Interstellar turbulent velocity fields: Scaling properties, synthesis and effects on chemistry
N. Décamp, J. Le Bourlot;
AaA, 2002, 389, 1055
ABSTRACT:Turbulence is thought to play a key role in the dynamics of interstellar clouds.
Here, we do not seek to explain its origin or decipher the mechanisms that
maintain it, but we start from the observational fact that it is
present.
Arnéodo et al.
have developped a method based on wavelet analysis to study
incompressible turbulence experiments.
We propose to use this method with the same
propagator to derive quantitative information on the structure of a turbulent
field.
Then we build a synthetic velocity field with the same statistical
properties and we show that a reactive fluid subject to turbulent forcing exhibits
self-organised structures that depend on the chemical species considered.
Such
effects could explain why observational evidence shows that the bulk of the
mass is distributed smoothly whereas some chemical species are extremely
patchy.
Figures D.1 to D.4 are only available in electronic form at
http://www.edpsciences.org
KEYWORDS: turbulence, methods: numerical, ism: general, ism: molecules, ism: structure
PERSOKEY:turbulence, ,
CODE: decamp2002