Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinetic helicity decay in linearly forced turbulence   The decay of kinetic helicity is studied in numerical models of forced
turbulence using either an externally imposed forcing function as an
inhomogeneous term in the equations or, alternatively, a term linear in the
velocity giving rise to a linear instability. The externally imposed forcing
function injects energy at the largest scales, giving rise to a turbulent
inertial range with nearly constant energy flux while for linearly forced
turbulence the spectral energy is maximum near the dissipation wavenumber.
Kinetic helicity is injected once a statistically steady state is reached, but
it is found to decay on a turbulent time scale regardless of the nature of the
forcing and the value of the Reynolds number.

2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph