Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent structure extraction in turbulent channel flow using boundary
  adapted wavelets   We present a construction of isotropic boundary adapted wavelets, which are
orthogonal and yield a multi-resolution analysis. We analyze direct numerical
simulation data of turbulent channel flow computed at a friction Reynolds
number of 395, and investigate the role of coherent vorticity. Thresholding of
the vorticity wavelet coefficients allows to split the flow into two parts,
coherent and incoherent vorticity. The coherent vorticity is reconstructed from
their few intense wavelet coefficients. The statistics of the coherent part,
i.e., energy and enstrophy spectra, are close to the statistics of the total
flow, and moreover, the nonlinear energy budgets are very well preserved. The
remaining incoherent part, represented by the large majority of the weak
wavelet coefficients, corresponds to a structureless, i.e., noise-like,
background flow whose energy is equidistributed.

1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th