Applied Sciences,
Год журнала:
2024,
Номер
14(24), С. 11938 - 11938
Опубликована: Дек. 20, 2024
Deep-sea
mining
pipes
are
different
from
traditional
ocean
risers
articulated
at
both
ends:
they
free-suspended,
weakly
constrained
the
bottom,
and
have
an
intermediate
silo
end,
compared
to
which
relatively
little
research
has
been
carried
out
on
vortex-induced
vibration
in
pipes.
In
this
study,
a
sophisticated
quasi-3D
numerical
model
with
two
degrees
of
freedom
for
flow
field
domain
structural
dynamics
deep-sea
pipe
is
developed
through
novel
slicing
method.
The
investigation
explores
how
vibrations
behave
various
scenarios,
including
uniform
oscillating
flows,
as
well
changes
mass
relay
bin.
findings
indicate
that
displacement
increases
continuously
it
moves
top
bottom
along
its
axial
direction.
upper
motion
track
appears
chaotic,
while
middle
lower
tracks
exhibit
stable
“8”
shape
capture,
tail
capturing
“C”
track.
Furthermore,
increase
velocity,
transverse
frequency
modes
progressively
rise.
Under
conditions,
there
exists
“delay
effect”
between
amplitude
velocity.
Additionally,
oscillation
leads
gradual
sparsity
envelope
direction
without
affecting
overall
frequency.
same
velocity
effects,
main
control
basically
unchanged,
but
mode
changed.
Marine Structures,
Год журнала:
2024,
Номер
95, С. 103578 - 103578
Опубликована: Янв. 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,
Год журнала:
2024,
Номер
36(10)
Опубликована: Окт. 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.
