Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Impact of a Deep-Water Plunging Breaker on a Partially Submerged
  Cube   The impact of a plunging breaker on a partially submerged cube is explored
experimentally in a wave tank equipped with a programable wave maker. The
experiments are conducted with the cube (dimension $L=30.48$ cm) positioned at
one streamwise location relative to the wave maker and at three heights
relative to the undisturbed water level. A single, repeatable wave maker motion
producing a breaker with a nominal wavelength of 1.18 m is used. The water
surface profile at the stream wise vertical center plane of the cube is
measured with a cinematic Laser-Induced Fluorescence technique and the impact
pressures on the front face of the cube are measured with piezoelectric dynamic
pressure transducers. The surface profile measurements and the impact pressure
measurements are synchronized. When the cube is positioned vertically so that
its bottom face is at either $0.5L$ or $0.25L$ below the undisturbed water
surface, the water surface profile behaviors are basically similar with a
nearly circular arc forming between the water contact point on the front face
of the cube and the wave crest. As the impact proceeds, this arc shrinks to
zero size and creates a fast-moving vertical jet in a manner similar to that
found in previous studies of wave impact on bottom-mounted vertical walls. In
the case where the cube is one quarter submerged, a small jet also forms at the
crest and impacts the front face of the cube just before the circular arc
reaches zero size. When the bottom of the cube is located at the undisturbed
water level the wave impact is dramatically different. In this case, it appears
that a packet of air is entrapped during the impact and the surface pressure
subsequently oscillates with a frequency of about 2,000 Hz.

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The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th