IOP Conference Series Materials Science and Engineering,
Journal Year:
2023,
Volume and Issue:
1288(1), P. 012035 - 012035
Published: Aug. 1, 2023
Abstract
This
paper
presents
a
numerical
simulation
of
the
steady
propulsion
state
manta
rays
and
investigates
influence
single
motion
parameters
addition
perturbation
signals
on
hydrodynamic
characteristics
vortex
evolution
rays.
A
model
equations
ray
were
established
by
observing
living
organisms,
then
computational
method
combining
immersed
boundary
(IBM)
Sphere
function-based
Gas
Kinetic
Scheme
(SGKS)
was
used
to
simulate
active
ray.
The
results
show
that
in
parameter,
as
frequency
increases,
thrust
force
increases
subsequently,
but
efficiency
decreases;
with
increase
amplitude,
also
reaches
maximum
at
dimensionless
amplitude
0.35;
wavenumber
its
0.4,
subsequently.
When
same
low-frequency
sinusoidal
is
added,
both
decrease
when
less
than
or
equal
greater
0.6.
work
provides
new
perspective
study
characteristics.
Physics of Fluids,
Journal Year:
2023,
Volume and Issue:
35(6)
Published: June 1, 2023
Manta
rays
and
tunas
are
outstanding
representatives
of
propulsion
by
MPF
(median
and/or
paired
fin)
BCF
(body
caudal
fin),
respectively,
it
is
an
interesting
topic
to
see
what
kind
fluid
effects
will
be
generated
when
they
meet
during
the
swimming
process.
In
present
study,
numerical
simulations
were
performed
for
individual
state
manta
ray/tuna
group
ray
tuna
in
a
tandem
arrangement.
conditions,
increasing
amplitude
helps
improve
thrust
wave
number
efficiency;
frequency,
increases
monotonically
efficiency
first
then
decreases.
state,
enhanced
at
most
spacings,
smaller
spacing,
greater
enhancement,
as
seen
vortex
structure,
which
benefits
from
merging
rear
wake.
The
curves
fluctuate
greatly
with
related
position
wake
field
where
located.
Renewable and Sustainable Energy Reviews,
Journal Year:
2023,
Volume and Issue:
184, P. 113589 - 113589
Published: July 29, 2023
A
comprehensive
review
of
flapping
foils
for
Wave
Devouring
Propulsion
(WDP)
is
presented.
The
foil
can
effectively
utilize
wave
energy
and
generate
thrust.
development
WDP
discussed,
followed
by
an
introduction
to
the
geometry,
modes
motion,
operating
principles.
These
research
studies
are
classified
as
theoretical,
experimental,
numerical
provided
in
detail.
They
demonstrate
that
marine
equipment
with
a
system
achieve
high
conversion
efficiency
low
resistance.
Several
prototypes
combination
human-crewed
uncrewed
vessels
have
been
shown,
including
latest
initial
concept
models
company
products.
There
huge
prospect
self-driven,
pollution-free
propulsion
devices,
this
paper
suggests
several
future
studies.
Journal of Fluid Mechanics,
Journal Year:
2024,
Volume and Issue:
984
Published: April 4, 2024
Recent
studies
have
shown
that
superimposing
rhythmic
perturbations
to
oscillating
tailbeats
could
simultaneously
enhance
both
the
thrust
and
efficiency
(Lehn
et
al.
,
Phys.
Rev.
Fluids
vol.
2,
2017,
p.
023101;
Chao
PNAS
Nexus
3,
2024,
073).
However,
these
investigations
were
conducted
with
a
tethered
flapping
foil,
overlooking
self-propulsion
intrinsic
real
swimming
fish.
Here,
we
investigate
how
high-frequency,
low-amplitude
superimposed
impact
self-propelled
pitching
heaving
of
rigid
foil.
The
swimming-speed-based
Reynolds
number
ranges
from
1400
2700
in
our
study,
depending
on
modes.
Numerical
results
reveal
significantly
increase
speeds
motions,
while
enhancing
exclusively
motion.
Further
derived
scaling
laws
elucidate
relationships
speeds,
power
costs
efficiency,
respectively.
These
findings
not
only
hypothesise
potential
advantages
biological
systems,
but
also
inspire
designs
controls
biomimetic
propulsion
manoeuvring
within
aquatic
environments.
Journal of Renewable and Sustainable Energy,
Journal Year:
2024,
Volume and Issue:
16(5)
Published: Sept. 1, 2024
Submerged
flapping
hydrofoils
have
the
capability
to
directly
convert
wave
energy
into
thrust,
offering
a
sustainable
approach
marine
propulsion.
This
research
employs
computational
fluid
dynamics
(CFD)
analyze
propulsion
mechanism
of
wave-induced
hydrofoils.
Initially
validated
through
established
benchmarks
and
experimental
results
with
foil
in
uniform
flow,
CFD
model
was
then
applied
examine
generation
thrust
by
heading
regular
wave.
The
study
reveals
distinct
transition
from
drag
characterized
patterns
vortex
flow.
For
first
time,
influence
pitch
stiffness
on
this
process
is
extensively
explored,
identifying
optimal
conditions
for
application
future
eco-friendly
systems.
PNAS Nexus,
Journal Year:
2024,
Volume and Issue:
3(3)
Published: Feb. 17, 2024
Understanding
how
animals
swim
efficiently
and
generate
high
thrust
in
complex
fluid
environments
is
of
considerable
interest
to
researchers
various
fields,
including
biology,
physics,
engineering.
However,
the
influence
often-overlooked
perturbations
on
swimming
fish
remains
largely
unexplored.
Here,
we
investigate
propulsion
generated
by
oscillating
tailbeats
with
superimposed
rhythmic
frequency
low
amplitude.
We
reveal,
using
a
combination
experiments
biomimetic
fish-like
robotic
platform,
computational
dynamics
simulations,
theoretical
analysis,
that
can
significantly
increase
both
efficiency
production.
The
introduction
increases
pressure-induced
thrust,
while
reduced
phase
lag
between
body
motion
subsequent
response
improves
efficiency.
Moreover,
our
findings
suggest
beneficial
are
sensitive
kinematic
parameters,
resolving
previous
conflicts
regarding
effects
such
perturbations.
Our
results
highlight
potential
benefits
introducing
generators,
providing
hypotheses
for
living
systems
inspiring
design
artificial
flapping-based
systems.
