HS
H. Shahzad
7 records found
1
Pore-resolved direct numerical simulations (DNS) of turbulent flows grazing over acoustic liners with aerodynamically and/or acoustically optimized orifice configurations are presented. The DNS explore a large parameter space, studying various families of orifice geometries, incl
...
Pore-resolved direct numerical simulations (DNS) of turbulent flows grazing over acoustic liners with aerodynamically and/or acoustically optimized orifice configurations are presented. The DNS explore a large parameter space, studying various families of orifice geometries, including the influence of orifice shape, orientation, and the number of orifices. All flow cases show an increase in drag compared to the smooth wall. However, the added drag can be reduced by as much as approximately 55% as compared to conventional acoustic liners by simply altering the shape of the orifice or its orientation, in the case of a noncircular orifice. Complementary acoustic simulations demonstrate that this reduced drag may be achieved while maintaining the same noise reduction properties over a wide range of frequencies.@en
We present pore-resolved direct numerical simulations (DNS) of turbulent flows grazing over acoustic liners with aerodynamically and/or acoustically optimised orifice configurations. Our DNS explore a large parameter space, studying different families of orifice geometries includ
...
We present pore-resolved direct numerical simulations (DNS) of turbulent flows grazing over acoustic liners with aerodynamically and/or acoustically optimised orifice configurations. Our DNS explore a large parameter space, studying different families of orifice geometries including the influence of orifice shape, orientation, and number. All flow cases show an increase in drag compared to the smooth wall. However, the added drag can be reduced by as much as ∼60%, as compared to conventional acoustic liners by simply changing the shape of the orifice or the orientation in the case of a non-circular orifice. Complementary acoustic simulations show that this drag reduction can be achieved while retaining the same noise reduction properties.@en
We present pore-resolved compressible direct numerical simulations of turbulent flows grazing over perforated plates, that closely resemble the acoustic liners found on aircraft engines. Our direct numerical simulations explore a large parameter space including the effects of por
...
We present pore-resolved compressible direct numerical simulations of turbulent flows grazing over perforated plates, that closely resemble the acoustic liners found on aircraft engines. Our direct numerical simulations explore a large parameter space including the effects of porosity, thickness and viscous-scaled diameter of the perforated plates, at friction Reynolds numbers, which allows us to develop a robust theory for estimating the added drag induced by acoustic liners. We find that acoustic liners can be regarded as porous surfaces with a wall-normal permeability and that the relevant length scale characterizing their added drag is the inverse of the wall-normal Forchheimer coefficient. Unlike other types of porous surfaces featuring Darcian velocities inside the pores, the flow inside the orifices of acoustic liners is fully turbulent, with a magnitude of the wall-normal velocity fluctuations comparable to the peak in the near-wall cycle. We provide clear evidence of a fully rough regime for acoustic liners, also confirmed by the increasing relevance of pressure drag. Once the fully rough asymptote is reached, canonical acoustic liners provide an added drag comparable to that of sand-grain roughness with viscous-scaled height matching the inverse of the viscous-scaled Forchheimer permeability of the plate.
@en
The nacelle of aircraft engines is coated with acoustic liners to reduce engine noise. An undesirable effect of these liners is that they increase aerodynamic drag. We study this drag penalty by performing Direct Numerical Simulations of a turbulent boundary layer over an acousti
...
The nacelle of aircraft engines is coated with acoustic liners to reduce engine noise. An undesirable effect of these liners is that they increase aerodynamic drag. We study this drag penalty by performing Direct Numerical Simulations of a turbulent boundary layer over an acoustic liner array at friction Reynolds number, Re τ ≈ 850–2500. We use this simulation to confirm several findings that we recently brought forward using a simpler channel flow setup [1]. We show that acoustic liners lead to high wall-normal velocity fluctuations that can be directly correlated with a modulation of the classical near-wall cycle and to an increase in drag. We also confirm that the acoustic liners act as permeable surface roughness and the non-linear Forchheimer coefficient is the relevant permeability parameter for scaling the drag increase.
@en
We perform direct numerical simulations of turbulent flow at friction Reynolds number Reτ≈ 500 - 2000 grazing over perforates plates with moderate viscous-scaled orifice diameter d+≈ 40 - 160 and analyse the relation between permeability and added drag. Unli
...
We perform direct numerical simulations of turbulent flow at friction Reynolds number Reτ≈ 500 - 2000 grazing over perforates plates with moderate viscous-scaled orifice diameter d+≈ 40 - 160 and analyse the relation between permeability and added drag. Unlike previous studies of turbulent flows over permeable surfaces, we find that the flow inside the orifices is dominated by inertial effects, and that the relevant permeability is the Forchheimer and not the Darcy one. We find evidence of a fully rough regime where the relevant length scale is the inverse of the Forchheimer coefficient, which can be regarded as the resistance experienced by the wall-normal flow. Moreover, we show that, for low porosities, the Forchheimer coefficient can be estimated with good accuracy using a simple analytical relation.
@en
In order to reduce the noise emitted by aircraft engines, the nacelle is coated with acoustic liners. An undesirable effect of these surfaces is that they increase the aerodynamic drag. In the present work, we characterize this type of surface roughness by performing Direct Numer
...
In order to reduce the noise emitted by aircraft engines, the nacelle is coated with acoustic liners. An undesirable effect of these surfaces is that they increase the aerodynamic drag. In the present work, we characterize this type of surface roughness by performing Direct Numerical Simulations of fully resolved acoustic liner geometries. We find evidence of a fully rough regime, whose onset is determined by the value of the viscous-scaled Forchheimer coefficient. Moreover, the intensity of the wall-normal velocity fluctuations at the wall also scales with the viscous-scaled wall-normal permeability, leading to a relation between fluctuations and added drag.
@en
Journal article
(2010)
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B.C.
Arnold
(author),
B.C.
Arnold
(author),
G
Chen
(author),
G
Chen
(author),
G.
Kim
(author),
G.
Kim
(author),
D.
Kong
(author),
D.
Kong
(author),
H.
Park
(author),
H.
Park
(author),
D.
Son
(author),
D.
Son
(author),
S.
Song
(author),
S.
Song
(author),
S.
Jung
(author),
S.
Jung
(author),
B.C.
Hong
(author),
B.C.
Hong
(author),
H.
Kim
(author),
H.
Kim
(author),
J.H.
Kim
(author),
J.H.
Kim
(author),
K.S.
Lee
(author),
K.S.
Lee
(author),
H
Chen
(author),
H
Chen
(author),
S.
Park
(author),
S.
Park
(author),
J.
Kim
(author),
J.
Kim
(author),
M.
Choi
(author),
M.
Choi
(author),
G.
Hahn
(author),
G.
Hahn
(author),
S.
Choi
(author),
S.
Choi
(author),
YH
Choi
(author),
YH
Choi
(author),
J.L.
Goh
(author),
J.L.
Goh
(author),
H.
Jeong
(author),
H.
Jeong
(author),
T.
Kim
(author),
T.
Kim
(author),
J
Lee
(author),
J
Lee
(author),
C.
Jiang
(author),
C.
Jiang
(author),
S
Lee
(author),
S
Lee
(author),
P.I.
Petrov
(author),
P.I.
Petrov
(author),
J.
Williams
(author),
J.
Williams
(author),
M.
Ahmad
(author),
M.
Ahmad
(author),
M.
Ahmad
(author),
I.
Ahmed
(author),
I.
Ahmed
(author),
I.
Ahmed
(author),
M.S.
Asghar
(author),
M.S.
Asghar
(author),
M.S.
Asghar
(author),
M.A.A.
Awan
(author),
M.A.A.
Awan
(author),
M.A.A.
Awan
(author),
I.
Hussain
(author),
I.
Hussain
(author),
I.
Hussain
(author),
M.W.
Khan
(author),
M.W.
Khan
(author),
M.W.
Khan
(author),
S.
Muhammad
(author),
S.
Muhammad
(author),
S.
Muhammad
(author),
D.
Liang
(author),
D.
Liang
(author),
H.
Shahzad
(author),
H.
Shahzad
(author),
H.
Shahzad
(author),
P.M.
Zalewski
(author),
P.M.
Zalewski
(author),
A.E.
David
(author),
A.E.
David
(author),
P
Ribeiro
(author),
P
Ribeiro
(author),
PGR
Silva
(author),
PGR
Silva
(author),
M.
Finger
(author),
M.
Finger
(author),
M.
Finger
(author),
M.
Finger
(author),
A.
Denisov
(author),
A.
Denisov
(author),
V.
Kim
(author),
V.
Kim
(author),
A.
Anisimov
(author),
A.
Anisimov
(author),
B.
Liu
(author),
B.
Liu
(author),
A.J.
Levine
(author),
A.J.
Levine
(author),
V.
Petrov
(author),
V.
Petrov
(author),
M.
Daniël
(author),
M.
Daniël
(author),
J.I.
Hernández
(author),
J.I.
Hernández
(author),
B.
Gómez
(author),
B.
Gómez
(author),
J.
Bos
(author),
J.
Bos
(author),
D.
Campi
(author),
D.
Campi
(author),
M.
Hansen
(author),
M.
Hansen
(author),
J.
Harvey
(author),
J.
Harvey
(author),
H.
Hoffmann
(author),
H.
Hoffmann
(author),
X
Meng
(author),
X
Meng
(author),
R.A.
Loos
(author),
R.A.
Loos
(author),
F.E.
Meijers
(author),
F.E.
Meijers
(author),
M.
Mulders
(author),
M.
Mulders
(author),
L.
Orsini
(author),
L.
Orsini
(author),
E
Perez
(author),
E
Perez
(author),
A.
Sharma
(author),
A.
Sharma
(author),
S.
König
(author),
S.
König
(author),
F.A.
Meier
(author),
F.A.
Meier
(author),
Z.
Chen
(author),
Z.
Chen
(author),
A.J.H.
Herve
(author),
A.J.H.
Herve
(author),
J.
Tao
(author),
J.
Tao
(author),
A.
Sanchez
(author),
A.
Sanchez
(author),
M.
Weber
(author),
M.
Weber
(author),
A.
Schmidt
(author),
A.
Schmidt
(author),
Y.
Chang
(author),
Y.
Chang
(author),
E.
Chen
(author),
E.
Chen
(author),
W.
Chen
(author),
W.
Chen
(author),
A.C.S.
Go
(author),
A.C.S.
Go
(author),
C.
Kuo
(author),
C.
Kuo
(author),
S
Li
(author),
S
Li
(author),
W
Lin
(author),
W
Lin
(author),
J
Wang
(author),
J
Wang
(author),
P.L.T.
Chang
(author),
P.L.T.
Chang
(author),
Y.
Chao
(author),
Y.
Chao
(author),
K.
Chen
(author),
K.
Chen
(author),
Y.
LEI
(author),
Y.
LEI
(author),
S.
Lin
(author),
S.
Lin
(author),
R.
Lu
(author),
R.
Lu
(author),
J
Schumann
(author),
J
Schumann
(author),
C.C.
Wang
(author),
C.C.
Wang
(author),
M.
Wang
(author),
M.
Wang
(author),
M.
Kaya
(author),
M.
Kaya
(author),
M.
Kaya
(author),
M.
Kaya
(author),
Z
Wang
(author),
Z
Wang
(author),
M.O.
Kaya
(author),
M.O.
Kaya
(author),
M.O.
Kaya
(author),
M.O.
Kaya
(author),
N.O.
Sonmez
(author),
N.O.
Sonmez
(author),
N.O.
Sonmez
(author),
N.O.
Sonmez
(author),
T.O.C.
Cheng
(author),
T.O.C.
Cheng
(author),
M.
Hansen
(author),
M.
Hansen
(author),
RR
Brown
(author),
RR
Brown
(author),
J.
Williams
(author),
J.
Williams
(author),
J.P.
Hays
(author),
J.P.
Hays
(author),
A.
Papageorgiou
(author),
A.
Papageorgiou
(author),
A.P.D.
Rose
(author),
A.P.D.
Rose
(author),
A.
khan
(author),
A.
khan
(author),
Z.
Xue
(author),
Z.
Xue
(author),
R.E.
Taylor
(author),
R.E.
Taylor
(author),
J.
Rohlf
(author),
J.
Rohlf
(author),
S
Wu
(author),
S
Wu
(author),
S.
Bhattacharya
(author),
S.
Bhattacharya
(author),
D.V.Q.
Nguyen
(author),
D.V.Q.
Nguyen
(author),
P.
Cox
(author),
P.
Cox
(author),
H
Liu
(author),
H
Liu
(author),
M.
Nikolic
(author),
M.
Nikolic
(author),
J.N.V.
Smith
(author),
J.N.V.
Smith
(author),
M.
Tripathi
(author),
M.
Tripathi
(author),
S.
Schmid
(author),
S.
Schmid
(author),
Z.
Zhang
(author),
Z.
Zhang
(author),
J.H.C.
Hauser
(author),
J.H.C.
Hauser
(author),
X.
Yang
(author),
X.
Yang
(author),
A.
Chandra
(author),
A.
Chandra
(author),
F.
Liu
(author),
F.
Liu
(author),
H
Liu
(author),
H
Liu
(author),
A.
Luthra
(author),
A.
Luthra
(author),
H.
Nguyen
(author),
H.
Nguyen
(author),
B.
Shen
(author),
B.
Shen
(author),
V.
Sharma
(author),
V.
Sharma
(author),
S.C.
Simon
(author),
S.C.
Simon
(author),
J.
Cai
(author),
J.
Cai
(author),
Y.
Ma
(author),
Y.
Ma
(author),
Y.
Yang
(author),
Y.
Yang
(author),
L
Zhang
(author),
L
Zhang
(author),
K.
Zhu
(author),
K.
Zhu
(author),
R.
Zhu
(author),
R.
Zhu
(author),
B.
Akgün
(author),
B.
Akgün
(author),
S.
Wagner
(author),
S.
Wagner
(author),
A.
Chatterjee
(author),
A.
Chatterjee
(author),
S.
Das
(author),
S.
Das
(author),
B.A.
Kreis
(author),
B.A.
Kreis
(author),
Y.
Ge
(author),
Y.
Ge
(author),
VB
Kuznetsov
(author),
VB
Kuznetsov
(author),
X.
Shi
(author),
X.
Shi
(author),
W.
Sun
(author),
W.
Sun
(author),
W.Y.
Teo
(author),
W.Y.
Teo
(author),
Y.
Weng
(author),
Y.
Weng
(author),
S.
Banerjee
(author),
S.
Banerjee
(author),
P.
Bhat
(author),
P.
Bhat
(author),
J.G.
Butler
(author),
J.G.
Butler
(author),
H.Y.
Cheung
(author),
H.Y.
Cheung
(author),
D.M.J.
Dykstra
(author),
D.M.J.
Dykstra
(author),
S.
Guo
(author),
S.
Guo
(author),
L.
feng
(author),
L.
feng
(author),
Y.
Guo
(author),
Y.
Guo
(author),
M.K.P.
Johnson
(author),
M.K.P.
Johnson
(author),
C.
Jones
(author),
C.
Jones
(author),
J.
Kaiser
(author),
J.
Kaiser
(author),
C.O.S.
Lei
(author),
C.O.S.
Lei
(author),
S.A.
Los
(author),
S.A.
Los
(author),
K.A.
Mishra
(author),
K.A.
Mishra
(author),
R.V.
Rivera
(author),
R.V.
Rivera
(author),
S.
Ryu
(author),
S.
Ryu
(author),
Z.
Hu
(author),
Z.
Hu
(author),
S.
Sharma
(author),
S.
Sharma
(author),
R.
Smith
(author),
R.
Smith
(author),
R.A.
Vidal
(author),
R.A.
Vidal
(author),
W.
Wu
(author),
W.
Wu
(author),
J.
Yun
(author),
J.
Yun
(author),
M
Chen
(author),
M
Chen
(author),
Y.
Fu
(author),
Y.
Fu
(author),
J.
Gartner
(author),
J.
Gartner
(author),
B.
Kim
(author),
B.
Kim
(author),
D.
Wang
(author),
D.
Wang
(author),
Y.
MAO
(author),
Y.
MAO
(author),
L.
Kramer
(author),
L.
Kramer
(author),
J.L.
Rodriguez
(author),
J.L.
Rodriguez
(author),
M
Bertoldi
(author),
M
Bertoldi
(author),
J
Chen
(author),
J
Chen
(author),
J.
Haas
(author),
J.
Haas
(author),
K.
Johnson
(author),
K.
Johnson
(author),
M.M.T.
Adams
(author),
M.M.T.
Adams
(author),
MC
Castro
(author),
MC
Castro
(author),
D.
Hofman
(author),
D.
Hofman
(author),
E.
Albayrak
(author),
E.
Albayrak
(author),
S
Qian
(author),
S
Qian
(author),
RO
Briggs
(author),
RO
Briggs
(author),
L.F.K.
Chung
(author),
L.F.K.
Chung
(author),
I
Schmidt
(author),
I
Schmidt
(author),
S.
Sen
(author),
S.
Sen
(author),
J.
Wetzel
(author),
J.
Wetzel
(author),
K.W.A.
Yi
(author),
K.W.A.
Yi
(author),
Z.
Guo
(author),
Z.
Guo
(author),
N.Q.
Tran
(author),
N.Q.
Tran
(author),
Y
Zhang
(author),
Y
Zhang
(author),
S.J.
Sanders
(author),
S.J.
Sanders
(author),
H.H.
Teng
(author),
H.H.
Teng
(author),
T.K.
Bolton
(author),
T.K.
Bolton
(author),
A.
Liu
(author),
A.
Liu
(author),
Z.
Wan
(author),
Z.
Wan
(author),
D.J.
Wright
(author),
D.J.
Wright
(author),
G.
Bauer
(author),
G.
Bauer
(author),
M.
Chan
(author),
M.
Chan
(author),
Y.
Kim
(author),
Y.
Kim
(author),
Y.
Lee
(author),
Y.
Lee
(author),
W
Li
(author),
W
Li
(author),
T.
MA
(author),
T.
MA
(author),
B.
Zhu
(author),
B.
Zhu
(author),
M.
Rudolph
(author),
M.
Rudolph
(author),
S.
Xie
(author),
S.
Xie
(author),
A.
Yoon
(author),
A.
Yoon
(author),
J.H.A.
Mans
(author),
J.H.A.
Mans
(author),
J
Zhang
(author),
J
Zhang
(author),
D.
Sanders
(author),
D.
Sanders
(author),
D.
Claes
(author),
D.
Claes
(author),
J.
Keller
(author),
J.
Keller
(author),
S.
Malik
(author),
S.
Malik
(author),
A
Kumar
(author),
A
Kumar
(author),
A.M.
Gomez
(author),
A.M.
Gomez
(author),
K.L.
Smith
(author),
K.L.
Smith
(author),
L.I.P.
Taylor
(author),
L.I.P.
Taylor
(author),
S.
Won
(author),
S.
Won
(author),
D.K.
Berry
(author),
D.K.
Berry
(author),
J.
Gu
(author),
J.
Gu
(author),
G.F.
Williams
(author),
G.F.
Williams
(author),
N.J.
Adam
(author),
N.J.
Adam
(author),
A.
Hunt
(author),
A.
Hunt
(author),
J.K.
Jones
(author),
J.K.
Jones
(author),
E.A.
Laird
(author),
E.A.
Laird
(author),
A
Fedorov
(author),
A
Fedorov
(author),
A.K.
Hektor
(author),
A.K.
Hektor
(author),
M.T.
Mooney
(author),
M.T.
Mooney
(author),
J.M.M.
Werner
(author),
J.M.M.
Werner
(author),
Z.
XIE
(author),
Z.
XIE
(author),
X
Huang
(author),
X
Huang
(author),
A.J.M.
Lopez
(author),
A.J.M.
Lopez
(author),
N.I.
Ippolito
(author),
N.I.
Ippolito
(author),
M.
Jones
(author),
M.
Jones
(author),
C
Liu
(author),
C
Liu
(author),
H.W.
Yoo
(author),
H.W.
Yoo
(author),
Y.
ZHENG
(author),
Y.
ZHENG
(author),
L.D.
Gross
(author),
L.D.
Gross
(author),
P.
Jindal
(author),
P.
Jindal
(author),
F.
Geurts
(author),
F.
Geurts
(author),
J
Liu
(author),
J
Liu
(author),
L.
Sabbatini
(author),
L.
Sabbatini
(author),
Y.S.
Chung
(author),
Y.S.
Chung
(author),
M.A.
Bhatti
(author),
M.A.
Bhatti
(author),
M.
Yan
(author),
M.
Yan
(author),
S.
Thomas
(author),
S.
Thomas
(author),
T.G.
Watts
(author),
T.G.
Watts
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Lee
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G.
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G.
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G.
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A.
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S.A.
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M.
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M.
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M.C.W.
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M.C.W.
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M.C.W.
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M.M.
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M.M.
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A.
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R.
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J.
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P.I.
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W.
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M.D.
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X.J.A.
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M.F.
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P.L.A.
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I.
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P.
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A.
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R.
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S.
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S.
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S.
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R.
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R.
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R.
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A.
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M.
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M.
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A.
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A.
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S.
Ventura
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S.
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C.
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C.
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C.
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L.
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L.
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S
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M.
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M.
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M.
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M.
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M.
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M.
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S.
Chang
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S.
Chang
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J.
Chung
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J.
Chung
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D.H.
Kim
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D.H.
Kim
(author)
The CMS Hadron Calorimeter in the barrel, endcap and forward regions is fully commissioned. Cosmic ray data were taken with and without magnetic field at the surface hall and after installation in the experimental hall, hundred meters underground. Various measurements were also p
...
The CMS Hadron Calorimeter in the barrel, endcap and forward regions is fully commissioned. Cosmic ray data were taken with and without magnetic field at the surface hall and after installation in the experimental hall, hundred meters underground. Various measurements were also performed during the few days of beam in the LHC in September 2008. Calibration parameters were extracted, and the energy response of the HCAL determined from test beam data has been checked.
@en