Research Square (Research Square),
Journal Year:
2023,
Volume and Issue:
unknown
Published: July 24, 2023
Abstract
Marine
transportation
is
still
the
primary
source
of
global
transportation.
The
propeller,
which
a
critical
componentof
propulsion
system,
must
be
designed
with
multiple
constraints
and
objectives
to
satisfy
need.
Recent
studies
propose
that
utilizing
an
improved
optimization
algorithm
computational
analysis
would
explore
better
designs
than
conventionalmethods.
In
present
study,
Elitist
Particle
Swarm
Optimization
(EPSO)
technique
implemented
optimize
design
ofa
marine
propeller.
Potsdam’s
Conventional
Propeller
VP
1304
used
as
benchmark
case.
Reynold’s
Averaged
NavierStokes
equation
based
Computational
Fluid
Dynamics
(CFD)
along
Vortex
Lattice
Method
(VLM)
StructureInteraction
(FSI)
model
for
analysis.
results
obtained
in
this
study
are
validated
against
previously
published
experimental
data.
An
optimized
propeller
proposed
on
technique.It
observed
shows
open
water
performance
lower
advance
coefficient
(J)
valuesbased
given
constraints.
It’s
also
efficiency
by
7
percent
J=0.6
compared
tothe
original
design.
one-way
Structure
Interaction
structurally
stable
underopen
test
conditions
Sustainability,
Journal Year:
2024,
Volume and Issue:
16(11), P. 4601 - 4601
Published: May 29, 2024
Water
pollution
has
become
a
major
environmental
menace
due
to
municipal
and
industrial
effluents
discharged
into
water
bodies.
Several
processes
have
been
devised
for
the
treatment
disposal
of
wastewater
sludge.
Yet,
most
conventional
technologies
do
not
meet
requirements
sustainability
as
they
impose
higher
load
on
environment
in
terms
resource
depletion
toxic
waste
generation.
Recently,
sustainable
innovative
technologies,
like
hydrodynamic
cavitation
(HC),
emerged
energy-efficient
methods,
which
can
enhance
processes.
HC
is
very
effective
technique
intensification
processes,
aeration,
activated
sludge
treatment,
anaerobic
digestion
plants,
particularly
enhanced
degradation
persistent
pollutants.
On
other
hand,
advanced
oxidation
proven
enhancement
method
treatment.
This
review
provides
comprehensive
overview
recently
published
literature
application
organic
The
potential
synergistic
impact
coupled
with
alternative
pre-treatment
methods
was
also
reviewed
this
study.
Moreover,
an
present
state
model-based
research
work
reactors
feasibility
analysis
various
process
covered.
Options
pilot-to-large
scale
implementation
ensure
better
plants
are
recommended.
Journal of Physics Conference Series,
Journal Year:
2024,
Volume and Issue:
2716(1), P. 012053 - 012053
Published: March 1, 2024
Abstract
Due
to
their
high
reliability
and
precision,
piston
valves
are
frequently
used
for
pressure
regulating
applications.
Particularly
in
the
aerospace
industry,
where
cryogenic
fluids
such
as
liquid
hydrogen
used,
design
operation
of
become
crucial.
The
current
state
advancement
this
technology
field
is
still
its
early
stages,
owing
difficulties
designing
complex
systems
harsh
environments.
This
justifies
need
further
in-depth
studies
analysis
using
CFDs
tools
predictive
models.
In
order
ensure
an
optimal
efficient
use
a
valve
environment,
it
necessary
understand
strengths
limitations
extreme
thermal
mechanical
condition.
presented
work
concentrates
therefore
on
preliminary
optimization
operating
flow
field,
Particular
focus
will
be
dedicated
overall
dynamics
main
body
piston,
terms
robustness
controllability
desired
response
system.
within
extremely
low-viscous
flow,
well
thermodynamic
fluid
dynamic
aspects
system,
discussed.
Simulations
performed
through
CFD
tool,
crossing
results
with
simulated
system
implemented
Simulink
model.
obtained
then
critically
analysed
suggest
possible
locations
most
affected
from
standpoint.
Energies,
Journal Year:
2024,
Volume and Issue:
17(14), P. 3602 - 3602
Published: July 22, 2024
Wave
energy
converters
(WECs)
utilizing
the
Oscillating
Water
Column
(OWC)
principle
have
gained
prominence
for
harnessing
kinetic
from
ocean
waves.
This
study
explores
an
innovative
approach
by
transforming
pivoting
Denniss–Auld
turbine
blades
into
a
fixed
configuration,
offering
simplified
alternative.
The
fixed-blade
design
emulates
maximum
pivot
points
during
OWC’s
exhalation
and
inhalation
phases.
Traditional
turbines
rely
on
complex
hub
systems
to
enable
controllable
blade
rotation
performance
optimization.
research
examines
turbine’s
efficiency
without
mechanical
actuation.
simulations
were
conducted
using
ANSYS™
CFX
2023
R2
solve
three-dimensional,
incompressible,
steady-state
Reynolds-Averaged
Navier–Stokes
(RANS)
equations,
employing
k-ω
SST
turbulence
model
close
system
of
equations.
A
grid
convergence
was
performed,
numerical
results
validated
against
available
experimental
data.
An
in-depth
analysis
intricate
flow
field
around
also
conducted.
modified
demonstrated
broad
operating
range,
avoiding
stalling
at
high
coefficients
exhibiting
characteristics
like
impulse
turbine.
However,
peak
12%,
significantly
lower
than
that
conventional
turbines.
Future
should
focus
expanding
space
through
parametric
studies
enhance
power
output.
Journal of Marine Science and Engineering,
Journal Year:
2024,
Volume and Issue:
12(9), P. 1681 - 1681
Published: Sept. 20, 2024
The
occurrence
of
cavitation
in
marine
propellers
is
a
major
source
noise
ships.
Consequently,
the
and
characteristics
must
be
better
understood
to
control
this
issue.
This
study
focuses
on
identifying
cavitating
flow
around
two-dimensional
(2D)
hydrofoils.
Using
commercial
computational
fluid
dynamics
software
STAR-CCM+,
numerical
analysis
was
conducted
partial
cavity
occurring
2D
hydrofoils
at
specific
angles
attack.
In
addition,
were
analyzed
by
conducting
frequency
using
predicted
pressure
data
obtained
via
fluctuating
sensor
positioned
vertically
above
hydrofoil.
results
compared
with
existing
experimental
validate
accuracy
simulation.
identifies
limitations
Reynolds-averaged
Navier–Stokes
(RANS)
method
closely
comparing
it
large
eddy
simulation
(LES)
for
assessing
unsteady
flow.
Although
RANS
has
qualitatively
periodic
behavior
LES,
effectively
predicts
extent
valuable
relative
assessments
practical
applications.
