Coherent structures in the flow around a pier group with scour hole
Murali Krishnamraju Kalidindi,
Rakesh Khosa
Physics of Fluids,
Год журнала:
2025,
Номер
37(1)
Опубликована: Янв. 1, 2025
Local
scouring
around
a
pier
group
is
more
complex
than
the
one
single
pier.
This
study
used
numerical
simulations
to
investigate
influence
of
coherent
structures
and
their
interactions
on
development
scour
hole
group.
The
obtained
results
are
validated
with
previous
experimental
findings.
revealed
that,
in
addition
horseshoe
vortex
(HSV),
other
secondary
vortices
present
inside
hole.
between
them
significantly
changed
size
coherence
HSV.
independent
at
left
right
piers
led
differences
depth
those
piers.
instantaneous
velocity
histograms
bimodal
aperiodic
oscillations
lateral
movement
detached
legs
HSV
was
found
be
reasons
for
expansion
also
extracted
using
Lagrangian
method
called
(LCSs).
LCSs
shear
layers
formed
upstream
They
presence
anchor-like
within
identified
new
mechanisms
contributing
formation
holes
groups.
Язык: Английский
Coherent Structure Variations in the Flow around a Square Pier with an Evolving Scour Hole
Murali Krishnamraju Kalidindi,
Rakesh Khosa
Journal of Hydraulic Engineering,
Год журнала:
2025,
Номер
151(4)
Опубликована: Март 17, 2025
Язык: Английский
Lagrangian coherent structures around a bridge pier with scour hole
Murali Krishnamraju Kalidindi,
Rakesh Khosa
Physics of Fluids,
Год журнала:
2024,
Номер
36(9)
Опубликована: Сен. 1, 2024
Accurate
prediction
of
scour
depth
is
essential
for
the
safety
bridge.
The
downflow
upstream
pier
plays
a
significant
role
in
hole
formation.
present
study
used
Lagrangian
coherent
structures
(LCSs)
to
derive
an
expression
estimate
force
exerted
by
on
sediment
bed.
LCSs
extracted
trapping
region
pier,
which
trapped
fluid,
was
then
converted
into
downflow.
expressions
derived
this
Letter
can
be
improve
efficiency
equations.
Язык: Английский
Ship Lock Extraction from High-Resolution Remote Sensing Images Based on Fuzzy Theory and Prior Knowledge
Remote Sensing,
Год журнала:
2024,
Номер
16(17), С. 3181 - 3181
Опубликована: Авг. 28, 2024
As
crucial
water
conservancy
projects,
ship
locks
play
a
key
role
in
flood
control,
shipping,
resource
allocation,
and
promoting
regional
economic
development,
making
them
an
indispensable
part
of
the
modern
transportation
system.
Utilizing
satellite
remote
sensing
for
lock
extraction
can
significantly
reduce
manual
workload
costs,
assist
daily
dynamic
maintenance
hubs,
provide
more
comprehensive
data
support
construction
management
transport
infrastructure.
In
this
context,
paper
proposes
new
method
object
extraction.
Leveraging
fuzzy
theory
prior
knowledge
locks,
objects
is
achieved
from
Gaofen-1
(GF-1)
high-resolution
images.
The
experimental
results
demonstrate
that
proposed
algorithm
effectively
extract
small
images,
achieving
average
accuracy
80.9%
study
area.
Язык: Английский
On increasing the scour funnel size upstream of a bottom orifice by using a cuboid pile
Physics of Fluids,
Год журнала:
2024,
Номер
36(12)
Опубликована: Дек. 1, 2024
Scour
funnels
formed
before
bottom
orifices
are
of
vital
importance
regarding
intaking
water
with
low-concentration
and
small-sized
sediment
to
protect
the
turbine.
Via
flume
experiments,
this
work
investigates
effect
a
bottom-mounted
cuboid
pile
on
formation
scour
funnel
upstream
orifice.
A
phenomenon
we
call
as
“reverse
collapse”
is
observed
for
first
time,
which
causes
rapid
increase
in
depth
Instantaneous
velocity
measurements
show
that
turbulence
kinetic
energy
near
significantly
higher
compared
case
without
or
cylinder
under
same
waterhead
condition,
indicating
large-scale
vortex
motions
enhanced
due
use
pile.
The
equilibrium
orifice
found
be
increased
by
much
124.6%
when
exists
condition.
process
highly
accelerated
exists,
it
time
required
reach
dramatically
reduced
97.2%–99.7%.
formula
was
established
calculate
depth.
findings
provide
guidance
future
optimization
form
placement
structures
an
efficiently
achieve
larger-sized
funnel.
Язык: Английский