Drag reduction by the effect of rounded corners for a square cylinder
Physics of Fluids,
Год журнала:
2024,
Номер
36(9)
Опубликована: Сен. 1, 2024
Flow
around
square
cylinders
has
been
studied
via
unsteady
simulations
done
at
a
Reynolds
number
of
Re
=
100.
In
the
present
study,
effects
rounded
corners
on
different
flow
characteristics
have
evaluated.
The
main
influence
considered
for
various
ratios
(r*)
up
to
0.45
in
terms
drag
coefficient
values.
stagnation
points
obtained
front
cylinders.
These
constitute
maximum
pressure.
cluster
sizes
cross-stream
velocity
components
are
nearly
same.
Viscous
generates
vortices
top
and
bottom
edges
cylinder.
produced
affected
by
wake
region.
When
moving
away
from
bodies,
streamwise
profiles
influenced
variation
corner
ratios.
region
shrunk
owing
corners,
reduction
provided.
(CD)
as
1.418
r*
0.
As
result
increasing
ratio
coefficients
decreased
percentage
values
4.6%,
7.2%,
8.4%,
9.6%,
11.1%,
11.9%,
12.5%,
13.3%,
14.3%
decrement
0.05
when
compared
reference
value.
most
effective
value
attained
4.6%
row.
Even
though
tends
increase
enhancing
increment
rate
indicates
decreasing
trend.
Язык: Английский
Numerical Investigation of Flow Field Characteristics around Two Ship Hull Sections with Different Reynolds Numbers
Journal of Marine Science and Engineering,
Год журнала:
2024,
Номер
12(9), С. 1547 - 1547
Опубликована: Сен. 4, 2024
In
the
field
of
ocean
engineering,
variation
flow
during
ship-to-ship
(STS)
interaction
has
been
a
hot
topic.
Noteworthy,
effect
vortex
distribution
on
characteristic
variations
STS
remains
insufficiently
researched.
This
study
modifies
RNG
k-ε
model
using
OpenFOAM
platform
and
verifies
its
reliability
by
comparing
it
with
literature
data.
Subsequently,
extended
research
is
conducted
to
investigate
characteristics
two
different
ship
hull
sections
under
Reynolds
numbers
(Re=68,000
Re=6800),
analyzing
velocity
components,
distribution,
trends
in
pressure
turbulent
kinetic
energy
fields
relative
field.
The
reveals
that
Re
primarily
governs
changes
upstream
downstream
fields,
while
gap
field,
more
constrained
geometry
boundary
conditions.
provides
valuable
reference
for
assessing
interactions.
Язык: Английский