ANSYS AQWA for Hydrodynamic Analysis UK/staticassets/RM...• China Ship Classification Society ......
Transcript of ANSYS AQWA for Hydrodynamic Analysis UK/staticassets/RM...• China Ship Classification Society ......
ANSYS AQWA ANSYS AQWA forfor
Hydrodynamic Hydrodynamic AnalysisAnalysis
ANSYS AQWA ANSYS AQWA forfor
Hydrodynamic Hydrodynamic AnalysisAnalysis
Richard MayRichard MayRichard MayRichard May
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Richard MayRichard May
AQWA DevelopmentAQWA Development
ANSYS HorshamANSYS Horsham
Richard MayRichard May
AQWA DevelopmentAQWA Development
ANSYS HorshamANSYS Horsham
What is AQWA?
•AQWA is a modularised, fully integrated hydrodynamics analysis suite based around 3-D diffraction/radiation methods.
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diffraction/radiation methods.
History of AQWA
• Developed since 1971 (by WS Atkins)
• Owned and developed by Century Dynamics since
2001
• Century Dynamics acquired by ANSYS February 2005
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• Century Dynamics acquired by ANSYS February 2005
• Now being integrated into the ANSYS Workbench
system
Some Clients
Regulatory Bodies
• ABS (US)
• Lloyds Register (UK)
• Germanischer Lloyd
• China Ship Classification Society
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• China Ship Classification Society
• RINA (Italy)
Some Clients
• US Navy
• SBM Monaco
• SBM Atlantia
• Allseas
• Dockwise
• Friede & Goldman
• INTEC
• Arup Energy
• Alion
• Atkins
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• Dockwise
• Huismann Itrec
• VUYK
• Technip
• WorleyParsons
• GustoMSC
• REpower
• AMOG
• D2M
• Moffatt & Nichol
• Noble Denton
• Han Padron
• Krylov Institute
• VersaMarine
ANSYS AQWA - Capabilities
• Diffraction and Radiation including Morison elements
• Frequency domain analysis
• Stability including mooring lines
• Time domain with irregular waves
• Time domain with non-linear survival waves
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• Time domain with non-linear survival waves
• Coupled cable dynamics
• Multiple hydrodynamic interaction and articulations (up to
50 structures)
• Transfer of motions and pressures to ANSYS FE models
ANSYS AQWA - Applications
• Determination of RAOs
• Wave bending moments
• Splitting force calculations for semi-submersibles
• Design and analysis of mooring systems
• Time history of motions
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• Time history of motions
• Determination of air gaps
• Calculation of shielding effects of ships and barriers
• Multiple-body interactions
• Coupled mooring line-structure interaction
• Cable dynamics with intermediate buoys
• TLP tether analysis
Modelling in AQWA - elements
• Diffracting or non-
diffracting panels
• Morison elements
– TUBE
– STUB
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– STUB
– DISC
• Point masses
• Mixed models
Modelling in AQWA - connections
• Moorings
– Linear springs
– Elastic catenaries
– Intermediate buoys
– Tethers
– Pulleys
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– Pulleys
• Fenders
• Articulations
• Stiffness matrix
Modelling in AQWA - environment
• Waves
– Regular / irregular
– Time history
• Current
• Wave Spectra
– Pierson-Moskowitz
– JONSWAP
– Gaussian
– User-defined
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– Uniform
– Profile
• Wind
– Uniform
– Spectra
– Time history
– Cross-swell
• New for 14.0
– Multiple simultaneous spectra
– Interaction between spectra
from different directions
Radiation / Diffraction
• Multiple structures including
hydrodynamic interaction
• Hydrodynamic coefficients
(added mass and damping)
• RAOs
• Drift coefficients (Near / far field,
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• Drift coefficients (Near / far field,
full QTF matrix)
• Shear Force / Bending Moment
• Splitting forces
• Pressure distribution for
transfer to FE
• New for v14.0
– Linearised tube dragVideo\Ship&Box.avi
Load Transfer
• Calculation and transfer of hydrodynamic loads to ANSYS for structural analysis
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AQWA Pressure plot
ANSYS Pressure plotImages courtesy of Vuyk
Engineering Rotterdam
Equilibrium and Stability
• Computes static
equilibrium position for
multiple environmental
and mooring
configurations
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• Preliminary mooring
design
• Calculates static /
dynamic stability
• Video\Librium.avi
Frequency Domain
• Significant motions at low frequency and/or wave frequency
• Permits rapid analysis using linearisedparameters of mooring
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parameters of mooring systems
• Graphs for response spectra / RAOs & other parameters
• Wave spreading and 2D spectra
Time-history
• Time-history analysis of multiple structures with regular or irregular waves
• Convolution of radiation forces
• Can use full QTF matrix for shallow water conditions
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shallow water conditions
• Import of wave height time history
• Input of forces via user-defined dll
• Output of motions and forces
• Graphical and animation results
Time-history animation
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Cable Dynamics
• Additional cost item for
more rigorous
simulation of mooring
line behaviour
• Provides full coupled
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• Provides full coupled
vessel/mooring line
analyses
• Included in all modules
except AQWA-LINE
Excel interface
• AQWA specific functions add-in for Excel for
data and results retrieval, processing and
report generation
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Traditional Graphical Interface
• Automatic mesh generation
from lines plans
• Results presentation
• Graphical manipulation of
results
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results
• Export to spreadsheet
• Function processing e.g.
Nodal RAOs
Fourier transforms
• Model checking
Hydrodynamics in Workbench
• Hydrodynamic Diffraction and Hydrodynamic
Time Response represent an ANSYS
Workbench implementation of the ANSYS
AQWA hydrodynamic software
• Provides a common look and feel across the
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• Provides a common look and feel across the
ANSYS product suite
• Provides for future interoperability with other
physical models in the ANSYS product suite,
e.g., ANSYS Mechanical and ANSYS CFD
The ANSYS Workbench
simulation process
ANSYS
DesignModelerCAD
ANSYS
Hydrodynamic
Diffraction
ANSYS
Hydrodynamic
Time Response
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Hydrodynamics in Workbench
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Surface and Pressure Plots
• Animated Surface Plots
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Model definition
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Results Graphs
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Hydrodynamics in Workbench
• What it currently provides (Release 14.0):
– Import of geometry from ANSYS DesignModeler
– Interactive data modification and editing
– Native meshing
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– Diffraction/radiation analysis
– Definition of moorings, fenders and joints
– Definition of environment
– Graph plotting
– Wave surface and pressure contour plots
Key Differentiators
• Integrated (diffraction/radiation, time & frequency
domain, regular & irregular waves,)
• Full hydrodynamic interaction
• Ability to add .DLL with external forces (e.g. DP
system)
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• Up to fifty connected structures
• Integration into ANSYS Workbench
• Modelling flexibility
• Coupled cable dynamics
• Proven over 30 years of use
• Ability to transfer pressures and motions to Finite
element analysis
ANSYS AQWA
The end
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Thank you