Solenoidal versus compressive turbulence forcing

Details Solenoidal versus compressive turbulence forcing Solenoidal versus compressive turbulence forcing

2009-10-28

arxiv.org/abs/0910.5469v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

1 page, to appear in the proceedings of the IAU General Assembly Joint Discussion 14 "FIR2009: The ISM of Galaxies in the Far-

Scientific paper

We analyze the statistics and star formation rate obtained in high-resolution numerical experiments of forced supersonic turbulence, and compare with observations. We concentrate on a systematic comparison of solenoidal (divergence-free) and compressive (curl-free) forcing, which are two limiting cases of turbulence driving. Our results show that for the same RMS Mach number, compressive forcing produces a three times larger standard deviation of the density probability distribution. When self-gravity is included in the models, the star formation rate is more than one order of magnitude higher for compressive forcing than for solenoidal forcing.

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