WaveDyn - GL Garrad Hassan

Renewable energy consultantsV1.0WaveDynWave energy converter dynamicsWAVE ENERGY CONVERTER DESIGN SOFTWARE

Wave GL energy Garrad Hassan converter performance and loading design toolWaveDyn is an integrated software package for the design of waveenergy converters. It provides users with a fully coupled design tool thathas been validated with a wide range of concepts under commercialand R&D projects. A flexible, multi-body modelling approach allowsperformance and loading calculations to be conducted for a numberof wave energy converter types; the structure of the simulation modelbeing defined using a range of constituent components.WaveDyn offers a Windows-based graphical user interface andsupports calculations of combined structural, hydrodynamic and appliedloads, such as those induced by power conversion mechanisms (powertake-off, or PTO) and mooring systems. It has been validated with datafrom multiple types of wave energy converter, floating and bottomstanding, with single and multiple body structures, and with point-absorber,attenuator (head-on) and terminator (beam-on) orientations. WaveDynhas also benefited from extensive verification and validation exercisesconducted under the £8m PerAWaT project (Performance Assessmentof Wave an Tidal Array Systems), commissioned and funded by the ETI.Multibody structural dynamics• Self-consistent and rigorous multibody formulation• Nonlinear Lagrangian model• Centrifugal and Coriolis effects accounted for• Large systems, any number of degrees-of-freedom• Floating elements, joints, masses and links• Rigid structures (V1.0)• Flexible structures*Power Take-Off (PTO) & Control• Explicit models and real system templates• Linear and nonlinear formulations• Motion, force and moment constraints• Incorporation of internal PTO dynamic states• Built-in actuation, rectification and smoothing system models• Control logic, controller demands, transducer signals*• Independent discrete time controller DLL interface*• Direct drive template*Moorings• Catenary systems and tension legs• Quasi-static formulation based on nonlinear force-displacement look-uptables• Mooring line damping forces• Verified against fully dynamic models and validated with experimentaldataSoftware validationWaveDyn has been validated against scale model data for attenuator,point absorber and oscillating wave surge converter machines, both withcommercial partners and as part of independent research and developmentprogrammes. Single machine and small array tests have been completedas part of the PerAWaT project and full-scale machine validation is alsounderway, bringing the greatest possible level of confidence to WaveDyn’smodelling capability.Although WaveDyn is new, it benefits from nearly 30 years of GLGarrad Hassan experience in developing fully coupled engineeringmodels. Synergies with the wind energy standard design tool Bladedinclude the sharing of the multibody structural dynamics engine, whichprovides a solid foundation for consistently reliable and accurate results.WaveDyn V1.0 core features include::..............................................................................................................A time-domain simulation environment with combined structural,hydrodynamic, power take-off and moorings modelling capability. Avariable timestep integrator provides optimal simulation run-times..............................................................................................................The ability to input a wide range of wave conditions, from measuredsea states to parameterised spectral shapes (including directionalspectra)..............................................................................................................A multibody structural dynamics solver, which allows the user to buildmultibody structures of different type and form, matching the physicallayout of the real machine..............................................................................................................Detailed specialist modules that allow all the key loads to be fullycoupled with the structural model (hydrodynamics, PTO, moorings)..............................................................................................................Nonlinear formulation, including real system templates able to applymotion, force and moment constraints, and incorporate internal PTOstates..............................................................................................................A Windows-graphical user interface with all core pre andpost-processing features, and an on-line help facility..............................................................................................................The PerAWaT models, courtesy of the ETI and WaveBob Ltd.Waves• Regular and irregular waves• Irregular wave inputs can be constructed to allow simulation ofwaves from measured spectra or standard spectral shapes(Pierson-Moskowitz, Bretschneider, JONSWAP)• Run multiple simulations and weight results to obtain energy yieldestimates in a local wave climate• Input a sea-state description based on measured tank data to runsimulations using reconstructed free-surface elevation timeseriesPre-processing• Visualisation of the wave energy converter structure using dynamic2D tree diagrams• Visualisation of numerical flow solver meshPost-processing & graphics• Global response: motion and velocities• Time series of absorbed and output power• Breakdown of hydrodynamic, PTO and moorings loads in the system• Frequency response analysis from regular and irregular wave results*• Capture width calculation*• Power matrix creation*Support and trainingAfter sales support and maintenance includes telephone and email supportand incremental upgrades to the software. GL Garrad Hassan will alsoprovide changes to the software to meet a user’s specific requirements.Such changes will be provided on a commercial basis. Training courses arealso available.*Coming in future releases as part of the support and maintenance feespackage.The PerAWaT models, courtesy of the ETI and Pelamis Wave Power Ltd.System requirementsWaveDyn is designed to run on PC computers running Windows XP or later:• 1GHz or faster processor• Microsoft® Windows® XP with Service Pack 3 (32 bit and 64 bit**) orhigher• 512MB of RAM (2GB recommended)• 2GB of available hard-disk space. SCSI or FC disk recommendedWaveDyn is already being used by a variety of wave energy technologydevelopers and is widely applicable to the majority of devices currentlyin development. A number of calculation modules are available allowinga release to be tailored to the needs of each user and particular attentionhas been given to developing accurate, fully coupled models of keysubsystems such as the PTO and the moorings systems. Reporting andpost-processing tools are also part of the base version.**WaveDyn runs on both 32-bit and 64-bit operating systems (OS).If you intend to run WaveDyn on a work station that will just have oneinstance of WaveDyn running then we recommend 32bit OS.If you intend to run WaveDyn on a dedicated application server withseveral instances of WaveDyn running in parallel, a 64bit OS with around8GB RAM is recommended.Request a demonstrationHydrodynamics• Inclusion of first-order hydrodynamic loads• Diffraction, radiation and nonlinear hydrostatics• Processing of flow solver data output including internal calculation ofthe impulse response function• Dedicated plug-ins to couple with commercial flow solversProject management• Use project files to store and share wave energy converter modeldefinitions• Use calculation records to repeat and verify earlier work• Quality check of simulations results using flexible plotting facility• Manage batch calculations*For further information about WaveDyn and its individualmodules, please visit www.gl-garradhassan.com. If youwould like to try a demonstration version, please contactour WaveDyn team by emailing:wavedyn@gl-garradhassan.com

All information correct at time of print September 2012www.gl-garradhassan.com