Advances in Structural Engineering,
Journal Year:
2023,
Volume and Issue:
26(16), P. 2963 - 2983
Published: Sept. 28, 2023
The
aerodynamic
characteristics
of
twin-separated
parallel
decks
for
long-span
rail-cum-road
bridges
with
various
wind
barriers
clamped
at
railway
girder
are
more
complicated
because
interference.
Experimental
investigations
on
coefficient
and
pressure
coefficients
twin
girders
under
different
incoming
flow
directions
were
conducted
using
tunnel
tests.
Three
heights
(
H)
varying
from
2
m
to
4
four
ventilation
ratios
R)
20%
50%
examined.
Results
indicated
that
the
affected
significantly
by
direction,
which
must
be
considered,
barrier
when
it
is
located
both
upstream
downstream,
but
laws
not
same.
Due
interference
effect
girders,
adjacent
highway
also
along
girder,
especially
downstream.
While,
less
upstream.
influence
height
was
completely
different.
Most
importantly,
parameters
optimization
should
determined
after
a
comprehensive
evaluation
characteristic
girders.
Physics of Fluids,
Journal Year:
2023,
Volume and Issue:
35(4)
Published: April 1, 2023
This
study
focuses
on
the
aerodynamic
nonlinearity
and
flow
field
phenomenology
of
structure-motion-induced
dynamics
in
fluid–structure
interactions
(FSI),
which
is
essential
for
response
prediction.
Through
dynamic-meshing
large-eddy
simulations
with
near-wall
resolution,
nonlinear
damping
still
wind
has
been
isolated
by
forced
vibration,
its
phenomenological
characteristics
physical
mechanisms
have
analyzed.
The
results
show
that
can
account
up
to
30%
total
damping,
cannot
be
ignored
also
reveals
three-dimensional
vorticity
vary
nonlinearly
structure
motion,
leading
hysteresis
effect
between
forces
displacement.
Furthermore,
in-depth
analysis
discloses
eight
types
coherent
substructures,
including
Stick,
Phone,
Bowknot,
Crutch,
Droplet,
Bat,
Horn,
Flag
are
solely
induced
structural
motion.
Insights
into
these
substructures'
formation,
evolvement,
dissipation,
superposable
magnitude
disclosed.
research
offers
a
new
perspective
understanding
nature
FSI,
serving
as
reference
various
FSI
applications,
bridges,
high-building
design,
other
related
fields.
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(1)
Published: Jan. 1, 2024
This
paper
reports
on
a
numerical
study
of
the
effects
five
spacing
ratios
(L/D
=
3–5)
and
eight
transverse
inclination
angles
(α
0°–30°)
force
coefficients
wake
patterns
two
tandem
circular
cylinders
in
an
X
arrangement,
at
subcritical
Reynolds
number
Re
3900.
It
also
addresses
mutual
interference
between
critical
parameters
determining
flow
transition
(FT)
from
reattachment
to
co-shedding
regime.
The
main
findings
are:
(1)
FT
regimes
was
identified
for
considered
range
L/D
α.
induces
sharp
rise
coefficients,
especially
downstream
cylinder.
can
be
triggered
by
ratio
(L/D)c
different
α,
as
well
excited
angle
αc
L/D.
(2)
When
α
0°
(i.e.,
vertical
cylinders),
occurs
4.5–5.
As
increases
5°,
15°,
25°,
gradually
drops
4–4.5,
3.5–4,
3–3.5,
respectively.
From
another
perspective,
with
fixed
3.5,
4,
4.5,
appears
20°–25°,
12.5°–15°,
0°–5°,
Additionally,
case
3
5,
pattern,
respectively,
remains
regimes.
(3)
formation
regime
requires
sufficient
gap
space
crossing
cylinders.
A
nondimensional
center
top
view
(CS*top
view),
proposed
reflect
variation
space.
value
CS*top
excite
falls
within
3.5–5,
which
is
function
mathematical
expression
view)
points
predominant
role
when
compared
In
addition,
it
accounts
fact
that
has
inverse
effect
vice
versa.
These
provide
new
insight
into
understanding
arrangement.
Physics of Fluids,
Journal Year:
2023,
Volume and Issue:
35(6)
Published: June 1, 2023
Galloping
cross-flow
vibration
responses
of
three
in-line
identical
square
cylinders
are
numerically
studied
for
the
mass
ratio
m*=2,
streamwise
gaps
Lx=3B
and
5B,
reduced
velocity
U*=3−50,
Reynolds
numbers
Re
=
150
in
two
dimensions
(2-D)
2000,
where
flow
is
three-dimensional
(3-D).
Here,
B
side
cylinder.
An
isolated
cylinder
does
not
gallop
since
m*=2
less
than
critical
value
flow,
whereas
bodies,
galloping
instability
triggered
at
upstream
due
to
interference
effect
caused
by
presence
downstream
bodies.
The
interaction
with
wake
promotes
almost
immediately
150.
In
interact
coherent
Karman
vortices
shed
cylinder,
compared
2-D
case.
This
phenomenon
leads
delayed
on-set
response
first
while
second
one
never
gallops.
Physics of Fluids,
Journal Year:
2023,
Volume and Issue:
35(12)
Published: Dec. 1, 2023
This
study
conducts
large
eddy
simulations
(LES)
to
investigate
the
aerodynamic
interference
effects
and
flow
field
characteristics
of
around
square
cylinders,
taking
into
account
inclination
disturbed
structure.
The
configurations
structures
involve
tandem
side-by-side
arrangements
with
angles
structure
including
+15°,
0°,
−15°.
identification
involves
examination
multiple
components,
particularly
time-averaged
velocity
streamlines,
axial
patterns,
instantaneous
spanwise
vortices,
wake
vortex
structures.
results
indicate
that
features
are
significantly
influenced
by
arrangement
type
angle
In
contrast
arrangement,
arranged
in
undergo
a
considerably
reduced
intensity
influence
from
effects.
blocking
effect
channel
undermined
when
is
positive
(α
>
0).
enhances
comprehension
inclined
prisms
simultaneously
establishes
theoretical
foundation
for
wind
resistance
design
building
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(11)
Published: Nov. 1, 2024
Pump
stations
are
critical
for
effective
water
management
in
China,
particularly
sediment-laden
regions
such
as
Ningxia,
where
vortex
flow
patterns
forebays
result
sediment
deposition
and
diminished
operational
efficiency.
Through
this
research
endeavor,
numerical
simulations
engineering
measurements
were
employed
to
systematically
analyze
the
causes
of
adverse
induced
by
water-sediment
two-phase
a
sudden
expansion
pump
station
located
focusing
on
seven
cases
that
examined
behavior
concentration.
Results
indicate
forward
forebay,
inflow
velocity
at
diversion
channel
entrance
is
correlated
with
suspended
Compared
other
cases,
case
5
produces
smaller
has
minimal
impact
pattern
exhibits
lowest
Applying
Q-criterion
reveals
possesses
smallest
structure
volume.
Additionally,
quadratic
polynomial
relationship
between
inlet
efficiency
was
established,
further
confirming
accuracy
5.
At
an
1.065
m/s,
markedly
reduced
strength
decreased,
enabling
particles
escape,
thereby
enhancing
station.
This
study
offers
optimized
conditions
theoretical
guidance
high-sediment
regions.
Frontiers in Physics,
Journal Year:
2023,
Volume and Issue:
11
Published: June 21, 2023
Inclined
prismatic
structures
have
grown
in
popularity
civil
engineering
due
to
increased
architectural
and
aesthetic
demands,
leading
a
surging
need
study
their
aerodynamic
properties.
In
this
study,
an
inclined
square
prism
was
examined
using
wind
tunnel
tests
numerical
simulations
with
aspect
ratio
of
6.25:1.
The
Synchronous
Multi-Pressure
Sensing
System
(SMPSS)
technique
used
evaluate
the
characteristics
structure,
including
surface
pressure
distribution,
local
force
spectra,
coefficient,
coherence,
Strouhal
number.
Moreover,
Large-eddies
simulation
(LES)
were
also
deployed
investigate
flow
field
morphology
around
structure.
Results
show
that
orientation,
direction,
angle
inclination
direction
significantly
affect
prism’s
characteristics.
Several
phenomena
revealed.
Forward
enhances
downwash
flow,
whereas
backward
counterpart
upwash
transverse
produces
noticeable
modification
vortex
near
base.
These
findings
can
inform
structural
design
contaminant
dispersion
efforts.
