rd
3ANSA&μETAInternationalConference
September9-11,2009OlympicConventionCentre,PortoCarrasGrandResortHotel,HalkidikiGreece
AdetailedCAEframeworkispresentedinthispaperwhichhasbeenemployedtoperform
DesigndevelopmentstudiesonaGMautomotivevehicleforbetteraerodynamic
performance.ThemeshingandmorphingcapabilitiesofANSAaredemonstratedby
performinga3factorparametricshapedevelopmentstudyoftherearendofapassenger
vehicle.DesignsforanL4orthogonalarraywerecreatedbymorphingthebaselinemesh
model.TheANSABatchMeshmanagerfacilitatedgenerationofSurfaceMesh,Boundary
LayersandVolumeMeshinanautomaticmanner,savingconsiderableamountofmodeling
time.TheMorphingtoolandtheOptimizationTaskutilityprovidednecessarytoolstodefine
andsimulatecomplexshapechanges.TheOptimizationTaskcanalsousedtogenerate
necessarydesignvariationsinbatchmode,eliminatingtheneedforuserinteraction,which
canfacilitateeasyintegrationofANSAwithexternaloptimizationsoftwareforDOEand
Optimizationstudies.Duringsignificantshapechanges,themeshcanoftendeform
significantlyaffectingitsquality.Forsuchcases,theintegratedenvironmentinANSA
providesallnecessarytoolstofixthemeshqualityorregeneratethemeshlocally.ANSA’s
meshingandmorphingtoolscanbeeffectivelyusedtodevelopCFDmodelsandtheirdesign
variationswithminimaleffort.Thebaselinemodelandthedesignvariationswere
subsequentlyanalyzedforaerodynamicperformance.Aerodynamicdragandliftcoefficients
werecomputedtocreateadatabaseforstatisticalpostprocessing.
TheCAEframeworkdiscussedinthispaperincorporatestheusageofapre-processorwith
anintegratedenvironmentofmeshingandmorphingtomakenecessaryshapechangesand
statisticalanalysistoguidethedesigndevelopmentprocess.Suchaframeworkminimizes
thenumberofiterationsrequiredtodevelopanoptimumdesignandconsequently,reduces
thedesigndevelopmenttimeandcost.
REFERENCES
(1)KOJIMA,Y–MechanicalCAEinAutomotiveDesign,R&DReviewofToyota
CRDL,Vol.35,No.4
(2)http://www.edmunds.com/advice/fueleconomy/articles/106954/article.html
(3)GENERALMOTORS–2005/2006CorporateResponsibilityReport,
http://origin.gm.prod.gmgssm.com/corporate/responsibility/reports/06/400_products/1
_ten/410.html
(4)CAMPOS,F.,GEREMIA,P.,SKAPERDAS,E.-AutomaticOptimizationof
nd
AutomotiveDesigns,Proceedingsof2ANSA&METAInternationalCongress,
2007,Thessaloniki,Greece
(5)SINGH,R-AutomotiveAerodynamicDesignOptimizationProcessforAutomotive
Vehicles,SAECongress,2003,Detroit,USA
(6)HUCHO,W-AerodynamicsofRoadVehicles,SAEInternational,1998,Detroit,
USA
(7)BETACAESYSTEMSS.A.-ANSAv13.0.1UsersGuide
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