Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recording of Leray-type singular events in a high speed wind tunnel   It has long been suspected that flows of incompressible fluids at very large
or infinite Reynolds may present finite time singularities. We review briefly
the theoretical situation on this point. Then we show that single point records
of velocity fluctuations in the Modane wind tunnel show correlations between
large velocities and large accelerations that are in agreement with the scaling
laws for such singularities as derived by Leray in 1934. Conversely the
experimental correlations between velocity and acceleration are not explainable
by Kolmogorov scalings. This implies in particular that the singularities
cannot be seen as the end of a cascade in the sense of Kolmogorov, but are best
described as singular events in the sense of Leray.

32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th