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Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen 1) , M. Rakowitz 1) , M. Sutcliffe 2) 1) DLR, Institute of Aerodynamics and Flow Technology, Braunschweig, Germany 2) Airbus Deutschland, Bremen, Germany

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Page 1: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 1

2nd AIAA Drag Prediction Workshop

TAU Results

O. Brodersen1), M. Rakowitz1), M. Sutcliffe2)

1) DLR, Institute of Aerodynamics and Flow Technology, Braunschweig, Germany2) Airbus Deutschland, Bremen, Germany

Page 2: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 2

Numerical Method

• DLR-TAU software solves RANS equations

• Node-centered, hybrid grids, dual grids

• Various discretization schemes, turbulence models

• Grid adaptation

• Acceleration techniques, vectorized, parallelized

• Grids generated with Centaur from Centaursoft

• TAU was developed in the German MEGAFLOW project

Page 3: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 3

Case 1: Influence of Grid Density

Page 4: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 4

Case 1: Influence of Grid Density

Page 5: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 5

Case 1: Influence of Grid Density

Page 6: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 6

Case 1: Influence of Grid Density

Page 7: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 7

Case 1: Influence of Grid Density

Page 8: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 8

Case 1: Influence of Grid Density

Nacelle pressure distribution

60o

Page 9: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 9

Case 1: Influence of Grid Density

Nacelle pressure distribution

180o

Page 10: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 10

Case 1: Influence of Grid Density

Nacelle pressure distribution

300o

Page 11: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

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Case 1: Influence of Grid Density

Page 12: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 12

Case 1: Influence of Grid Density

∆CD extrapolated

+0.9%+1.0%elsA

-2.4%-2.3%TAU

WBNPWBCode

elsA (ICEM grids used;grids not suitable for grid refinement !)

Page 13: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

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Case 1: Flow Phenomena→ Geometry influences trailing edge separation

Recirculation

Trailing edge separation

Flow around pylon

Page 14: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 14

Case 1: Flow Phenomena→ Geometry influences trailing edge separation

Recirculation

Trailing edge separation

Flow around pylon

Page 15: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 15

Case 1: Flow Phenomena

Page 16: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 16

Case 1: Flow Phenomena

Separation

Page 17: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 17

Case 1: Flow Phenomena

Separation

Page 18: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 18

Case 1: Flow Phenomena

Separation

Page 19: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 19

Case 2: Drag Coeffcients

Page 20: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 20

Case 2: Moment Coefficients

Page 21: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 21

Case 3: Comparison with transition / fully turbulent

Page 22: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 22

Case 3: Comparison with transition / fully turbulent

1.6329.0330.6WBNP

5.3282.1287.4WB

∆CDCD

Turb.CD

Trans.Conf.

Page 23: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 23

Case 3: Comparison with transition / fully turbulent

Page 24: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 24

Case 4: Mach Drag Rise

Page 25: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 25

DLR-F6 Cases: Installation drag(AIAA-Journal Vol. 39, No. 6, Nov-Dec 2002)

L1

L3

L2

2.33.0L2 – L311.810.7L1 – L2

TAUExp.CD-Install.

Page 26: 2nd AIAA Drag Prediction Workshop TAU Results · Brodersen , Rakowitz, Sutcliffe 1 2nd AIAA Drag Prediction Workshop TAU Results O. Brodersen1), M. Rakowitz1), M. Sutcliffe2) 1) DLR,

Brodersen , Rakowitz, Sutcliffe 26

Summary• Hybrid method (TAU & Centaur) is able to predict drag for DLR-F6 withina range of 5-8% (CL=0.5)

• Grid adaptations are necessary to reduce discretization errors• Flow phenomena have to be computed correctly to ensure drag prediction• Trailing edge geometry of DLR-F6 has an influence on wing upper side

flow separations• Wing lower side transition is of importance• Drag differences of 1-2 dc can be computed when errors are systematic• Remaining questions: transition, trailing edge effects


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