Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(10)
Published: Oct. 1, 2024
Micro
vortex
generators
(mVGs)
control
cavitation
by
altering
the
boundary
layer
flow
structure.
This
study
employs
wall-adapting
local
eddy-viscosity
large
eddy
simulation
(WALE-LES)
turbulence
model
combined
with
Zwart–Gerber–Belamri
to
conduct
transient
numerical
simulations
on
National
Advisory
Committee
for
Aeronautics
0015
baseline
hydrofoil
and
equipped
mVGs
under
various
numbers.
The
proper
orthogonal
decomposition
method
experiments
verify
accuracy
consistency
of
these
regarding
cavity
scale.
elucidates
mechanisms
which
suppress
cloud
at
low
numbers
induce
high
Results
indicate
that
maintain
sheet
characteristics
numbers,
reducing
wall
pressure
fluctuations
enhancing
stability.
During
inception,
mVG-induced
leads
early
formation.
In
phase,
modal
energy
distribution
is
more
dispersed,
while
in
inception
concentrated
significant
dominant
modes.
Moreover,
counter-rotating
vortices
generated
mitigate
separation,
enhance
leading-edge
attachment
stability,
reduce
high-frequency
vibrations
caused
bubble
shedding.
significantly
advances
understanding
accurately
simulating
revealing
across
different
stages
using
WALE-LES
model.
findings
demonstrate
can
effectively
stabilize
structures
instabilities
overall
performance.
These
insights
will
have
a
impact
design
hydrofoils
development
strategies.
Ultrasonics Sonochemistry,
Journal Year:
2024,
Volume and Issue:
103, P. 106790 - 106790
Published: Feb. 1, 2024
The
objective
of
this
paper
is
to
discuss
the
influence
geometric
parameters
on
performance
rotational
hydrodynamic
cavitation
reactor
(RHCR)
using
numerical
method.
novel
RHCR
implemented
by
modifying
a
centrifugal
impeller
into
new
one
annular
slit
constriction
(ASC)
with
circumferentially
distributed
blind
holes.
intensity
and
generation
rate
are
selected
evaluate
performance,
head
used
assess
conveying
entropy
theory
energy
loss
in
impeller.
effect
axial
width,
radial
length
position
ASC
cavitating
flow
investigated
CFD
results
indicate
that
three
patterns
induced
RHCR,
including
separation
cavitation,
vortex
shear
cavitation.
important
parameter
affect
RHCR.
A
small
width
superior
large
terms
although
suffers
as
result.
initially
increases
then
decreases
decreases.
Both
reduction
leads
higher
capacity,
accompanying
slight
increase
loss.
Compared
original
model,
an
3
mm,
17
0.541
achieves
highest
performance.
Journal of Fluids Engineering,
Journal Year:
2024,
Volume and Issue:
146(6)
Published: Feb. 22, 2024
Abstract
To
simulate
the
microscale
bubble
distribution
and
its
effect
on
high-frequency
cavitation
noise,
we
present
a
two-way
transition
coupling
Euler–Lagrange
model.
The
model
accounts
for
both
cavity
fission
environmental
nucleation
as
sources
of
bubbles,
which
are
limited
in
traditional
mesh-based
Euler
models.
We
evaluate
with
experimental
data
truncated
NACA0009
hydrofoil
well
measured
size
distributions,
showing
satisfactory
results
velocity
distribution,
patterns,
power
law
scalings
size.
Based
an
acoustic
analogy,
find
that
produces
sound
waves
smaller
wavelengths
higher
frequencies
than
model,
mainly
attributed
to
two
factors:
(1)
bubbles
high
natural
frequency
(2)
intense
multiple
collapse/rebound
behavior.
This
is
promising
predicting
full-spectrum
noise.
Ultrasonics Sonochemistry,
Journal Year:
2024,
Volume and Issue:
110, P. 107021 - 107021
Published: Aug. 8, 2024
The
challenge
of
cavitation
erosion
(CE)
in
flow-handling
components
marine
engineering
has
promoted
the
development
advanced
materials
due
to
safety
incidents
and
economic
costs.
High
entropy
alloys
(HEAs),
known
for
high
hardness
corrosion
resistance,
emerge
as
promising
candidates.
This
paper
delved
into
CE
characteristics
CoCrFeNiMoCu
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(2)
Published: Feb. 1, 2024
The
unsteady
cavitating
flow
past
a
three-dimensional
twisted
hydrofoil
is
numerically
investigated
by
large
eddy
simulation
to
obtain
in-depth
insight
into
the
bubble
dynamics
near
cavitation
erosion
region.
Macroscopic
cavity
evolution
captured
multiphase
computing
frame,
while
oscillations
in
are
computed
solving
Gilmore
dynamic
model,
which
driving
force
for
movement
exported
through
application
of
discrete
phase
model.
potential
then
robust
indicator
developed
based
on
energy
balance
hypothesis.
relevance
between
and
destructive
essence
intensity
thoroughly
analyzed.
results
show
that
unsteadiness
involved
turbulent
cloud
well
reproduced,
main
risk
middle
region
also
accurately
predicted
comparing
with
painting
test
results.
A
localized
high-pressure
identified
rear
part
attached
where
mainstream
encounters
primary
reentrant
jet
flows.
peak
internal
pressure
can
reach
487
MPa
plane
hydrofoil,
during
stage
when
surrounding
liquid
continuously
increased.
bubbles
smallest
radius,
ranging
from
23.1
26.3
μm
after
compressing
their
initial
sizes
(R0
=
100–700
μm)
wall
region,
associated
extremely
high
pressure,
they
responsible
damage
surface.
