How to carry out fundamental research together with...
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HOW TO CARRY OUT FUNDAMENTAL RESEARCH
TOGETHER WITH INDUSTRY
Lars Davidson
Division of Fluid Dynamics
Dept. of Mechanics and Maritime Sciences (M2)
Chalmers
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APPLIED AND FUNDAMENTAL RESEARCH
I will show five nice examples of fundamental research carried outtogether with industry
◮ Water droplets/ruvulets on side mirrors◮ Heat transfer in engines: exp & simulation◮ External windnoise disturbing driver and passengers (automotive)◮ Using active flow control for reducing drag on vehicles◮ Heat transfer in engines: development of simulation method
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WATER: VOLVO CARS, FFI PROJECT, 2006-2011
Water inlet
U∞
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WATER: EXPERIMENT
(A) Scatter plot. Air velocity Vair = 13 (B) Different air velocities.
FIGURE: Velocity of waterdrops that left the table.
ρℓhcVair
σ= −155 + 280Vair
T. Tivert and L. Davidson Experimental study of water transport on a generic mirror, InternationalConference on Multiphase Flow,ICMF, Tampa, FL, US, 2010.
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ENGINES: VOLVO CARS, FFI PROJECT, 2009-2014
Real engine
Simplified case
Piston top simplified as a
series of horizontal and
inclined plans
Impinging jet flow and heat
transfer
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ENGINES: EXP & SIMULATIONS
(A) Setup (B) Computational domain
FIGURE: Simplified setup
M. Bovo and L. Davidson “Direct comparison of LES and experiment of a single-pulse impingingjet”, International Journal of Heat and Mass Transfer, Vol. 88, pp. 102-110, 2015.
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ENGINES: RESULTS
(A) Velocities at three instants.
Ve
locitie
sa
tth
ree
insta
nts
Surface temperature
wall normal velocity, 0.6ms
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ACOUSTICS, VOLVO & VCC, FFI PROJECT 2014-2018
Winds reen
A-pillar
Plenum
Du k tail
Hood
Side mirror
Side window
Beltline
x
y
z
side mirrorCavity
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AERO-VIBRO ACOUSTICS: FFI PROJECT 2014-2018
An important source of the interior noise in vehicles is the window vibration that
is excited by
◮ the exterior flow (indirect noise generation).◮ the exterior flow-induced noise (direct noise transfer).
Boundary layer
Noise from
Vortices
Structure
Noise due to Noise due tohydrodynamicacoustic
Exterior side
Interior side
vortices
pressure pressure
Vibration
Noise fromboundary layer
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APPLICATION 1 – GENERIC SIDE-VIEW MIRROR (1)
The exterior turbulence creates interior noise by making the window glass vibrate
1.4
0.8
0.2
0.2
1.61.4
1.2
0.1
1.2
0.1
0.1 0.1
X
Y
Z
Glass window
GSV Mirror
Rigid plate
Cavity
(A) Domain with mirror, glass window
and cavity.
Pressure of interior noise
Generic side view mirror
Glass window
Cavity
Vortices
Pressure on window
(B) CFD, vibrating window, noise
propagation in cavity.
H.-D. Yao & L. Davidson, “Generation of interior cavity noise due to window vibration excited byturbulent flows past a generic side-view mirror”, Phys. Fluids, Vol. 30, 036104, 2018
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APPLICATION 1 – GENERIC SIDE-VIEW MIRROR (2)
Compressibility: compressible vs. incompressible.
Turbulence modeling: detached eddy simulation vs. large eddy simulation.
Acoustics: direct vs. indirect simulation using acoustic perturbation equations.
Grid topologies: trimmed vs. polyhedral cells.
X
Z
(a)
(b)
7
6
5
4 3 2 1
Trimmed mesh
X
Z
(a)
(b)
X
Y
Polyhedral mesh
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APPLICATION 1 – GENERIC SIDE-VIEW MIRROR (3)
The contributions of the exterior hydrodynamic and acoustic pressure
fluctuations to the interior noise generation are addressed.
0.05 0.12 0.19 0.26 0.33 0.4
C-LES
I-DES with polyhedral meshI-DES with trimmed mesh
C-DES
0.3 0.6 0.9 1.2 0.3 0.6 0.9 1.2
x x
0.6
0.3
0
-0.3
-0.6
0.6
0.3
0
-0.3
-0.6
z
z
(A) RMS values of surface pressure
fluctuations
(a)
(b)
(B) SPLs of interior noise at Mic. 4
(bottom corner)
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APPLICATION 2 – FULL-SCALE TRUCK (1)
The installation effect of a side-view mirror is studied.
The simplification strategy for a full-scale production truck is validated.
(a)
(b)
Original and simplified trucks
X
Z
YX
Y
Z
Window
Upper mirror head
Bottom mirror head
Mirror bracket
Window
Upper mirror head
Bottom mirror headMirror bracket
A-pillar
Side-view mirror components, the A-pillar and the window
H.-D. Yao & L. Davidson, “Simplifications Applied for Simulation of Turbulence Induced by a SideView Mirror of a Full-Scale Truck Using DES”, SAE 2018-01-0708, 2018.H.-D. Yao, L. Davidson, Z. Chroneer, “Investigation of interior noise from generic side-view mirrorusing incompressible and compressible solvers of DES and LES”, SAE 2018-01-0735, 2018.
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APPLICATION 2 – FULL-SCALE TRUCK (2)
A hybrid mesh of trimmed and polyhedral cells is employed.
The mesh is sufficiently refined near the mirror and A-pillar to resolve turbulent
flow structures.
X
Y
Z
(a)
(b)
X
Y
Z
A hybrid mesh of trimmed & polyhedral cells
X
Z100
-120
-340
-560
-���
-����
(Pa)
X
Y
Snapshots of Q-criterion
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AERODYNAMICS: AB VOLVO, FFI PROJECT 2013-2018
A−pillar
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Uinf
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Uinf
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Uinf Jet
Uinf
Membrane
Time
Jet
0
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Jet
Uinf
Membrane
Time
Jet
0
D
LW
S
W
K
A
z
y
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Uinf
Uinf
D
AC
y/W
x/W
x
BA
BR
L
0.5
1
1 1.6
domain
y
z
domain
Laser
Camera
Side
Rear
AFC
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G. Minelli, E. Adi Hartono, V. Chernoray, L. Hjelm and S. Krajnovic “Aerodynamic flow control fora generic truck cabin using synthetic jets”, Journal of Wind Engineering and IndustrialAerodynamics, Vol. 168, pp. 81-90, 2017.
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AFC OFF AFC ON
G. Minelli, S. Krajnovic, B. Basara and B. Noack, “Numerical Investigation of Active Flow ControlAround a Generic Truck A-Pillar”, Flow, Turbulence and Combustion, Vol. 97, pp. 1-20, 2016.
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ENGINES: AB VOLVO, FFI PROJECT ON-GOING
FIGURE: Internal engine combustion of mixture of air and direct injecteddiesel.
piston
valves
spray
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IMPINGING JET
FIGURE: Turbulent axisymmetric impinging jet.
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TEST CASE
USED MESH TYPES
Mesh for low-Reynolds-
number, LRN, modelingMesh for Numeric
Wall Function, NWF
Mesh for high-Reynolds-
number, HRN, modeling
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WALL FRICTION
FIGURE: Impinging jet at ReD = 220000, comparing; : default LRN,
: LRN with NWF mesh, face flux, : wall flux.
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SPEED-UP
0 1,000 2,000 3,000
Wall flux
Face flux
LRN w NWF mesh
HRN
LRN
313
3,470
493
652
624
Steady-state solver time [s]
J.-A. Backar, L. Davidson, “Evaluation of numerical wall functions on
the axisymmetric impinging jet using OpenFOAM”, International
Journal of Heat and Fluid Flow, Volume 67, pp. 27-42, Part A, 2017.L. Davidson, FFI, April 2019 Applied and Fundamental 23 / 25
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AFC AND MACHINE LEARNING
Project leaders: S. Krajnovic and V. Chernoray
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Left: A sketch of the flow separation
Right: The model placed in the wind tunnel
Object: teach the controller to miminize drag by finding optimal
A1,A2, f1, f2 in S = A1 sin(2πf1t) + A2 sin(2πf2t)
Learning procedure is based on a genetic algorithm (GA)
optimization script
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APPLIED AND FUNDAMENTAL RESEARCH: HOW TO
There is a danger that very applied FFI projects get higher priority
than fundamental research
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APPLIED AND FUNDAMENTAL RESEARCH: HOW TO
There is a danger that very applied FFI projects get higher priority
than fundamental research
How to combine applied & fundamental research?
L. Davidson, FFI, April 2019 Applied and Fundamental 25 / 25
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APPLIED AND FUNDAMENTAL RESEARCH: HOW TO
There is a danger that very applied FFI projects get higher priority
than fundamental research
How to combine applied & fundamental research?◮ Choose the right partner (persons) in industry
L. Davidson, FFI, April 2019 Applied and Fundamental 25 / 25
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APPLIED AND FUNDAMENTAL RESEARCH: HOW TO
There is a danger that very applied FFI projects get higher priority
than fundamental research
How to combine applied & fundamental research?◮ Choose the right partner (persons) in industry◮ In a project: do both fundamental research (first) and then apply it
(maybe by your industrial partner)
L. Davidson, FFI, April 2019 Applied and Fundamental 25 / 25
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APPLIED AND FUNDAMENTAL RESEARCH: HOW TO
There is a danger that very applied FFI projects get higher priority
than fundamental research
How to combine applied & fundamental research?◮ Choose the right partner (persons) in industry◮ In a project: do both fundamental research (first) and then apply it
(maybe by your industrial partner)◮ Go out and visit the industry; make presentations.
L. Davidson, FFI, April 2019 Applied and Fundamental 25 / 25