Mixed heat transfer from a square cylinder near the wall
Physics of Fluids,
Journal Year:
2025,
Volume and Issue:
37(3)
Published: March 1, 2025
This
study
investigates
the
effect
of
flow
and
heat
transfer
on
a
square
cylinder
placed
near
planar
wall.
The
is
assumed
to
be
within
boundary
layer
Five
different
wall-to-cylinder
gap
ratios
are
considered,
i.e.,
G/D
=
0.2,
0.6,
1.2,
2,
3.
Reynolds
number
based
width
fixed
at
Re
150.
In
this
study,
two-dimensional
analysis
performed
for
mixed
convection
under
influence
aiding
opposing
buoyancy
(−1≤Ri
≤
1).
unsteady
governing
continuity,
momentum,
energy
equations
solved
with
fully
implicit
fractional-step
method
using
computer
code
written
in
FORTRAN.
numerical
results
have
been
presented
terms
characteristics,
such
as
mean
drag
rms
lift
coefficients,
local
Nusselt
variations.
For
qualitative
assessment,
field
temperature
distributions
also
acquired
interpret
understand
underlying
physical
mechanism
because
patterns
change
simultaneously.
case
pure
forced
convection,
rate
0.2
was
about
half
that
3
case.
significant
caused
by
large
velocity
difference
between
top
front
surfaces
when
plane
Additionally,
Ri
>
0,
ratio
coefficient
Nu
decreased.
Language: Английский
Consideration of Aspect Ratios on Flow Around Wall-mounted Square Cylinders
Journal of Marine Science and Application,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 2, 2025
Language: Английский
The groove effect on wake characteristics of rotating cylinders
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(7)
Published: July 1, 2024
In
the
present
study,
active
and
passive
flow
control
methods
have
been
implemented
to
investigate
their
effects
on
wake
structures
of
a
circular
cylinder.
Grooves
having
circular,
rectangular,
triangular
cross
sections
applied
cylinders
exposed
rotation
rates,
α,
from
0
0.79.
The
experiments
conducted
by
particle
image
velocimetry
at
Reynolds
number
Re
=
5
×
103.
contour
graphics
time-averaged
results
presented.
Moreover,
variations
in
velocity
profiles
also
depicted.
experimental
revealed
significant
for
patterns,
structures,
turbulence
parameters
due
both
groove
geometries
rotational
motion.
stationary
cases,
intensity,
grooved
cylinder
exhibited
15%
increase,
while
showed
slightly
higher
increase
around
20%
compared
that
bare
(BC).
Conversely,
non-stationary
rectangular
displayed
most
prominent
reduction
decreasing
approximately
10%
BC.
type
has
considerably
affected
regions,
especially
lower
rates.
Language: Английский
Drag reduction by the effect of rounded corners for a square cylinder
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(9)
Published: Sept. 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.
Language: Английский