STUDENT LAUNCH INITIATIVE 2011 – 2012 AIAA OC Rocketeers FRR Presentation April 9, 2012
Aiaa 2012 Presentation
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INFLUENCE OF HIGH-LIFT SUPPORTING SYSTEMS ON THE TRAPEZOIDAL WING AERODYNAMIC
COEFFICIENTS
Alexandre P. Antunes Embraer, São José dos Campos, Brazil
Ricardo Galdino da SilvaEmbraer, São José dos Campos, Brazil
João Luiz F. AzevedoInstituto de Aeronáutica e Espaço, São José dos Campos, Brazil
30th AIAA Applied Aerodynamic Conference
New Orleans, Louisiana – 25-28 June 2012
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Outline
� Objectives
� Theoretical and Numerical Formulations
� High-Lift Configuration
� Mesh Generation
� Results
� Conclusions
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Outline
� Objectives
� Theoretical and Numerical Formulations
� High-Lift Configuration
� Mesh Generation
� Results
� Conclusions
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� Build upon previous work but now considering the effects of the
supporting brackets over the aerodynamic coefficients for the
trapezoidal wing.
� Evaluate the effects of a surface and a volumetric mesh refinement
over the aerodynamic coefficients.
Objectives
The main objectives of the present work are:
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Outline
� Objectives
� Theoretical and Numerical Formulations
� High-Lift Configuration
� Mesh Generation
� Results
� Conclusions
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Outline
� Objectives
� Theoretical and Numerical Formulations
� High-Lift Configuration
� Mesh Generation
� Results
� Conclusions
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Theoretical and Numerical Formulation
The numerical simulations are performed using the CFD++ software
considering the RANS formulation (Reynolds-averaged Navier-
Stokes Equations) and the SA and SST turbulence models.
Numerical aspects of the CFD++ software:
• Finite volume cell-based mixed element unstructured
• Inviscid fluxes: multi-dimensional TVD, minmod limiter
• Viscous fluxes: non-decoupling non-limited face polynomials
• Point implicit with multi-grid relaxation for steady state.
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Outline
� Objectives
� Theoretical and Numerical Formulations
� High-Lift Configuration
� Mesh Generation
� Results
� Conclusions
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Outline
� Objectives
� Theoretical and Numerical Formulations
� High-Lift Configuration
� Mesh Generation
� Results
� Conclusions
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High-Lift Configuration
Wind Tunnel Model
The Trap-Wing configuration, tested at NASA Ames
PWT and NASA Langley SWT wind tunnels, is the object of study
in the present work.
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Configuration Flap Spanwise Slat Deflec. Flap Deflec.
01 full 30 25
The simulations are performed for the flight condition given by
Mach number of 0.20 and Reynolds number of 4.3 million (NASA SWT
– experimental test) for configuration one.
High-Lift Configuration
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Outline
� Objectives
� Theoretical and Numerical Formulations
� High-Lift Configuration
� Mesh Generation
� Results
� Conclusions
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Outline
� Objectives
� Theoretical and Numerical Formulations
� High-Lift Configuration
� Mesh Generation
� Results
� Conclusions
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Mesh Generation –Hybrid Meshes
Meshes considering one surface and one spatial refinements.
Coarse Mesh - Baseline
- Mesh size 24.8 million cells
- Y+ around one
- Stretching factor 1.15
- Total number of prismatic layers 46
Medium Mesh – Surface Refinement
- Mesh size 49.3 million cells
- Y+ around one
- Stretching factor 1.15
- Total number of prismatic layers 46
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Fine Mesh – Volumetric Refinement
- Mesh size 69.5 million cells
- Y+ around one
- Stretching factor 1.15
- Total number of prismatic layers 46
Mesh Generation –Hybrid Meshes
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Coarse Mesh
Mesh Generation – w and wt Brackets
No-Brackets Brackets
No-Brackets Brackets
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Coarse Mesh X Medium Mesh
Mesh Generation – w Brackets
Surface refinement
without doubling the
number of surface
elements.
Coarse
Coarse
Medium
Medium
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Fine Mesh X Medium Mesh
Fine Medium
MediumFine
Mesh Generation – w Brackets
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Outline
� Objectives
� Theoretical and Numerical Formulations
� High-Lift Configuration
� Mesh Generation
� Results
� Conclusions
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Outline
� Objectives
� Theoretical and Numerical Formulations
� High-Lift Configuration
� Mesh Generation
� Results
� Conclusions
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The following tables show thesimulations performed.
Results
Previous result.
The flow to be considered asfully turbulent.
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Outline
� Objectives
� Theoretical and Numerical Formulations
� High-Lift Configuration
� Mesh Generation
� Results
� Coarse Mesh
� Medium Mesh
� Fine Mesh
� Conclusions
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Comparison between the results with and without thebrackets for the coarse mesh
Results – Coarse Meshes
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Drag polar comparison for both configurations.
Results – Coarse Meshes
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The integration of the pressure coefficient over the chordwisedirection yields the load distribution. In the mid-span region there isgood agreement between the two configurations.
Results – Coarse Meshes
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Results – Coarse Mesh wt. Brackets
Vorticity iso-surfaces coloredby the magnitude of thevelocity.
AoA = 30 deg.
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Results – Coarse Mesh wt. Brackets
At mid-span region of the wing main element, a massiveflow detachement is observed AoA = 32 deg.
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Results – Coarse Mesh w. Brackets
Vorticity iso-surfaces coloredby the magnitude of thevelocity.
AoA = 16 deg.
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At mid-span region of thewing main element, a massiveflow separation is observed
AoA = 24 deg.
Results – Coarse Mesh w. Brackets
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Outline
� Objectives
� Theoretical and Numerical Formulations
� High-Lift Configuration
� Mesh Generation
� Results
� Coarse Mesh
� Medium Mesh
� Fine Mesh
� Conclusions
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Comparison between the coarse and the medium mesh.
Results – Medium Meshes
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Drag polar for the coarse and medium meshes. An improvement isobserved over the coarse mesh results.
Results – Medium Meshes
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Results – Medium Mesh w. Brackets
Configuration One with brackets
Medium Mesh – Turbulence Model - SAConfiguration One with brackets
Medium Mesh – Turbulence Model - SA
Vorticity iso-surfaces colored by velocity magnitude, AoA = 24 deg.
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Lift coefficient comparison. No hysteresis analysis was conducted inorder to decrease the angle of attack after the maximum achieved CL.
Results – Medium Mesh w. Brackets
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The drag polar indicates a worse comparison of the restartprocedure in relation to the ‘from-scratch’ approach.
.
Results – Medium Mesh w. Brackets
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Results – Medium Mesh w. Brackets
From-Scratch Restart
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Comparison between the SA and the SST turbulence models.
Results – Medium Mesh w. Brackets
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Results – Medium Mesh w. Brackets
Comparison Cp distribution SA X SST @ Eta = 0.17 - AoA =13
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Results – Medium Mesh w. Brackets
Comparison Cp distribution SA X SST @ Eta = 0.65 – AoA = 13
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Results – Medium Mesh w. Brackets
Comparison Cp distribution SA X SST @ Eta = 0.85 – AoA =13
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Results – Medium Mesh w. Brackets
Comparison Cp distribution SA X SST @ Eta = 0.95 – AoA =13
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Results – Medium Mesh w. Brackets
In terms of drag coefficient the two obtained solutions are close toeach other.
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Outline
� Objectives
� Theoretical and Numerical Formulations
� High-Lift Configuration
� Mesh Generation
� Results
� Coarse Mesh
� Medium Mesh
� Fine Mesh
� Conclusions
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Results – Fine Mesh w. Brackets
Not expected...
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Results – Medium Meshes
However, the drag results have a better comparison with theexperimental results.
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• The mesh assumed as coarse presented a very premature stall.
• The surface mesh refinement provided an improvement in theaerodynamic coefficients.
• The volumetric refinement presented an unexpected resultwhich decreased the stall angle of attack and the maximumCL.
• The different turbulence models are generating very differentflow pattern.
• There is a need to continue the studies with a more systematicprocedure to perform the mesh generation.
Conclusions