Journal of Marine Science and Engineering,
Journal Year:
2024,
Volume and Issue:
12(11), P. 1894 - 1894
Published: Oct. 22, 2024
This
study
conducted
numerical
simulations
of
three-dimensional
vortex-induced
vibrations
(VIV)
on
cylindrical
bodies
with
various
surface
protrusion
coverage
rates,
systematically
investigating
the
impact
and
height
vibrational
response
flexible
cylinders.
The
fluid
forces
riser
were
resolved
using
finite
volume
method,
while
structural
solved
element
method.
A
strongly
coupled
approach
was
employed
for
iterative
updates
between
flow
field
data,
achieving
a
bidirectional
flow–structure
coupling
simulation
VIV
in
marine
environment.
further
explored
performance
protrusions
suppressing
considered
heights
0.1
times
cylinder
diameter
(0.1D)
under
rates
(CR)
0%,
10%,
20%,
30%,
40%,
as
well
seven
different
0.05D,
0.1D,
0.15D
at
20%
rate.
mechanism
suppression
by
identified
altering
separation
point
shear
layer
frequency
vortex
shedding
through
vortices
formed
protrusions.
It
found
that
rate
0.01D
(CR20)
effectively
suppressed
cylinder,
showing
best
suppression,
an
efficiency
30.04%.
These
results
provide
theoretical
basis
designing
more
efficient
devices
contribute
to
enhancing
resistance
structures
against
vibrations.
Marine Structures,
Journal Year:
2024,
Volume and Issue:
95, P. 103578 - 103578
Published: Jan. 25, 2024
The
paper
presents
a
fatigue
assessment
method
for
offshore
steel
catenary
risers
(SCR)
under
vortex-induced
vibrations
(VIV)
with
multi-directional
incoming
flow.
Firstly,
the
structural
responses
are
obtained
using
finite
element
(FEM)
in
conjunction
coupled
cross-flow
(CF)
and
in-line
(IL)
wake
model.
Subsequently,
cyclic
stress
associated
life
is
transformed
into
frequency
domain,
corresponding
Kriging
model
constructed.
Further,
correspondingly
computed
Miner-Palmgren
damage
rule
reliability
established.
To
validate
effectiveness
of
FEM
frequency-domain-based
model,
comparisons
between
experimental
numerical
results
conducted.
Through
analysis
response,
elucidates
mechanism
underlying
impact
incident
angle
on
distribution,
while
emphasizing
contribution
higher
harmonics
to
fatigue.
Moreover,
case
study
demonstrates
superiority
proposed
predicting
probability
failure
factor
safety
compared
models
that
disregard
IL
responses.
Overall,
methodology
contributes
availability
SCRs
during
design
stage,
reduce
potential
fatigue-related
failures.
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(10)
Published: Oct. 1, 2024
The
development
of
marine
resources
is
intrinsically
linked
to
the
utilization
various
equipment.
Among
these,
pipelines
and
cables
are
crucial
for
exploitation
deep-sea
oil
gas
resources.
Mooring
cables,
towed
umbilical
submarine
typical
slender
flexible
components.
These
members
present
dynamic
challenges
during
laying,
installation,
in-position
operation.
Facing
these
challenges,
scholars
from
China
around
globe
have
explored
theoretical,
numerical,
experimental
solutions
challenges.
conclusions
need
be
condensed
improve
their
practical
academic
value
engineering
applications.
This
paper
summarizes
explorations
provides
general
design
methods
concepts
pipelines.
Additionally,
this
looks
forward
future
trend
in
applications
as
well
theoretical
research.
aim
provide
a
reference
research
underwater
cables.
