The Influence of Aerodynamics on the Design of High-Performance Road Vehicles

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1 The Influence of Aerodynamics on the Design of High-Performance Road Vehicles Guido Buresti Department of Aerospace Engineering University of Pisa (Italy) 1

2 CONTENTS ELEMENTS OF AERODYNAMICS AERODYNAMICS OF CARS AERODYNAMICS OF HIGH-PERFORMANCE CARS DESIGN TOOLS AERODYNAMICS AT FERRARI AUTO CONCLUSIONS AND FUTURE DEVELOPMENTS 2

3 Elements of Aerodynamics AERODYNAMIC FORCES 3

4 Elements of Aerodynamics THE AERODYNAMIC FORCES ACTING ON A BODY IN MOTION IN A FLUID DEPEND ON: GEOMETRY OF THE BODY MOTION OF THE BODY SHAPE DIMENSIONS DIRECTION VELOCITY CHARACTERISTICS OF THE FLUID INTERFERENCE WITH OTHER BODIES 4

5 Elements of Aerodynamics Origin of the forces: V Friction over the body surface Pressures on the body surface F L = Lift 1 2 D 2 Drag Coefficient F = ρv S C C D = 1 2 F ρv D 2 S D Lift Coefficient F = ρv S C L F D = Drag C L = 1 2 F ρv L 2 S L 5

6 Elements of Aerodynamics Boundary layers At the wall the relative velocity between fluid and body is zero and a boundary layer develops But if the Reynolds number Re is high the thickness of the boundary layer may be very small VL Re = ρ µ δ 6

7 Elements of Aerodynamics Boundary layer separation If the curvature of the wall is excessive separation may occur 7

8 Elements of Aerodynamics Aerodynamic classification of bodies Aerodynamic bodies: Boundary layer attached over all their surface Thin and generally steady wakes Bluff bodies: Boundary layer separates from their surface Wide and generally unsteady wakes 8

9 Elements of Aerodynamics Examples of Aerodynamic bodies 9

10 Elements of Aerodynamics Examples of Bluff bodies 10

11 Elements of Aerodynamics The complete equations of motion (Navier-Stokes equations) are non-linear and very complex However, Prandtl showed that δ px (, δ) px0 (, ) and that outside the boundary layer a simple equation of motion applies ( potential flow equation) r 2 φ = 0 with V = φ Inside the boundary layer the equations of motion may be simplified, even if they remain non-linear 11

12 Elements of Aerodynamics For aerodynamic bodies a simplified procedure may then be devised for the evaluation of the aerodynamic loads This is not possible for bluff bodies! Solution of Navier-Stokes equations or experimental data 12

13 Elements of Aerodynamics Drag forces on aerodynamic and bluff bodies FD 2 12ρV L 13

14 Elements of Aerodynamics Flow around an aerodynamic body 14

15 Elements of Aerodynamics Flow around a bluff body 15

16 Elements of Aerodynamics Pressures on bluff bodies C D = 2 C D = 1.2 Wake flow of two-dimensional bluff body 16

17 Elements of Aerodynamics The aerodynamics of bluff bodies is often not obvious C D = 1.8 C D = 0.9 It is important to understand physics in order to control it! 17

18 Aerodynamics of cars All cars are bluff bodies but not all with the same bluffness! 18

19 Aerodynamics of cars For all road vehicles: The spent power is linked to the aerodynamic drag and depends on the cube of velocity P = F V = ρv S C D D To decrease the aerodynamic drag implies Decreasing the frontal area Decreasing the drag coefficient 19

20 Aerodynamics of cars Influence of Drag Coefficient on velocity 20

21 Aerodynamics of cars Aerodynamic Drag Force and necessary power with increasing velocity S = 2.1 m 2 C D = 0.35 V (km/h) F D (Kg) P (HP)

22 Aerodynamics of cars Influence of Drag Coefficient on acceleration 22

23 Aerodynamics of cars Brief historical overview Jamais Contente of Camille Jenatzy (1899) Alfa Romeo of Count Ricotti (1913) 23

24 Aerodynamics of cars Brief historical overview The combined aerodynamic shapes of Paul Jaray (1921) 24

25 Aerodynamics of cars Brief historical overview Adler-Trumpf 1.5 liter (1934) 25

26 Aerodynamics of cars Brief historical overview The ideal automobile shape of Schlör (1938) 26

27 Aerodynamics of cars Brief historical overview K5 of Kamm (1938) C D =

28 Aerodynamics of cars Brief historical overview Mercedes-Benz SSK of Baron König-Fachsenfeld (1932) The record car MG/EX181 (1957) 28

29 Aerodynamics of cars Evolution of C D of cars 29

30 Aerodynamics of cars Evolution of C D of cars 30

31 Aerodynamics of cars The Morel bodies 31

32 The Morel bodies Base flow with concentrated vortices 32

33 The Morel bodies 33

34 Aerodynamics of cars The same phenomenon may occur also for cars C D = 0.55! 34

35 Aerodynamics of cars In the 70s several cars were Morel bodies 35

36 Aerodynamics of cars But then the lesson was learned 36

37 Aerodynamics of cars Evolution of C D of cars 37

38 Aerodynamics of cars Anyway Certain cars were found to have a higher C D than expected Investigation to understand the reason 38

39 Effect of afterbody rounding Analysed problem: Axisymmetrical body ending with different radius of curvature, r/d - Measurement of forces and pressures 39

40 Effect of afterbody rounding C D Natural trans. Forced trans r/d 20 m/s U = 50 m/s r/d A maximum of drag exists for a certain value of r/d The phenomenon depends on geometrical and flow parameters 40

41 Aerodynamics of cars Also in this case the lesson has been learned 41

42 Aerodynamics of cars One of the present cars with lower C D C D =

43 Aerodynamics of cars Prototypes of cars with C D < 0.2 C.N.R. Prototype Fioravanti Flair Prototype 43

44 Aerodynamics of cars Several present production cars have C D

45 Aerodynamics of high-performance cars High engine power V max > 300 km/h Necessity of assuring high and safe global performance For high-performance cars it is essential that the vertical aerodynamic force be not directed upwards 45

46 Aerodynamics of high-performance cars The grip of the tyres is proportional to the downward force acting on them (weight ± aerodynamic force ) If the grip decreases: Indeed: - The breaking space increases - The maximum admissible turning velocity decreases 46

47 Aerodynamics of high-performance cars Effect on breaking space 47

48 Aerodynamics of high-performance cars Effect on maximum admissible turning velocity 48

49 Aerodynamics of high-performance cars In general cars tend to be lifting bodies (upward vertical aerodynamic force) This may cause even beautiful cars to become potentially dangerous 49

50 Aerodynamics of high-performance cars Aerodynamic Design Goals: High downward aerodynamic forces (negative lift) High efficiency (low drag) Negative C z Balance between front and rear wheels C x as small as possible The increase of the vertical download generally causes an increase in drag 50

51 Aerodynamics of high-performance cars Generation of Aerodynamic Download Added devices: wings, spoilers, etc. High and concentrated load Interference with the style and increased drag 51

52 Aerodynamics of high-performance cars Wing wake drag 52

53 Aerodynamics of high-performance cars Generation of Aerodynamic Download The whole car may be used to generate the download Body The design of the upper part of the car may be used to generate the required download producing the minimum amount of drag Underbody An appropriate design of the underbody allows high aerodynamic performance to be obtained without interfering with the style - A rough uncovered underbody slows the airflow and does not allow the lower part of the car to be used to generate a download. - A smooth faired underbody improves the airflow, increases the download and reduces the drag. - A smooth faired underbody modelled with a diffuser accelerates the airflow below the vehicle and further improves the aerodynamic performance. 53

54 Aerodynamics of high-performance cars SCHEME OF AERODYNAMIC DESIGN Aerod. Specifications Style Definition of the Body Shape Aerodynamic Development of the Underbody 54

55 The Influence of Aerodynamics on the Design of High-Performance Road Vehicles - Part 2 Guido Buresti Department of Aerospace Engineering University of Pisa (Italy) 1

56 CONTENTS ELEMENTS OF AERODYNAMICS AERODYNAMICS OF CARS AERODYNAMICS OF HIGH-PERFORMANCE CARS DESIGN TOOLS AERODYNAMICS AT FERRARI AUTO CONCLUSIONS AND FUTURE DEVELOPMENTS 2

57 Design Tools Experimental techniques Specific wind tunnels for automotive research 3

58 Experimental Techniques The Ferrari Gestione Sportiva wind tunnel 4

59 Experimental Techniques The Ferrari Gestione Sportiva wind tunnel 5

60 Experimental Techniques The Ferrari Gestione Sportiva small wind tunnel 6

61 Design Tools Numerical techniques Numerical solution of the equations of fluid dynamics (Navier-Stokes equations) Basic method : Direct Numerical Simulation (DNS) For typical application conditions DNS is not possible! Reynolds-averaged Navier-Stokes equations (RANS) 7

62 Numerical Techniques Reynolds-averaged Navier-Stokes equations (RANS) Commercial codes are used (FLUENT, STAR-CD) Computing times: from a few hours to several days according to complexity of configuration and available computational resources Good qualitative results, and even quantitative, if codes are validated with experimental data for the analysed class of bodies A good aerodynamic competence is necessary Good for comparisons between different configurations Good indications on physical phenomena 8

63 Examples of RANS numerical results 9

64 Examples of RANS numerical results 10

65 Examples of RANS numerical results 11

66 Examples of RANS numerical results Analysis of download of a front F1 airfoil with varying distance from the ground C L h/c 12

67 Examples of RANS numerical results Discretization of vehicle and computational grid 13

68 Examples of RANS numerical results Velocity magnitude 14

69 Examples of RANS numerical results Pressures Streamlines 15

70 Examples of RANS numerical results 16

71 Examples of RANS numerical results 17

72 Aerodynamics at Ferrari Auto Aerodynamic evolution of Ferrari production cars Data Cx Cz

74 Aerodynamics at Ferrari Auto Underbody and aerodynamic coefficients of F360 Modena Ant: C = - Z Z Post: C X X =

75 Cooperation between DIA and Ferrari Auto Since 1989 Characterization of new wind tunnel Solution of specific design problems Involvement of DIA in the development and utilization of new design tools Since General agreement DIA - Ferrari: DIA is reference for research and innovation in aerodynamics DIA directly cooperates in the design of new cars Working tools: Graduation theses on research topics of interest for Ferrari Research contracts on specific problems 21

76 Cooperation between DIA and Ferrari Auto DIA cooperated in the aerodynamic design of: Enzo

77 Cooperation between DIA and Ferrari Auto Some topics: Particular measurement methods Direct measurement of vorticity Surface visualization Basic investigations of common interest Wall effects in wind tunnels Effects of afterbody rounding Aerodynamics of wheelhouses Common research project Development of a numerical procedure for the optimized preliminary aerodynamic design of new cars 23

78 Aerodynamics of wheelhouses Type of Flow Strong coupling with underbody 24

79 Aerodynamics of wheelhouses Nomenclature Ceiling front fillet Ceiling Ceiling rear fillet Back wall Front ramp Rear ramp 25

80 Aerodynamics of wheelhouses Different types of wheelhouse were analysed for different car attitudes relative to the ground 26

81 Aerodynamics of wheelhouses Wind tunnel test campaign 27

82 Aerodynamics of wheelhouses RESULTS Modifications to the geometry of wheelhouses were devised which provided significant improvements A strong correlation exists between wheelhouse geometry and underbody aerodynamics An improvement of the wheelhouses implies a careful analysis of the flow on the car underbody, specially of the outflow from the front wheelhouse 28

83 Optimized aerodynamic design Objective of an aerodynamic optimization procedure: To devise a NEW GEOMETRY OF THE CAR MINIMIZING AN OBJECTIVE FUNCTION linked to the car aerodynamic performance TAKING A SERIES OF CONSTRAINTS INTO ACCOUNT: Geometrical (style) Aerodynamic Technological 29

84 Optimized aerodynamic design Scheme of an optimization procedure Geometric Description Output Final Geometry and Loads Loads Optimization code Solver code Mesh Grid generator Optimization Loop 30

85 Optimized aerodynamic design The evaluation of the aerodynamic loads must be repeated many times The aerodynamic solver must be unexpensive as regards computational time, but sufficiently accurate It is impossible (for the moment) to use codes for the solution of the Navier-Stokes equations (even RANS) Modified potential methods 31

86 Optimized aerodynamic design Potential methods Are much less expensive than RANS methods, but in principle may be applied only to aerodynamic bodies However Investigations carried out by DIA showed that they may be used also for car shapes if the flow is attached until the body rear base and if the effect of the separated wake is adequately taken into account The wake is modelled as a suitable continuation of the body (wake model) 32

87 Optimized aerodynamic design 33

88 Optimized aerodynamic design The car surface is divided in two parts forebody base Computational body A fictitious afterbody is evaluated, using the wake model The computational body is: the forebody + the fictitious afterbody 34

89 Optimized aerodynamic design A WIND TUNNEL EXPERIMENTAL CAMPAIGN WAS CARRIED OUT TO VALIDATE THE PROPOSED SIMPLIFIED LOAD EVALUATION PROCEDURE The shape and dimensions of the model were such that it could be considered a normal production car in 1:2.5 scale 35

90 Optimized aerodynamic design Validation of the computational code c p 1 Experimental HIPEROAD y x (mm) The comparison is very good The agreement extends to the end of the body, showing that the wake model works adequately 36

91 Optimized aerodynamic design Validation of the optimization procedure OBJECTIVE FUNCTION : VERTICAL LOAD CONSTRAINTS: Maximum aerodynamic drag Maximum displacement (3 cm in real scale) The potential code with wake model was used THE WHOLE OPTIMIZATION PROCEDURE REQUIRED A ONE DAY WORK 37

92 Optimized aerodynamic design Comparison between original and optimized models Original Model Optimized Model 38

93 Optimized aerodynamic design Validation results Wind tunnel experimental data Basic Geometry Optimized Geometry C z C x Load 280 Km/h F z = - 28 kg F x = kg 16 cm x 1.5 m Wing 3 HP 39

94 Optimized aerodynamic design The aerodynamic optimization procedure has been introduced in the standard design process of the new Ferrari production cars Style proposal (Pininfarina) Analysis with optimization procedure (Ferrari) Modification proposals New style proposal Model construction and wind tunnel tests Approval 40

95 Conclusions The synthesis of all the Ferrari aerodynamic know-how Ferrari Enzo C z

96 Conclusions The cooperation between DIA and Ferrari has produced: Increase in the Ferrari internal know-how and consequent direct involvement of Ferrari in the styling process of the new production cars Introduction at DIA of new basic aerodynamic research activities with applications in the automotive industry Opening of new occupational perspectives for graduated students The expected future: Increased direct involvement of DIA in the design process of new production cars New interesting research topics 42

97 Conclusions A good aerodynamic design requires: High basic and specific aerodynamic competence Search for physical comprehension Capitalization of acquired know-how Integrated design (team work): Clear and realistic definition of the aerodynamic specifications and of the technological and style constraints Strong interaction between aerodynamic, style and production departments since the initial stages of the design process 43

98 Future developments Some future research topics: Increased know-how on the use of CFD (Navier-Stokes solvers) and their introduction in the optimization process Aerodynamics of cooling systems Increased understanding of and development of methods for the useful management of: to produce - base flows (base drag) know-how - locally-separated flows and vortical structures to be used - interference effects when needed for new styles Study of non-conventional configurations 44

99 THANK YOU FOR YOUR ATTENTION! 45

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