ansys-aqwa-12.1

12.1R E L E A S E

ANSYS ?AQWA

TM

Proven T echnology for Design and Analysis of Mobile Offshore Structures

ANSYS ?AQWA? software is an engineering analysis suite of tools for the investigation of the effects of wave, wind and current on floating and fixed offshore and marine structures, including spars, floating production storage and offloading (FPSO) systems, semi-submersibles, tension leg platforms (TLPs), ships, renewable energy systems and breakwater design.Projects today require that structure design and analysis be performed efficiently in terms of time and cost. The powerful range of modeling and analysis capabilities enables the rapid assessment of many design alternatives, in particular early in a project, significantly reducing overall project costs and timescales.

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

requirements:ANSYS AQWA Diffraction, ANSYS AQWA Suite and ANSYS AQWA Suite with Cable Dynamics.

Included with all of the ANSYS AQWA packages is the Hydrodynamic Diffraction analysis system, representing the first phase of the integration of ANSYS AQWA technology into the ANSYS ?Workbench? platform.This provides direct links to ANSYS ?DesignModeler?software, external CAD geometry import, geometric parameterization and integrated meshing technologies.

ANSYS AQWA Diffraction – Multi-body Diffraction Analysis

The ANSYS AQWA Diffraction product provides an integrated environment for developing the primary hydrodynamic parameters required for undertaking complex motions and response analyses.Three-dimensional linear radiation and diffraction analysis may be undertaken with multiple bodies, taking full account of hydrodynamic interaction effects that occur between bodies. While primarily designed for floating structures, fixed bodies such as breakwaters or gravity-based structures may be included in the https://www.wendangku.net/doc/b217441153.html,putation of the second-order wave forces via the full quadratic transfer function matrices permits use over a wide range of water depths.

Wave Diffraction and Radiation ?3-D panel method

?Multi-body wave diffraction and radiation

?Forward speed

?Full quadratic transfer function (QTF)calculation for slow drift effects Modeling

? ANSYS Workbench interface providing access to import of geometries from ANSYS DesignModeler software or external CAD systems ? Integrated meshing

?Automatic generation of ship models from lines plans (offsets)

?Interface to ANSYS ?Mechanical?product via ANSYS Mechanical APDL command utility to export ANSYS AQWA data from 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 facilities to cut or exclude segments ?Extensive facilities for view manipulation, including:

- Moorings and their components - Physical connections (articulations)- Hull pressures

?Animation sequence generation for time history motions analysis ?Animation of wave height profiles for air gap/wave on deck studies ?Display of diffracted wave surface ?Powerful graphing functions

ANSYS AQWA Diffraction

Product Features

Geometry in ANSYS DesignModeler software Model imported into ANSYS AQWA

Diffraction software, meshed and analyzed

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ANSYS AQWA Diffraction and Hull Design

ANSYS AQWA Diffraction software can also generate pressure and inertial loading for use in a structural analysis as part of the vessel hull design process. The results from a diffraction analysis can be mapped onto an ANSYS Mechanical or ANSYS ASAS finite element model for further structural assessment and detailed design. Since the mapping function automatically accounts for mesh differences between the hydrodynamic and finite element models they do not have to be topologically identical.

Analysis Options

?Static and dynamic stability ?Mean equilibrium position for multi-body assemblies

?Frequency-domain solution of significant and extreme linear response due to first-order wave and second-order, slowly varying drift effects

? Time-domain simulation of

extreme wave conditions including nonlinear hydrodynamic effects resulting from the variable wetted surface

?Time domain simulation of slow drift motions due to irregular seas ?Coupled tension leg platform (TLP) tendon analysis, including stress and fatigue

?Computation and utilization of full quadratic transfer function (QTF)matrices for slow drift effects,including both sum and difference frequency components

?Panel, slender tube or mixed models facilitated

?Fully coupled cable dynamic

feature enabling mooring line drag and inertial characteristics to be included in the vessel motions analysis

ANSYS AQWA Suite Product Features

Hull pressure plot in

ANSYS AQWA Diffraction software

Stress results in ANSYS Mechanical software after pressure mapping

Wave surface elevation plot showing interference between adjacent vessels

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ANSYS AQWA Suite Product Features

ANSYS AQWA Suite Multi-body Global Hydrodynamic Analysis

The ANSYS AQWA Suite includes the AQWA Diffraction package plus comprehensive dynamic analysis capabilities for undertaking global performance assessments. The generic nature of the program enables the hydrodynamic simulation of all types of offshore and

marine structures including spars; floating production, storage and offloading (FPSO) vessels; semi-submersibles and ships. Specialized tether elements permit idealization of tension leg platforms.

Frequency- and Time-Domain Options

The ANSYS AQWA Suite provides the flexibility to undertake simulations in either frequency or time domains, thus combining the speed of frequency-domain solutions for screening and initial studies with rigorous and more general time-domain capabilities. Slow-drift effects and extreme-wave conditions may be investigated within the time domain, and damage conditions,such as line breakage, may be included to investigate any transient effects that may occur.

Results Interpretation

ANSYS AQWA software provides extensive tools for results interpretation and manipulation,allowing many common and more advanced processing requirements to be undertaken directly within the software and enabling a rapid assessment of extensive results data, including:?Statistical interpretation of time-series data — such as vessel motions and mooring tensions — to obtain mean, peak and significant values along with probability density, Rayleigh and Weibull Peak distributions

?Time-history filters and processors providing rapid access to fundamental data such as frequency components and critical damping

?Algebraic functions and combinations of results that provide a framework for user-defined results interpretation, such as square root sum of squares (SRSS) of horizontal motions for station keeping

Environmental Loading ?Constant wind and current ?Regular and irregular (spectral)waves

?Wave surface time history ?Wind time history ?Current profile ?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 floating 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 fixed - Hinged

- Universal joint - Ball joint

?Connections can include stiffness,damping and friction

Renewable energy applications

Lifting operations Mooring line tension time history