flow around flapping wings with open foam at aerodynamics...
TRANSCRIPT
![Page 1: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/1.jpg)
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Flow around flapping wings with Open FOAM
at Aerodynamics, TU Delft
Hester BijlFrank Bos, Hans Bergers, Alex Loeven,
Bas van Oudheusden, Sander van Zuijlen, Aukje
de Boer
![Page 2: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/2.jpg)
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Study complex advanced aerodynamics for future of aerospace
Ups
trea
m/
Fund
amen
tal
Res
earc
h
App
lied
rese
arch
& s
ynth
esis
Applied
Aero
Plasma flow control (separation and
transition),BL
suction
Computational
Aero
Fluid-structure
coupling, Unsteady
flows, Uncertainty
quantif., Data assimilation
Experimental
Aero
Advanced Particle
Image Velocimetry, Unsteady
flows, Aeroacoustics
High-speed
flight
and re-
entry
vehicles
(EXPERT)Flapping
wings, Wind turbines, Aircraft
Future
aircraft,HP-sailplanes
![Page 3: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/3.jpg)
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Flapping wings I : Insects and Delfly -
understand and improve them using simulations-
RoboflyGeneric fly
![Page 4: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/4.jpg)
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Flapping-wing simulations: 2D flow (hovering and forward flight)
Periodic (top) and chaotic (bottom)
wake formation in forward flapping flight
![Page 5: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/5.jpg)
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• Solution of an by system.• Evaluation of times functions.
Create interpolation function s(x) through the known boundary displacements
Interpolation conditions: = known deformation of boundary (control) point
Required:
Mesh deformation with Radial Basis Function interpolation
s(x) = γ jϕ(| x − xb jj=1
nb∑ |)
s(xb j)
bn bnbninn
![Page 6: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/6.jpg)
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Moving airfoil comparing with
original method
Deformed mesh with Laplace smoothing and quaternions
Deformed mesh with RBF
Original
RBF
![Page 7: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/7.jpg)
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Moving airfoil: close up Smooth meshes with RBF
Deformed mesh with Laplace smoothing and quaternions
Deformed mesh with RBF
Original RBF
![Page 8: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/8.jpg)
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Deformed mesh with RBF
Deformed mesh with Laplace smoothing and quaternions
Original RBF
Moving airfoil: close up Boundary layer cells almost unchanged
with RBF
![Page 9: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/9.jpg)
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Flapping-wing simulation: 3D flow
vortex visualization around flapping 3D wing at low (top) and high (bottom) Rossby number
Flapping configurations:•
effect of stroke patterns•
effect of wing planform•
effect of Reynolds number•
effect of rotation (Rossby
nr)•
influence of deviation
![Page 10: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/10.jpg)
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Next : include deformation in the simulation
![Page 11: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/11.jpg)
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Flapping wings II : Galatea
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![Page 12: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/12.jpg)
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Open Foam simulation of undulating fin
![Page 13: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/13.jpg)
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(not yet) Flapping wings III : Wind turbine airfoil and rotor
![Page 14: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/14.jpg)
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Preliminary test on a dummy rotor
Rotor radius 32m, V = 6 m/s, Ω=10rpm
OpenFOAM-1.5-dev :• Periodic boundaries
• k-ω SST turbulence model
• MRFSimpleFOAM: Incompressible NS
with multiple-reference frames
![Page 15: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/15.jpg)
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Full rotor simulations of the wind tunnel model
• Test case :• DU-96-W-180 airfoil
• Radius 1m, cmax =20cm, ctip =6cm
• V=5.98 m/s, Ω=400rpm
• Validation: Open jet wind tunnel and Fluent
• OpenFOAM simulations using MRFSimpleFOAM
![Page 16: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/16.jpg)
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Outlook : Open FOAM !
• Flapping wings : include deformation and clap and fling
• Wind turbine simulations : validate and include fluid-structure interaction, and control
• Plasma flow control : large eddy simulations with special actuation
• FSI in solidification: couple (accurately and efficiently) several domains
• Include uncertainty quantification and data assimilation, ….
![Page 17: Flow around flapping wings with Open FOAM at Aerodynamics ...dutchopenfoamusers.nl/downloads/Hester1.pdf · Flow around flapping wings with Open FOAM at Aerodynamics, TU Delft Hester](https://reader035.vdocuments.us/reader035/viewer/2022062414/5e303d23893f64703c5c0a8d/html5/thumbnails/17.jpg)
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Flow around flapping wings with Open FOAM
at Aerodynamics, TU Delft
Hester BijlFrank Bos, Hans Bergers, Alex Loeven,
Bas van Oudheusden, Sander van Zuijlen, Aukje
de Boer