Journal of Marine Science and Engineering,
Journal Year:
2025,
Volume and Issue:
13(2), P. 214 - 214
Published: Jan. 23, 2025
Flow
around
clustered
cylinders
is
widely
encountered
in
engineering
applications
such
as
wind
energy
systems,
pipeline
transport,
and
marine
engineering.
To
investigate
the
hydrodynamic
performance
vortex
dynamics
of
multiple
under
forced
vibration
at
low
Reynolds
numbers,
with
a
focus
on
understanding
interference
characteristics
various
configurations,
this
study
based
self-developed
radial
basis
function
iso-surface
ghost
cell
computing
platform,
which
improves
implicit
interface
representation
method
to
track
moving
boundaries
cylinders,
employs
self-constructed
CPU/GPU
heterogeneous
parallel
acceleration
technique
for
efficient
numerical
simulations.
This
systematically
investigates
cylinder
configurations
across
parameter
domains,
including
spacing
ratios,
geometric
arrangements,
oscillation
modes.
A
quantitative
analysis
key
parameters,
aerodynamic
coefficients,
dimensionless
frequency
characteristics,
vorticity
field
evolution,
performed.
reveals
that,
dual-cylinder
system,
there
exists
critical
gap
ratio
between
X/D
=
2.5
3,
leads
an
increase
lift
drag
coefficients
both
reduction
shedding
periodicity,
disruption
wake
structure.
For
three-cylinder
two
upstream
decrease
increasing
spacing.
On
other
hand,
increased
results
rise
downstream
cylinder.
In
case
four-cylinder
located
either
side
flow
direction
are
relatively
high.
significant
coefficient
occurs
when
less
than
2.0,
while
minimized.
The
findings
establish
comprehensive
theoretical
framework
optimal
configuration
design
structural
optimization
multicylinder
also
providing
practical
guidelines
applications.
Thin-Walled Structures,
Journal Year:
2024,
Volume and Issue:
199, P. 111790 - 111790
Published: March 9, 2024
Understanding
the
interaction
between
fluid
and
structures
under
various
conditions
is
critical
for
engineering
applications,
with
vortex-induced
vibration
(VIV)
being
a
significant
area
of
research.
This
study
presents
comprehensive
numerical
investigation
on
VIV
behaviors
functionally
graded
(FG)
graphene
origami
(GOri)-enabled
auxetic
metamaterial
(GOEAM)
splitter
plates
attached
to
circular
cylinder
by
employing
finite
element
analysis.
The
plate
composed
multiple
GOEAM
layers
material
properties
possessing
gradient
variation
along
thickness
direction.
local
mesh
quality
monitored
improved
Yeoh
smoothing.
present
work
focused
effect
vibrations,
influence
length
wake
patterns,
loads
cylinder–plate
body
vortex
pattern.
reveals
that:
(1)
structure
HGRX-WGRX
distribution
pattern
high
elastic
moduli
in
surface
exhibits
low
deflection
amplitudes,
(2)
shorter
intensify
vortices
while
longer
reduce
prevalence,
(3)
natural
frequencies
both
FG-GOEAM
pure
metallic
are
found
be
well
above
shedding
frequency
as
such,
have
negligible
patterns.
These
insights
offer
an
in-depth
understanding
fluid-structure
interactions
valuable
knowledge
design
optimisation
based
applications.
Ocean Engineering,
Journal Year:
2024,
Volume and Issue:
293, P. 116668 - 116668
Published: Jan. 12, 2024
In
recent
years,
energy
harvesting
systems
driven
by
vortex
induced
vibrations
(VIV)
emerged
as
potential
alternative
to
conventional
rotor-based
installations,
in
particular
for
low
flow
speeds
water.
Best
outputs
are
obtained
when
the
flow-dependent
VIV
frequency
locks
natural
of
structure.
However,
placed
tidal
currents
or
rivers
with
variable
rates,
changes,
leading
mismatch
efficiency
losses.
this
paper,
we
present
a
new
mechatronic
experimental
set-up
study
cylinder
under
various
rates.
particular,
explore
options
improve
adding
computer
controlled
virtual
damping
and
stiffness
mechanical
system.
The
setup
comprises
an
elastically
mounted,
single-degree-of-freedom
within
low-speed
water
tunnel.
Virtual
applied
controlling
force
exerted
through
mechanically
coupled
DC
motor.
experiments
reveal
that
optimal
values
consistent
previous
results
from
literature.
maximum
conversion
around
18%
is
achieved
oscillation
shedding
frequencies
synchronized.
explored
parameter
space
highlights
mismatches
between
strongly
decrease
achievable
efficiency.
By
contrast,
peak
less
sensitive
increase
due
harvesting.
All
these
observations
suggest
need
real-time
structural
control
maintain
economically
acceptable
conditions.
near
future,
plan
automate
rates
testing
Machine
Learning
algorithms
our
set-up.
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(2)
Published: Feb. 1, 2024
This
paper
presents
an
evaluation
of
passive
control
methods
that
employ
surface
protrusions
to
mitigate
the
aerodynamic
sound
generated
from
a
cylinder
wake
flow.
Building
on
previous
designs
optimized
for
low
Reynolds
numbers
(Re
=
150)
through
adjoint-based
aeroacoustic
shape
optimization,
this
study
investigated
performance
under
moderate
number
67
000)
condition
typical
mechanical
engineering
applications
using
simulations
based
lattice
Boltzmann
method.
Three
configurations
were
tested,
all
which
found
significantly
reduce
mean
drag
by
at
least
45%
compared
with
unmodified
circular
cylinder.
Designs
featuring
rear
outperformed
conventional
splitter
plate
in
terms
reduction
performance,
symmetrical
both
front
and
surfaces
achieving
tonal
13
dB.
However,
specific
protrusion
design
increased
low-frequency
owing
intensified
large-scale
flow
separation.
These
findings
highlight
effectiveness
suppressing
oscillations
dipole
generation
subcritical
range.
Moreover,
revealed
need
tailor
optimization.
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.
