Laboratory simulations on the axisymmetrization dynamics and eyewall structure of typhoons
Date Issued
2004-07-31
Date
2004-07-31
Author(s)
DOI
922119M002010AP1
Abstract
In the present study, we experimentally
investigate related flow physics of the
interaction between two co-rotating columnar
vortices in a rectangular water tank without
background rotation. Using a 2-D PIV
technique, we can quantitatively obtain the
time evolutions of the velocity and the
vorticity distributions as well as the
circulation and the total enstrophy of the
co-rotating vortices system. The results show
a slowly decaying tendency of the total
circulation of the vortices system both in the
cases of the equal-strength vortices and the
unequal-strength vortices interactions. We
conclude three stages of the interacting
process of these cases. They are (1) the
orbiting process which has a rapid decrease
of their total enstrophy, (2) the
during-merging process which has a gentle
decreasing rate of the total enstrophy and
finally (3) the after-merging process which
the decreasing rate of total enstrophy
becomes strong again. Such flow analysis can
be used as an indicator of the vortex
dynamics of the co-rotating vortices system,
such as the process of the axisymmetrization
of typhoons and the mechanism of eyewall
dynamics.
Subjects
vortex merger
total enstrophy
particle image velocimetry (PIV)
Publisher
臺北市：國立臺灣大學應用力學研究所
Type
report
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