Physics of Fluids,
Journal Year:
2019,
Volume and Issue:
31(9)
Published: Sept. 1, 2019
Recently,
a
vector
called
Rortex
was
proposed
and
successfully
applied
to
identify
the
local
fluid
rotation
with
both
axis
strength.
The
first
implementation
relies
on
real
Schur
decomposition
of
velocity
gradient
tensor,
resulting
in
relatively
long
computational
time.
Subsequently,
mathematically
equivalent
eigenvector-based
definition
introduced
an
improved
implementation.
Unfortunately,
this
still
tends
be
algorithmic
description
rather
than
explicit
one
involves
two
successive
cumbersome
coordinate
rotations.
In
paper,
simple
expression
for
calculation
vector,
which
is
based
special
(transposed)
form
presented.
consistent
previous
but
avoids
rotation,
thus
can
significantly
simplify
According
expression,
new
validated
by
large
eddy
simulation
flow
transition
around
NACA0012
airfoil
direct
numerical
boundary
layer
flat
plate.
Space Science Reviews,
Journal Year:
2023,
Volume and Issue:
219(1)
Published: Jan. 6, 2023
Vortex
flows,
related
to
solar
convective
turbulent
dynamics
at
granular
scales
and
their
interplay
with
magnetic
fields
within
intergranular
lanes,
occur
abundantly
on
the
surface
in
atmosphere
above.
Their
presence
is
revealed
high-resolution
high-cadence
observations
from
ground
space
state-of-the-art
magnetoconvection
simulations.
Vortical
flows
exhibit
complex
characteristics
dynamics,
excite
a
wide
range
of
different
waves,
couple
layers
atmosphere,
which
facilitates
channeling
transfer
mass,
momentum
energy
up
low
corona.
Here
we
provide
comprehensive
review
documented
research
new
developments
theory,
observations,
modelling
vortices
over
past
decades
after
observational
discovery,
including
recent
Hα
,
innovative
detection
techniques,
diverse
hydrostatic
waves
forefront
magnetohydrodynamic
simulations
incorporating
effects
non-ideal
plasma.
It
first
systematic
overview
vortex
scales,
field
plethora
names
for
phenomena
that
similarities
differences
often
interconnect
rely
same
physics.
With
advent
4-m
Daniel
K.
Inouye
Solar
Telescope
forthcoming
European
Telescope,
ongoing
Orbiter
mission,
development
cutting-edge
simulations,
this
timely
addresses
outlines
both
theoretical
future
directions.
Engineering Applications of Computational Fluid Mechanics,
Journal Year:
2021,
Volume and Issue:
15(1), P. 1613 - 1628
Published: Jan. 1, 2021
The
dominant
vortex
structure
near
the
hub
in
rotor
corner
separation
flow
has
an
important
influence
on
internal
of
axial
rotating
machinery.
However,
current
quantitative
research
key
vortical
characteristics
is
still
insufficient.
analysis
(horn-like
vortex)
pump
was
conducted
and
found
that
average
intensity
turbulence
eddy
dissipation
show
a
gradual
weakening
trend
along
core
line
from
region
to
tail
under
various
working
conditions.
evolution
horn-like
life
cycle
includes
five
stages,
inception-growth-development-attachment-decay
typical
condition
0.62Q0.
statistical
frequency
periodic
about
2.76
times
shaft
rotation
frequency.
pressure
fluctuation
induced
by
increases
rapidly
dominates
channel.
peak-peak
value
impeller
outlet
section
close
2.79
inlet
should
be
paid
enough
attention
to.
