Applied Sciences,
Journal Year:
2024,
Volume and Issue:
14(21), P. 9733 - 9733
Published: Oct. 24, 2024
A
new
autonomous
underwater
vehicle
(AUV)
has
high
maneuverability
near
the
bottom
and
a
direction
turnaround
ability,
called
helicopter
(AUH).
This
paper
numerically
investigates
hydrodynamic
performance
of
AUH.
Reynolds-Averaged
Navier–Stokes
(RANS)
equation,
computational
fluid
dynamics
(CFD)
technique,
is
applied
to
analyze
AUH’s
behavior.
Investigations
characteristics
become
more
obvious
with
service
speed
in
range
0.4–1.2
m/s.
For
same
velocity
condition,
resistance
AUH
increases,
irregular
eddy
at
rear
expands
changes
angles
attack
length/height
ratio.
Essential
design
including
pressure,
distribution,
streamlines
are
shown
analyzed.
These
insights
can
be
used
as
guideline
reduce
drag
force
optimize
profile
for
future
designs.
It
great
potential
improving
control
algorithms.
Processes,
Journal Year:
2025,
Volume and Issue:
13(1), P. 281 - 281
Published: Jan. 20, 2025
Microreactors
have
the
advantages
of
high
heat
and
mass
transfer
efficiency,
strict
control
reaction
parameters,
easy
amplification,
good
safety
performance,
been
widely
used
in
various
fields
such
as
chip
manufacturing,
fine
chemicals,
biomanufacturing.
However,
narrow
microchannels
microreactors
often
become
filled
with
catalyst
particles,
leading
to
blockages.
To
address
this
challenge,
study
proposes
a
multiphase
flow
model
based
on
lattice
Boltzmann
method
(LBM)
investigate
dynamic
changes
during
bubble
collapse
process
temperature
distribution
regularities.
Based
developed
three-phase
dynamics
model,
delves
into
shock
evolution
analyzes
Then,
patterns
under
different
particle
density
conditions
are
explored.
The
found
that
action
wave,
stable
structure
liquid
film
is
destroyed,
deforms
collapses.
At
moment
collapse,
energy
rapidly
transferred
from
potential
kinetic
field.
Subsequently,
converted
pressure
waves.
This
results
rapid
generation
extremely
field,
creating
high-velocity
jets
intense
turbulent
vortices,
which
can
enhance
effects
flows.
certain
phenomenon
will
be
formed
at
region
relatively
chaotic
random.
waves
generated
significant
impact
motion
trajectories
while
influence
high-density
particles
small.
offer
theoretical
basis
for
understanding
mechanisms
flow.
Moreover,
these
findings
practical
implications
advancing
technologies
industrial
applications,
including
manufacturing
chemical
transport.
