Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detonation initiation by compressible turbulence thermodynamic
  fluctuations   Theory and computations have established that thermodynamic gradients created
by hot spots in reactive gas mixtures can lead to spontaneous detonation
initiation. However, the current laminar theory of the temperature-gradient
mechanism for detonation initiation is restricted to idealized physical
configurations. Thus, it only predicts conditions for the onset of detonations
in quiescent gases, where an isolated hot spot is formed on a timescale shorter
than the chemical and acoustic timescales of the gas. In this work, we extend
the laminar temperature-gradient mechanism into a statistical model for
predicting the detonability of an autoignitive gas experiencing compressible
isotropic turbulence fluctuations. Compressible turbulence forms non-monotonic
temperature fields with tightly-spaced local minima and maxima that evolve over
a range of timescales, including those much larger than chemical and acoustic
timescales. We examine the utility of the adapted statistical model through
direct numerical simulations of compressible isotropic turbulence in premixed
hydrogen-air reactants for a range of conditions. We find strong, but not
conclusive, evidence that the model can predict the degree of detonability in
an autoignitive gas due to turbulence-induced thermodynamic gradients.

12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex