powerflow analysis dlr-f11 configuration · consideration on measured polar shape from: application...
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PowerFLOW Analysis DLR-F11 Configuration
HiLiftPW-2 San Diego – 2013
Benedikt König André Ribero Ehab Fares Swen Nölting
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Overview
Introduction Lattice Boltzmann Method
Grid Convergence Study
Reynolds Number Study – Impact of Laminar/Turbulent Transition
General Flow Analysis
Comparison Config 4 vs Config 5
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Overview Simulations
Description Low Reynolds High Reynolds
Case 1 - 16° (c/m/f)
Case 2 a/b 19° -
Case 3 a/b 0°-22° 0°-23.5°
Case 3 a/b with Transition 16°, 19° 16°, 19°
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Lattice Boltzmann Method
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Lattice Boltzmann Method
Simulations performed with Lattice Boltzmann
based solver PowerFLOW 5.0 beta – D3Q19 LBM
Cubic cells (Voxels)
Surface elements (Surfels)
– Fully transient – Turbulence Model: LBM-VLES
Modified RNG k-ε model for unresolved scales
Swirl model
Extended wall model
– LTT Model Automatically determines transition locations
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Lattice Boltzmann Method Grid Scheme
Cartesian Grid
Voxel/Surfel concept
with cut cells
no surface fitted grid
required
Automatic and robust
grid generation process
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Grid Refinement Study – Refinement ratio 1.4
Reynolds Number Study – medium-equivalent grid used
Lattice Boltzmann Method Case Setups
Voxels [106]
Resolution Refine Ratio
Number Total Voxels Ratio
Runtime per 0.1sec(*) Space [mm] Time [sec]
Coarse 90.3 0.23 6.0x10-7 1.4 2.26 0.6d
Medium 214.6 0.16 4.2x10-7 1.4 2.37 1.6d
Fine 545.7 0.11 3.0x10-7 1.4 2.54 4.2d
Voxels Resolution Runtime per 0.1sec(*) Space [mm] Time [sec]
280 x 106 0.14 3.9 x 10-7 1.9d
(*) simulated physical time on 560 cores Intel Sandybridge 2.7GHz
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Lattice Boltzmann Method Example – Vorticity
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Gird Convergence Study
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Grid Convergence Study Lift
Asymptotic convergence not yet reached
Trend lines (for t > 0.25 sec) indicate that for
longer runtimes picture will change
1 l.c.
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Grid Convergence Study Drag and Pitching Moment
Asymptotic convergence achieved for drag
Pitching moment similar to lift, still showing
slow trends
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Grid Convergence Study Cp-Distributions
• On inboard wing even coarse grid delivers converged solutions
• Very good agreement to experimental data
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Grid Convergence Study Cp-Distributions
• On outboard wing some unsteady effects occur with fine resolution no grid convergence
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Grid Convergence Study Unsteadiness at Higher Resolution
Surface pressure variation Cp(t2)-Cp(t1) on fine grid
t1 t2 Significant unsteadiness on fine grid
t1 t2
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Reynolds Number Study
Config 5
Results
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Reynolds Number Study Lift Polar
• Reynolds trends captured well except for polar shape difference between low and high Reynolds numbers in WT
1. CL under-predicted laminar/turbulent 2. Lift slope under-predicted and variation
not captured effect of half-model testing? (compare peniche effect)
3. Delayed stall (due to under-predicted lift?)
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Reynolds Number Study Drag Polar
• Reynolds trend for drag well captured
1. Very good agreement at low CL 2. Over-predicting drag around Clmax (partly
due to laminar/turbulent transition)
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Reynolds Number Study Pitching Moment Polar
• Very good agreement both absolute and for Reynolds trend
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Reynolds Number Study Pressure Distributions
Pressure distributions at
Alpha= 7°,16°,21° are
shown
Inboard (PS02) and
outboard (PS08) sections
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Reynolds Number Study Pressure Distributions – Alpha = 7deg
inb
oar
d
ou
tbo
ard
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Reynolds Number Study Pressure Distributions – Alpha = 16deg
inb
oar
d
ou
tbo
ard
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Reynolds Number Study Pressure Distributions – Alpha = 21deg
inb
oar
d
ou
tbo
ard
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Reynolds Number Study
with Laminar/Turbulent Transition
Results
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Transition Study Pressure Distributions – Alpha = 16deg
Not converged yet
Inclusion of laminar/turbulent transition significantly
improves CL levels, especially at low Reynolds number
Work in progress
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Transition Study Pressure Distributions – Alpha = 16deg
Re
= 1
.35
M
Re
= 1
5.1
M
• Accounting for laminar regions improves agreement significantly, in particular for the Low-Re
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Flow Analysis and Comparison to Experiment
Low Reynolds Number
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Flow Visualization Surface Flow – Alpha = 7deg
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Flow Visualization Surface Flow – Alpha = 7deg
PowerFLOW, fully turbulent
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Flow Visualization Surface Flow – Alpha = 18.5deg
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Flow Visualization Surface Flow – Alpha = 18.5deg
• Positions of main separations well predicted • Separation size slightly under-predicted
PowerFLOW, fully turbulent
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Flow Visualization Surface Flow – Alpha = 18.5deg
PowerFLOW, Transition
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Flow Visualization Surface Flow – Alpha = 21deg
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Flow Visualization Surface Flow – Alpha = 21deg, fully turbulent
• Positions of main separations well predicted • Separation size under-predicted
Flow separation missing completely
PowerFLOW, fully turbulent
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Velocity Profiles Inboard Wing
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Velocity Profiles Outboard Wing – Flap
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Comparison Config 4 vs Config 5
Results
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Comparison Config 4 vs Config 5 Overview – Re = 1.35m
Differences between Config 4 and 5 are smaller
than overall differences to experiment
Should still be a valid comparison
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Comparison Config 4 vs Config 5 Surface Stream Lines – Alpha = 19deg
Config 4 Config 5
The flow separation driving the wing stall is missing on Config 4 Pressure tube bundles are crucial to predict stall correctly
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Comparison Config 4 vs Config 5 Total Pressure in the Stall Region – Alpha = 19deg
Config 4
Slat
Config 5
Begin flow separation
Slat
Pressure tube bundle
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Comparison Config 4 vs Config 5 X-Vorticity in the Stall Region – Alpha = 19deg
Config 5 Config 4
Slat Slat
Pressure tube bundle
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Conclusions
General – Good agreement with experimental pressure distributions – Significant dependency on laminar/turbulent transition – Stall mechanism well predicted but separation too small stall delayed
Resolution Study – Reasonable grid convergence achieved for AoA=16deg
impacted by unsteady flow
Reynolds Study – Reynolds Trends captured well
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Next Steps
Run Grid Sensitivity Study at AoA=7deg
Investigate dependency of stall on – Laminar/turbulent transition
Investigate WT effects – WT walls – Peniche
Optimize grids – for low and high Reynolds numbers separately
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Acknowledgement
We are grateful for support in conduction the
simulations from
McGill University, Montreal, Canada
Purdue University, West Lafayette, IN
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Thank You!
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Additional Slides
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Consideration on Measured Polar Shape
From: Application of Advanced CFD Tools for High Reynolds Number Testing, S. Melber-Wilkending and G. Wichmann, DLR, AIAA 2009-0418
• Overall the peniche height has an influence, which can potentially not be fully corrected for
• Especially at lower Reynolds Numbers the polar shape can change due to the peniche