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AIAA4thDragPredic0onWorkshopJune20‐21,2009,SanAntonio,TX
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U.Goldberg,O.Peroomian,V.Akdag,V.Gupta,S.ChakravarthyMetacompTechnologies,Inc.,
andR.Ranjan,A.Singh,A.Khare,K.Nikam
Computa0onalResearchLaboratories,Ltd.,Pune,India
AIAA4thDragPredic0onWorkshop
CORRESPONDINGPARTICIPANT’SINFORMATION
Name:Dr.UrielGoldbergEmail:[email protected]:(818)735‐4880ext.225Address:MetacompTechnologies,Inc.Address:28632BRoadsideDrive#255Address:AgouraHillsAddress:CA91301‐6071
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AIAA4thDragPredic0onWorkshop
Contents• Solverinforma0on
• Computedcases
• Gridinforma0on
• Solu0onplaMorms
• Sampleofresults
• Summary
AIAA4thDragPredic0onWorkshop
SOLVERINFORMATION
• METHODNAME:CFD++So`wareSuite.• BASICALGORITHM:finitevolumeunstructured
mixed‐elementcell‐based.• TURBULENCEMODELS:(1)wall‐distance‐freerealizablek‐ε
(incl.eme‐scalerealizability),(2)S‐A.• Tu=2.0%,μt/μ=3.0.• RESIDUALS:Basedonabsolutevaluesumoverallcells,
dividedbythenumberofcells.Residualsareavailableforallequaeonsseparately.
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AIAA4thDragPredic0onWorkshopTESTCASES(NASACRMconfiguraeon,freeair,fullyturbulent)
(1.1)GridconvergencestudyatM=0.85,CL=0.500±0.001• Tailincidenceangle=0• Coarse,medium,fine,extra‐finegrids• Rec=5×106basedoncREF=275.80”• TREF=100°F(1.2)DownwashstudyatM=0.85• UseMediumgrid• Dragpolarsatα=0.0,1.0,1.5,2.0,2.5,3.0and4.0°• Tailincidenceangles:‐2.0,0.0and+2.0°• Notail• Trimmeddragpolarderivedfrompolarsat‐2.0,0.0and+2.0°• Δdragpolaroftailonvs.tailoff• Rec=5×106basedoncREF=275.80”• TREF=100°F• Momentref.center:XREF=1325.90”,ZREF=177.95”(2.0)Machsweep:M=0.70,0.75,0.80,0.83,0.85,0.86,0.87• Mediumgrid• WBHiH=0• Cl=0.400,0.450,0.500
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AIAA4thDragPredic0onWorkshopGridsizes(1/2model)
Gridinforma0on
• GRID‐GENERATORNAME:MIME(Mule‐purposeIntelligentMeshingEnvironment).
• GRIDTYPE:Mixedelements.Prismlayersaregrownfromallsurfacesoftheaircra`,transieoningtotetrahedralelementswithinthevolume.Inthetransieonzonebothhexahedralandpyramidelementscanappear.
• BL1stcellsize:5.08X10‐5m(y+<1)• BLmax.growthrate:1.235
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Config. Coarsest Coarse Medium Fine ExtraFine
WB 17.0M
WBH 11.5M 16.6M 22.7M 28.6M 33.9M
AIAA4thDragPredic0onWorkshopSOLUTIONINFORMATION
Twocompuengplarormswereused:(1)forpreliminarycalculaeonsandCL‐driver‐basedgridsensievityassessment(Task1.1)and(2)forpreparaeonofpolarsandMachsweepdata(Tasks1.2&2.0).
Plarorm1
• COMPUTERPLATFORM:clusterofLinux‐basedmachines.Eachmachinehas2dual‐coreAMDOpteronprocessors.
• INTERCONNECTION:infiniband‐based.• NO.OFPROCESSORS:8machines(32CPUs).• OPERATINGSYSTEM:Kernel2.6.9(SMP)ofLinuxfromRedHat.• COMPILER:GNUC‐compiler.• RUNTIMEWALL‐CLOCK:about8hoursfor400iteraeons(22.7Mcells).• MEMORYREQUIREMENTS:79GB(22.7Mcells)
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AIAA4thDragPredic0onWorkshopPlarorm2
• COMPUTERPLATFORM:Clusterof1800computenodes,eachcontainingdualIntelXeonquadCoreE5365,3.0GHzprocessors,.16GBmemoryand72GBHarddisk.
• INTERCONNECTION:4XDDRInfiniband,Bandwidthof20Gbpsbidireceonal.
• NO.OFPROCESSORS:14400Cores(7200CPUs).• OPERATINGSYSTEM:XC‐3.2.1withlatestupdates• COMPILER:GNUC‐compiler.• EKADetails:Thesystemhasapeakcomputecapacityof
180teraflopsandhasachievedsustainedcomputecapacityof132.8teraflopsfortheLINPACKbenchmark.
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AIAA4thDragPredic0onWorkshop• Sampleresults(1)
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AIAA4thDragPredic0onWorkshop• Sampleresults(2)
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AIAA4thDragPredic0onWorkshop• Sampleresults(3)
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AIAA4thDragPredic0onWorkshop• Sampleresults(4)
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AIAA4thDragPredic0onWorkshop• Sampleresults(5)
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AIAA4thDragPredic0onWorkshop• Sampleresults(6)
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Wing:suceonside,finemesh
AIAA4thDragPredic0onWorkshop• Sampleresults(7)
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Wing:suceonside,finemeshTail:suceonside,finemesh
AIAA4thDragPredic0onWorkshop• Sampleresults(8)
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Wing/fuselageseparaeonbubble
AIAA4thDragPredic0onWorkshop• Sampleresults(9):TypicalWBHforcesconvergence
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AIAA4thDragPredic0onWorkshop• Sampleresults(10):Cpprofiles(S‐A&k‐ε)
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Y=5my=10.874m
η=0.397
AIAA4thDragPredic0onWorkshop• Sampleresults(11):Cpprofiles(S‐A&k‐ε)
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Y=25m
AIAA4thDragPredic0onWorkshop• Sampleresults(12):Gridconvergencestudy(1.1)
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AIAA4thDragPredic0onWorkshop• Sampleresults(13):Gridconvergencestudy(1.1)
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AIAA4thDragPredic0onWorkshop• Sampleresults(14):Polarplots(1.2)
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AIAA4thDragPredic0onWorkshop• Sampleresults(15):Polarplots(1.2)
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AIAA4thDragPredic0onWorkshop• Sampleresults(16):Polarplots(1.2)
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AIAA4thDragPredic0onWorkshop• Sampleresults(17):Machsweep(2.0)
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AIAA4thDragPredic0onWorkshopSummary
• MIMEusedtogenerate5hierarchicalgrids
• CFD++usedtocomputeCases1.1,1.2,2.0• Mostsolu0onsgeneratedbyCRLIndia• ResultspresentedwithS‐Aandk‐εmodels:
o Gridconvergencesameexceptforcoarsestmesho Wing/fuselage&wingTEsepara0onspredictedbyboth
modelsonallgrids
o Trimmedpolarsbythe2modelsareverycloseo Atα>3o(CDi)k‐ε>(CDi)S‐A