UnsteadyNonlinearSimulationCFDSoftwareRIAMCOMPACTNaturalTerrainVersion

(LESTurbulenceModel)

IndispensableToolforComplexTerrain

SoftwareiscompatiblewithmultiCPUandmultiGPUparallelcomputing

VenturecorporationinitiatedfromKyushuUniversity,JapanRIAMCOMPACTCO.,LTD.www.riamcompact.com

IndispensableToolforComplexTerrain

FASTLESCALCULATIONACCURATEFLOWSIMULATION

FLOWVISUALIZATIONforPRECISETURBINESITINGRIAMCOMPACT(ResearchInstituteforAppliedMechanics,KyushuUniversity,COMputationalPredictionofAirflowoverComplexTerrain),anunsteadynonlinearsimulationCFDsoftware,wasdevelopedspecificallyforaccurateflowsimulation for complex terrain. The software's calculation code is based on the LargeEddy Simulation (LES)turbulencemodel.Afteryearsofdevelopment,thecodehasbeensuccessfullyfinetunedandoptimised.WiththeuseofmultiCPUandmultiGPUparallelcomputing,fastLEScalculationisnowachievable.Terraininducedturbulenceovercomplexterrain isan important issuetoconsiderduringturbine layoutplanning.RIAMCOMPACTfeaturesenhancedflowvisualizationwhichenablesnumericalsimulationresultstobevisualizedinthe formofgraphicalanimations.Excessiveturbulencespotscanbequickly identified.Highwindspeedwith lowturbulence areas suitable forturbine placement can beaccurately determined,makingthis an indispensable tool notjust for turbulence riskassessment but also formaximizing production of yourwindfarm.WHATDOESNONLINEARANDUNSTEADYMEAN?

(a)Unsteadynonlinearmodel(LES),RIAMCOMPACT (b)Steadynonlinearmodel(RANS) Unsteady nonlinearmodels (LES turbulencemodel) such as RIAMCOMPACT simulate thewind flow that weexperienceeveryday.Thewinddisturbancescanbeunderstoodintuitively.Nonlinearmodelsareapplicableforbothflatterrainandcomplexterrainwithsteepslopes.Steadynonlinearmodels(RANSturbulencemodel)simulatethesameresultsbutareaveragedintime.DetailsofthetransientturbulentstructurecanonlybesimulatedbyLES.

WHYRIAMCOMPACT?HighAccuracy CalculationsolverisbasedonLES(LargeEddySimulation)turbulencemodel. LESismoreaccuratethanRANS(ReynoldsAveragedNavierStokes)simulationsforsolvingtransientturbulence

flowsimulation.FastCalculation WiththeuseofIntelmulticoreCPUandNVDIAmultiGPUprocessors,fastcalculationspeedcanbeachieved

evenwithouttheuseofsupercomputers. TheoptimisedLESSolverisabout10timesfasterthanothercommercialsoftware.EasytoUse Onlyafewcalculationparametersarerequiredfromuserinputs. UsersdonotneedtohaveindepthspecializedknowledgeofCFD.FlowVisualization Simulation results in the formofanimationwithawide rangeofvisualization techniquesavailable (velocity

vectors, speed contours, color shading, streamlines, pathlines, streaklines, trajectories of tracked particles,timeline,surfacepathrendering,etc)

UsefulFeatures Userfriendlymeshgenerationengine Acceptsawiderangeofelevationdata(WAsPmapfile,ALOSsatellitetopographydata,etc)afterconversion Timeseriesdataofthethreecomponentsofthewindvelocitycanbeexported. Batchandsimultaneouscalculation SimulationdatacanbeexportedtoGoogleEarth Productionoutputbasedonsimulationresultscanbeestimatedwithwakelossmodelincluded. RIAMCOMPACTsoftwarehasbeenvalidatedagainstwindtunnelexperiments(Bolundislandetc) Therelativeerrortotherealobservationdataofanannualaveragewindspeedwaswithin10%.MultiPlatform OperatesonvariouscomputersystemsfromsingledesktopPCtosupercomputer. CompatiblewithIntelmulticoreCPUprocessorsandNVIDIAmultiGPUprocessors.LEADINGCFDSOFTWAREINJAPANWith over 60 licenses sold mostly in the wind energy sector but also in the nonwind energy sectors.RIAMCOMPACTistheleadingLESbasedCFDsoftwareinJapanforwindenergyapplications.Belowisjustashortsampleofthecustomers. EurusEnergyHoldingsCorporation JPOWER/ElectricPowerDevelopmentCo.,Ltd. JapanWindDevelopmentCo.,Ltd. EcoPowerCo.,Ltd.(COSMOOILCo.,Ltd.) MitsubishiHeavyIndustries,Ltd.

KyushuElectricPower WestJapanEngineeringConsultants,Inc. CTECHCORPORATION TsubasaWindfarmDesign BeijingTsinghuaUniversity,Beijing,China

FASTLESCALCULATIONRIAMCOMPACThasbeenoptimisedtosolve LES equations in a fast andefficient manner. Comparison ofcomputation speeds for simulationsusing 50million grid points under thesame condition are given in the tablebelow.

BoldnumbersindicatethespeedratiowithrespecttoasingleCPUontheSX9F(NECsupercomputer).Numbersinsideparenthesesrepresenttheactualcomputationtime.MemoryUsage:approximately15GB

KEYTECHNICALREFERENCES1. GrahamLi,S.Takakuwa,T.Uchida,ApplicationofCFDforTurbulenceRelatedOperationalRisksAssessmentof

WindTurbinesinComplexTerrain,EWEA20132. T.Uchida,Y.OhyaandK.Sugitani,Comparisonsbetween thewakeofawind turbinegeneratoroperatedat

optimal tip speed ratioand thewakeofa stationarydisk,ModelingandSimulation inEngineering,Volume2011

3. T. Uchida, T. Maruyama and Y. Ohya, New Evaluation Technique for WTG Design Wind Speed using aCFDmodelbased Unsteady Flow Simulation with Wind Direction Changes, Modelling and Simulation inEngineering,Volume2011

4. T.UchidaandY.Ohya,LatestDevelopmentsinNumericalWindSynopsisPredictionUsingtheRIAMCOMPACTCFDModelDesignWindSpeedEvaluationandWindRisk(TerrainInducedTurbulence)Diagnostics inJapan,Energies,Vol.4,pp.458474,2011

Benchmark testing: 3D simulation ofcomplex turbulence field around anisolatedhillNECsupercomputer

5. T.UchidaandY.Ohya,VerificationofthePredictionAccuracyofAnnualEnergyOutputatNomaWindParkbytheNonStationaryandNonLinearWindSynopsisSimulator,RIAMCOMPACT,JournalofFluidScienceandTechnology,Vol.3,No.3,pp.344358,2008

6. T.UchidaandY.Ohya,MicrositingTechniqueforWindTurbineGeneratorbyUsingLargeEddySimulation,J.WindEng.Ind.Aerodyn.,Vol.96,pp.21212138,2008

Pleasevisitthecompanyhomepageforacompletelistofreferences.APPLICATIONSofRIAMCOMPACT

Wakesimulationincomplexterrain

Sitingandannualoutputpredictionincomplexterrain

APPLICATIONSofRIAMCOMPACT

Predictionofairflowpastrealurbanarea

RIAMCOMPACTisdevelopedbyDr.TakanoriUchidaAssociateProfessor(DirectorofRIAMCOMPACTCO.,LTD.)ResearchInstituteforAppliedMechanics(RIAM),KyushuUniversityFukuoka,JapanEmail:takanori@riam.kyushuu.ac.jpRIAMCOMPACTisdistributedbyGrahamLiFounderandChiefArchitectTsubasaWindfarmDesign,Tokyo,JapanTel:818023792899Email:rc@twdwind.comURL:www.twdwind.com

(a)Fr=(nonstratifiedflow)

(b)Fr=1(stablystratifiedflow)Predictionofadvectionanddispersionofvolcanicgases

(Miyakeisland)

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