

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ANSYS AQWA Suite Multi-body Global Hydrodynamic Analysis

The ANSYS AQWA Suite includes the AQWA Diraction package plus

comprehensive dynamic analysis capabilities or undertaking global

perormance assessments. The generic nature o the program enables

the hydrodynamic simulation o all types o oshore and marine struc-

tures including spars; foating production, storage and ofoading (FPSO)

vessels; semi-submersibles and ships. Specialized tether elements permit

idealization o tension leg platorms while inclusion o bending stiness

in the mooring denition enables improved modeling o rigid and fex-

ible risers.

Frequency- and Time-Domain Options

The ANSYS AQWA Suite provides the fexibility to undertake simula-

tions in either requency or time domains, thus combining the speed o

requency-domain solutions or screening and initial studies with rigor-

ous and more general time-domain capabilities. Slow-drit eects and

extreme-wave conditions may be investigated within the time domain,

and damage conditions, such as line breakage, may be included to inves-

tigate any transient eects that may occur.

Results Interpretation

ANSYS AQWA sotware provides extensive tools or results interpreta-

tion and manipulation, allowing many common and more advanced

processing requirements to be undertaken directly within the sotware

and enabling a rapid assessment o extensive results data, including:

Statistical interpretation of time-series data such as vessel motions

and mooring tensions to obtain mean, peak and signicant values

along with probability density, Rayleigh and Weibull Peak

distributions

Time-history lters and processors providing rapid access to funda-

mental data such as requency components and critical damping

Algebraic functions and combinations of results that provide a frame-

work or user-dened results interpretation, such as square root sum

o squares (SRSS) o horizontal motions or station keeping

ANSYS AQWA SuiteProduct Features

Special Features

General external force time history

User-dened external dynamic link

library enabling general orces to

be added to a time-domain solution;

or example, in the simulation

o dynamic positioning or powerextraction systems

User-dened external dynamic link

library enabling general load

generation; or dynamic positioning

systems, or example

Ability to directly access and retrieve

ANSYS AQWA results using Excel

High-order Morison elements to

permit dropped-object simulation

and dramatically simplied modeling

ANSYS AQWA Suitewith Coupled CableDynamics Product Features

Coupled Cable Dynamics

Frequency domain

Time domain

Fully coupled

Stand alone

Composite cables

Liting operations Renewable energy applications

3-D plot o response amplitude

operators against requency and

direction

Time history plot o mooring line

tension

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The ANSYS AQWA portolio o sotware solutions is part o the com-

prehensive range o applications rom ANSYS that collectively satisy

the demanding engineering and design requirements o the oshore

industry. Other sotware packages include ANSYS ASAS sotware

or advanced structural assessment o all types o xed and foatingstructures. The ANSYS AQWA product portolio is supported by the

ANSYS Mechanical structural analysis tool, and ANSYS CFX and

ANSYS FLUENT fuid analysis packages. ANSYS oers the most

complete range o solutions or the oshore industry, rom ront-

end engineering and design (FEED) studies through global analysis,

to component design. Solutions are available or contractors, consul-

tants, abricators, certication authorities, operators and equipment

manuacturers.

The ANSYS AdvantageWith the unequalled depth and unparalleled breadth o ANSYS engi-neering simulation solutions, companies are transorming their leading

edge design concepts into innovative products and processes that workToday, almost all o the top 100 industrial companies on the FORTUNEGlobal 500 invest in engineering simulation as a key strategy to win ina globally competitive environment. They choose ANSYS as their simulation partner, deploying the worlds most comprehensive multiphysics solutions to solve their complex engineering challenges. The engineeredscalability o solutions rom ANSYS delivers the fexibility customersneed, within an architecture that is adaptable to the processes anddesign systems o their choice. No wonder the worlds most successulcompanies turn to ANSYS with a track record o 40 yearsas the industry leader or the best in engineering simulation.

ANSYS, Inc.Southpointe275 Technology DriveCanonsburg, PA 15317U.S.A.724.746.3304ansysinfo@ansys.com

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ANSYS AQWA ProductGeneral Capabilities

Modeling

ANSYS Workbench interface providing

access to import o geometries rom

ANSYS DesignModeler sotware or

external CAD systems

Integrated meshing

Automatic generation of ship modelsrom line plans (osets)

Interface to ANSYS structural

mechanics products via ANSYS

Mechanical APDL command utility to

export ANSYS AQWA data rom

ANSYS geometric models

Pressure and inertial load mapping

to ANSYS Mechanical and

ANSYS ASAS simulation products

Visualization

Model display for mesh checking

including zoom, pan, rotation

controls together with acilities to

cut or exclude segments

Extensive facilities for view

manipulation, including:

- Moorings and their components

- Physical connections (articulations)

- Hull pressures

Animation sequence generation

or time history motions analysis

Animation of wave height proles

or air gap/wave on deck studies

Display of diffracted wave surface Powerful graphing functions

(2-D and 3-D)

Capabilities ChartThe table below shows the ANSYS AQWA capabilities or a given product package.

ANSYS AQWA ANSYS AQWA ANSYS AQWA SuiteDiraction Suite with Cable Dynamics

Model generation 4 4 4

Hydrostatics 4 4 4

Radiation/diraction 4 4 4

Load mapping to FEA 4 4 4

Static position analysis 4 4

(with moorings)

Dynamic motions analysis in 4 4requency domain

Dynamic motions analysis in 4 4

time domain

Quasi-static mooring model 4 4

Dynamic mooring models 4

(includes drag and inertial eects)