Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effects of surface tension reduction on wind-wave growth and air-water
  scalar transfer   Effect of surface tension reduction on wind-wave growth is investigated using
direct numerical simulation (DNS) of air-water two-phase turbulent flow. The
incompressible Navier-Stokes equations for air and water sides are solved using
an arbitrary Lagrangian-Eulerian method with boundary-fitted moving grids. The
wave growth is simulated for two cases of different surface tensions. The
results show that significant wave height for the smaller surface tension case
increases faster than that for the larger surface tension case. Energy fluxes
for gravity and capillary wave scales reveal that, when the surface tension is
reduced, the energy transfer from the significant gravity waves to capillary
waves decreases and the significant waves accumulate more energy supplied by
wind. This results in faster wave growth for the smaller surface tension case.
Effect on the scalar transfer across the air-water interface is also
investigated. The results show that the scalar transfer coefficient on the
water side decreases due to the surface tension reduction. The decrease is
caused by suppression of turbulence in the water side. In order to support the
conjecture, the surface tension effect is compared with laboratory experiments
in a small wind-wave tank.

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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: hep-ph
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The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin