Laboratory simulations on the axisymmetrization dynamics and eyewall structure of typhoons
Date Issued
2005-07-31
Date
2005-07-31
Author(s)
DOI
932119M002007AP1
Abstract
The objective of this project is to
investigate the interactions of a pair of
vortices with different strengths in a large
rotating tank whereas the associated flow
behaviors are similar to those of double
eyewall embedded in the super-typhoons.
The generations of vortices with different
structures on relative locations or latitudes
are carefully conducted by combining the
stirring and sinking methods. In particular,
we successfully generate a pair of cyclonic
vortices with six-fold Rossby number ratio
on a parabolic f-plane; the resulting binary
vortex system evolves to a larger cyclonic
vortex with clear double eyewall. On the
other hand, the vortex merger processes on a
sloping bottom, which mimics the planetary
beta-effect, show a series of more
complicated track patterns which are
interwoven by many factors: the cyclonic
orbiting motion, the planetary beta effect,
relative locations and latitudes, as well as the
initial vortex structure. The flow fields are
qualitatively visualized by a dye-injection
method whilst the quantitative information
such as the velocity and the vorticity of the
fluid flow is obtained by a particle tracking
velocimetry method.
Subjects
coriolis force
vortex merger
stirring method
sucking method
particle
tracking velocimetry method (PTV)
tracking velocimetry method (PTV)
Publisher
臺北市：國立臺灣大學應用力學研究所
Type
report
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