Skip to main content

The distribution of shock waves in driven supersonic turbulence

Smith, M.D., Mac Low, M.-M., Heitsch, F. (2000) The distribution of shock waves in driven supersonic turbulence. Astronomy and Astrophysics, 362 (1). pp. 333-341. ISSN 0004-6361. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://www.scopus.com/inward/record.url?eid=2-s2.0...

Abstract

Supersonic turbulence generates distributions of shock waves. Here, we analyse the shock waves in three-dimensional numerical simulations of uniformly driven supersonic turbulence, with and without magnetohydrodynamics and self-gravity. We can identify the nature of the turbulence by measuring the distribution of the shock strengths. We find that uniformly driven turbulence possesses a power law distribution of fast shocks with the number of shocks inversely proportional to the square root of the shock jump speed. A tail of high speed shocks steeper than Gaussian results from the random superposition of driving waves which decay rapidly. The energy is dissipated by a small range of fast shocks. These results contrast with the exponential distribution and slow shock dissipation associated with decaying turbulence. A strong magnetic field enhances the shock number transverse to the field direction at the expense of parallel shocks. A simulation with self-gravity demonstrates the development of a number of highly dissipative accretion shocks. Finally, we examine the dynamics to demonstrate how the power-law behaviour arises.

Item Type: Article
Uncontrolled keywords: Hydrodynamics, ISM: clouds, ISM: kinematics and dynamics, Shock waves, Turbulence
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Giles Tarver
Date Deposited: 11 Aug 2015 10:15 UTC
Last Modified: 29 May 2019 15:55 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50135 (The current URI for this page, for reference purposes)
  • Depositors only (login required):