2011 ANSYS, Inc. September 19, 20131DrivAer - Aerodynamic Investigations for a New Realistic Generic Car Model using ANSYS CFDThomas Frank(*), Benedikt Gerlicher(*), Juan Abanto(**)(*) ANSYS Germany, Otterfing, Germany(**)ANSYS Inc., Lebanon, NH, USAThomas.Frank@ansys.com 2011 ANSYS, Inc. September 19, 20132Contents The DrivAer Benchmark by TUM, Inst. Aerodynamics Investigated DrivAer car model variants The meshing process CFD investigations for the DrivAer fastback car: F_S_woM_wW F_D_wM_wW Comparison to TU Munich wind tunnel data Cross-comparison of ANSYS CFX and ANSYS Fluent Summary & Outlook 2011 ANSYS, Inc. September 19, 20133Objectives Automotive AerodynamicsValidation of ANSYS CFD Generic reference model with modern car geometry Investigation of meshing process and technologies for contemporary and complex car body geometry Including wheels Including mirrors Including detailed floor with exhaust system Validation of ANSYS CFX & ANSYS Fluent Comparison to TU Munich wind tunnel data Turbulence model validation and data comparison steady/transient SST and SAS-SST 2011 ANSYS, Inc. September 19, 20134DrivAer GeometryDevelopment of the DrivAer model by TU MunichBMW 3 SeriesLimousineAudi A4LimousineCourtesy by TU Munich, Inst. of Aerodynamics 2011 ANSYS, Inc. September 19, 20135DrivAer GeometryDevelopment of the DrivAer model by TU MunichBMW 3 SeriesLimousineAudi A4LimousineDriveAer Car BodyCourtesy by TU Munich, Inst. of Aerodynamics 2011 ANSYS, Inc. September 19, 20136DrivAer GeometryDevelopment of the DrivAer model by TU MunichTotal length 4613mmTotal !"th 1#20mmTotal he!ght 141#mm$heelba%e 2mmTrac' !"th (ront 1520mmTrac' !"th bac' 152&mmCourtesy by TU Munich, Inst. of Aerodynamics 2011 ANSYS, Inc. September 19, 2013&Experimental Facility and Data The experimental data is provided by the Institute of Aerodynamics and Fluid Mechanics, TU Munich Experiments are performed in a wind tunnel including a moving belt @ 1:2.5 model scaleCourtesy by TU Munich, Inst. of Aerodynamics 2011 ANSYS, Inc. September 19, 2013#Test Case Conditions)o"el Scale 1:2.5Inlet *eloc!t+ 40 m,%A!r Temperat-re 20A!r .re%%-re 1.013 barA!r /en%!t+ 1.204& 'g,m30e(erence 1ength 21ength o( car mo"el3 1.#4 m0e%-lt!ng 0e+nol"% n-mber 4.#&41065ro-n" *eloc!t+ 40 m/sCourtesy byTU Munich, Inst. of Aerodynamics 2011 ANSYS, Inc. September 19, 20139Investigated DrivAer Car ModelsES!oM!oWEs"a"eSmoo"# under$ody!i"#ou" Mirrors!i"#ou" W#ee%s&S!oM!W&as"$a'(Smoo"# under$ody!i"#ou" Mirrors!i"# W#ee%s&D!M!W&as"$a'(De"ai%ed under$ody!i"# Mirrors!i"# W#ee%s 2011 ANSYS, Inc. September 19, 201310Investigated DrivAer Car ModelsES!oM!oWEs"a"eSmoo"# under$ody!i"#ou" Mirrors!i"#ou" W#ee%s&S!oM!W&as"$a'(Smoo"# under$ody!i"#ou" Mirrors!i"# W#ee%s&D!M!W&as"$a'(De"ai%ed under$ody!i"# Mirrors!i"# W#ee%s 2011 ANSYS, Inc. September 19, 201313Geometry & Computational DomainDimensions o) "#e Boundin* Bo+)o"el %cale 1 6 1 1 6 1Total length 101 46.13 mTotal !"th 117 20.02 mTotal he!ght #8 11.34 m)o"el Scale to 9ar S!:e 1:1Inlet *eloc!t+ 16 m,%A!r Temperat-re 20A!r .re%%-re 1.013 barA!r /en%!t+ 1.204& 'g,m30e(erence 1ength 29ar 1ength3 4.60e%-lt!ng 0e+nol"% n-mber 4.#&41065ro-n" *eloc!t+ 1, m/s 2011 ANSYS, Inc. September 19, 201314Meshing Process Meshing process using: ANSYS DesignModeler 14.5 ANSYS TGrid in Fluent 14.5ANSYS /)5eometr+ 9lean-pT5r!" )e%h!ngI5;S 9A/ 5eometr+ANSYS /) .ag"b 5eometr+ ;