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TRANSCRIPT
CFD TAU Applications within the Airbus Aerodynamic Design Process
Presentation Voith Engineering Services | October 18 & 19 | 1
TAU User Meeting 18th & 19th October 2011
Process
Daniel Schulzewith contribution of Urs Baumgartl & Tim Onnenberg
� Company Introduction
Content
Presentation Voith Engineering Services | October 18 & 19 | 2
Presentation CeBeNetwork, Oktober 11
� TAU Application Areas
� Examples of TAU Studies
� Overall Conclusions
Paper ServiceMobilityEnergy
Company IntroductionAerospace within the Voith Group
Presentation Voith Engineering Services | October 18 & 19 | 3
Process Services
EngineeringServices
Facility Services America
Industrial Services Asia
Facility Services Europe
Process Industries
Aerospace Road & RailProfessional
Staffing
� Flight Physics
� Structure
Company IntroductionBusiness Units within Voith - Aerospace
Presentation Voith Engineering Services | October 18 & 19 | 4
� Systems, Cabin & Cargo
� Processes, Methods & Tools
� Technical Product Services
� Aerodynamics & Wind Tunnel Testing
� Computational Fluid Dynamics (CFD)
� Flight Dynamics
� Mass Properties
� Component Loads
� Aeroelastics
� UAV Design & Analysis
� Model Prototyping & Manufacturing
Company IntroductionSkill Groups within Voith Aerospace Flight Physics
Presentation Voith Engineering Services | October 18 & 19 | 5
Madrid (ES)
15
Madrid (ES)
15
Germany
Bremen 27
Hamburg 23
Germany
Bremen 27
Hamburg 23
Bristol (UK)
13
Bristol (UK)
13
Company IntroductionFlight Physics Engineers at Various Sites
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1515
Toulouse (F)
5
Toulouse (F)
5 Bangalore (INDIA)
17
Bangalore (INDIA)
17
Voith FPY supports Airbus� Aerodynamic Design for:
• Clean Wing• High-Lift Devices• Fuselage & Tails
Application AreasOverview
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• Fuselage & Tails• Air Systems
� Methods and Tools� Data for Loads
Each application area differs in1. Meshing strategies (dependant on e.g.
components and relevant flight conditions)2. Use of different TAU features
Application AreasClean Wing Design
� Simulation of cruise andlow speed performance
� Prediction of Mach and
Presentation Voith Engineering Services | October 18 & 19 | 8
� Prediction of Mach andlow speed buffet
� Prediction of transitionlocation
TAU with coupled Transition prediction is used to analyse the modified airfoil with regard to
� reducing wave drag
Clean Wing DesignLaminar Airfoil Modification
� reference� modified
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� reducing wave drag
� maintain laminar length
� establish a robust boundary layer- - NCF� NTS
For short range missions the wing has to maintain a long laminar length at a variety
Clean Wing DesignComputation with coupled Transition Prediction
Presentation Voith Engineering Services | October 18 & 19 | 10
CL
• Analysis of cruise performance with regards to transition location• Used within the design process to increase the laminar region
near buffetdesign point
length at a variety of speeds, altitudes and weights.
� Comprehensive 2D studies for shape and setting design in early state of design process
� 3D computations for• Comparison to experimental data
− Calibration of simulation
Application AreasHigh-Lift Design
Presentation Voith Engineering Services | October 18 & 19 | 11
− Calibration of simulation method
− Understanding of flow features• Prediction of flow conditions for
− Differences in lift (and drag) performance
− Stall pattern− Component loads
� Prediction of particle trajectories and impingement
High-Lift Design2D shape and setting design studies
2D TAU SAe computations over representative spanwise sections cover wide range of high-lift shape and setting design in early state of process.
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High-Lift DesignComparison of CFD with Wind Tunnel Results
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Flow phenomena at the vicinity of maximum liftSeparation pattern: onset of tip separation while approaching maximum lift
Particle tracer module was used for trajectory computations. A comprehensive study allowed generic predictions about trajectory dependencies of various parameters:
� Flap deflection (circulation)
High-Lift DesignTrajectory Predictions
light particles
Presentation Voith Engineering Services | October 18 & 19 | 14
� Flap deflection (circulation)� Krueger deployment angle� Particle inertia parameter� Mach number� Angle of attack
heavy particles
TAU Particle Tracer Module
ne
ed
ed
se
ttin
g h
eig
ht
for
shie
ldin
g
10m/s
5m/s
15m/s
20m/s
impact velocity
∆∆∆∆dF
∆∆∆∆Ma
High-Lift DesignTrajectory Predictions (2)
Presentation Voith Engineering Services | October 18 & 19 | 15
TAU Particle Tracer Module
Implementation of parameters• impact angle• impact velocity allowed a more quantitative prediction of impact condition.
� consideration of non critical impingements possible
0 5 10 15 20
ne
ed
ed
se
ttin
g h
eig
ht
for
shie
ldin
g
impact angle
10m/s
5m/s
15m/s20m/s
Application AreasFuselage & Tails Design
3D computations for� Comparison to experimental data
• Calibration of simulation method
Presentation Voith Engineering Services | October 18 & 19 | 16
method• Understanding of flow
features� Prediction of flow conditions for
• Differences in lift, drag and sideforce
• Stall pattern
Objective:� Rear fuselage shaping study to achieve a shape with best suitable aerodynamic characteristics� Actuator disc computations for
Fuselage & Tails DesignRear Fuselage Design Study
cp
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� Actuator disc computations for power effect on rear fuselage and tail planes� Clearance of blade tip to fuselage boundary layer� prediction of flow pattern in the vicinity of prop discs
boundary layer thickness� clearance of blade tip proofed
Visualisation of flow pattern in the vicinity of prop discs
Mac
h
Fuselage & Tails DesignRear Fuselage Design Study (2)
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� clearance of blade tip proofed
boun
dary
laye
r th
ickn
ess
cp
Application AreasAir Systems Design
� Internal (and external) flow computations
� Prediction of drag and thrust recovery
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� Proof of interface flow conditions for internal air systems
� Component Loads
� Prediction of surface temperatures
Air Systems DesignOptimisation of a RAM Air Outlet
OutletInlet
Presentation Voith Engineering Services | October 18 & 19 | 20
MixerBleed Air
Heat Exchanger
Pre-Cooler
50 %230°C, 3bar
~25°C
0°C, ~Cabinpressure
Q=m*∆∆∆∆T*Cp
Outer flow Outer flow
50 %
Modifications at Diffusor and Flap
� Smoothed rearward edge of diffusor� Displacement of cooling-film exhaust
Air Systems DesignOptimisation of a RAM Air Outlet (2)
Presentation Voith Engineering Services | October 18 & 19 | 21
� Increased thrust, increased mass flow� Higher velocities at outlet
� Reduced flap length and angle
� Reduced drag
� Expertise in the whole CFD-Process chain, i.e.CAD Preparation � Mesh Generation � CFD Solution � Analysis
� Meshing with Centaur; mesh generation strategy dependent upon a/c component studied
� Application of Mesh “Module Boxes”� Power On/Off Computations (Engine and/or Actuator Disc)
Overall ConclusionsCFD Expertise and Capabilities based on TAU
Presentation Voith Engineering Services | October 18 & 19 | 22
� Power On/Off Computations (Engine and/or Actuator Disc)� External and Internal Viscous Flow Computations� TAU with coupled Transition Prediction� TAU Particle Tracer Module
� Methods and Tool Development– Process chains for the heterogeneous HPC Cluster of Airbus– TAU development with R&T projects
(e.g. “smooth_taugrid”)– Tools for Aerodata for Loads (e.g. “InvesT”)
Thank you for your attention!
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Presentation Voith Engineering Services | October 18 & 19 | 24