Suppression of wake-induced galloping of tandem cylinders by helical strakes
International Journal of Mechanical Sciences,
Год журнала:
2024,
Номер
273, С. 109301 - 109301
Опубликована: Апрель 16, 2024
Язык: Английский
Novel Petal-based Configurations to Enhance Flow-Induced Vibration Energy Harvesting: Numerical and Experimental Analysis
Renewable Energy,
Год журнала:
2025,
Номер
250, С. 123326 - 123326
Опубликована: Май 6, 2025
Язык: Английский
Passive flow control in the wake of bed-mounted cylinders: a review and new experimental insights
Frontiers in Mechanical Engineering,
Год журнала:
2025,
Номер
11
Опубликована: Май 21, 2025
Controlling
wake
flow
behind
bed-mounted
circular
cylinders
is
required
in
many
engineering
applications.
This
study
investigates
several
passive
control
mechanisms,
including
the
use
of
helical
strakes,
meshes,
foam
coverings,
slots,
and
holes.
A
detailed
review
existing
experimental
numerical
studies
conducted
to
examine
principles,
applications,
effects
each
method.
While
extensive
research
exists
on
individual
techniques,
comparative
between
different
methods
are
notably
lacking.
Additionally,
variations
approach
conditions
across
highlight
need
for
a
systematic
evaluation
under
identical
or
near-identical
inflow
conditions.
To
address
these
gaps,
particle
image
velocimetry
measurements
were
employed
capture
compare
unsteady
dynamics
various
types
cylinders.
Experiments
at
Reynolds
number
1.45×104
,
based
cylinder
diameter.
The
results
show
that
plain
cylinder’s
dominated
by
large
recirculation
region
downstream
bifurcation,
while
meshed
shows
minimal
deviation
from
characteristics.
with
holes
generate
localized
turbulence
spiraling
patterns,
diminishing
downstream.
strakes
induce
unique
channelized
sustained
downstream,
whereas
single
cross-slotted
enhance
near-wake
velocity
via
high-velocity
jets,
particularly
configuration,
making
it
ideal
heat
transfer
In
contrast,
foam-covered
effectively
reduce
fluctuations,
offering
potential
applications
requiring
stability
drag
reduction.
Язык: Английский
Vortex-induced vibration of a sinusoidal wavy cylinder: The effect of wavelength
Physics of Fluids,
Год журнала:
2024,
Номер
36(8)
Опубликована: Авг. 1, 2024
While
considerable
research
has
addressed
flow
around
stationary
sinusoidal
wavy
cylinders,
studies
on
vortex-induced
vibration
(VIV)
of
elastic-supported
cylinders
still
remain
limited.
This
study
aims
to
address
this
gap
through
a
series
water
tunnel
experiments,
focusing
the
effects
cylinder's
spanwise
wavelength.
Three
typical
wavelengths
(λ*
=
1.8,
3.6,
and
6.0)
are
considered,
with
first
third
identified
as
optimal
for
reducing
fluid
forces
(lift
by
over
90%)
in
previous
cylinder
studies.
The
oscillates
transversally
at
range
reduced
velocities
Ur
3.0–12.0,
corresponding
Reynolds
numbers
(1.5–7.0)
×
103.
Results
indicate
that,
compared
smooth
cylinder,
λ*
1.8
experiences
oscillation
throughout
VIV
regime,
while
3.6
or
6.0
undergo
enhanced
broader
lock-in
range.
tend
occur
higher
Ur,
leading
an
extension
lower
branch.
Frequency
analysis
shows
despite
affecting
amplitude,
surface
retains
features.
These
results
reveal
notable
dependence
force-displacement
phase
lag
Finally,
we
provide
detailed
discussion
phase-averaged
time-averaged
structures
from
time-resolved
particle
image
velocimetry
measurement.
Overall,
addresses
concerning
impact
wavelength
behavior
elastically
supported
providing
significant
insights
development
practical
strategies
suppression
enhancement.
Язык: Английский