Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation and Breakdown of Surface Streaks in Wind-Driven Aqueous Flow   A bypass transition scenario in a wind-stress driven aqueous flow is analysed
using a temporally developing boundary layer model with accelerating surface
drift velocity. The parameters of the model are selected to mimic a wave-tank
experiment with a reference wind speed of 5 m/s. To study the boundary layer
processes in isolation, a flat free surface is adapted, which inhibits the
initiation of waves. First, preferred initial perturbations to which the
boundary layer is the most sensitive are identified using linear non-normal
growth theory. These perturbations are arranged as streamwise-constant vortex
pairs located adjacent to the free surface. Subsequently, direct numerical
simulations are initialized with these optimal perturbations and streamwise
streaks are generated. High-speed streaks penetrate into deeper water layers
and undergo sinuous instabilities reminiscent of the instabilities developing
on low-speed streaks in wall-bounded flows. Streak instabilities induce lateral
undulations at the free surface, which closely resemble the dye patterns before
the onset of waves in wind-wave-tank experiments. The present analysis provides
a theoretical background for these experimental observations.

21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg