Statistics – Computation
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..293l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, March 15, 1990, p. 293-311. Research supported by
Statistics
Computation
66
Computational Astrophysics, Gravitation, Homogeneous Turbulence, Supersonic Flow, Turbulence Effects, Turbulent Flow, Compressible Flow, Energy Transfer, Gravitational Collapse, Mach Number, Velocity Distribution, Wave Interaction
Scientific paper
Interstellar cloud lifetimes much larger than their free-fall time may be explained in view of the modifications induced in gravitational instability by turbulence. While the vortex component of turbulence may only modify Jeans' criterion by enlarging the scale of the instability, the transfer of potential component energy downward to small scales of the flow can directly compete with collapse, and may in fact hinder it. The customary evaluation of the characteristic parameters of the turbulent flow must be modified in order to take wave-wave interactions into account in the computation of the relevant energy transfer time; this analysis, in the acoustic regime, can be expanded to supersonic flows in which the transfer time is independent of scale.
Leorat Jacques
Passot Thierry
Pouquet Annick
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