Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47..451n&link_type=abstract
Publications of the Astronomical Society of Japan, v.47, p.451-461.
Astronomy and Astrophysics
Astronomy
3
Accretion Disks, Hydrodynamics, Turbulence
Scientific paper
This paper treats the problem of how viscous heating in accretion disks changes in the vertical direction. It is assumed that the disk is isothermal and that the turbulence is homogeneous in the horizontal-plane. The model of turbulence applied is a three-equation model by Yoshizawa (1992, Phys. Rev. A46, 3292), an extension of the so-called K--varepsilon model, which is well known in engineering fields. It gives a set of differential equations which describe the vertical dependences of the turbulent kinetic energy (K), the dissipation rate (varepsilon ), and the density variance (K_d). It turns out that the turbulent kinetic energy (per unit mass) and the so-called alpha -value generally increases from the equator toward the surface by turbulent diffusion. This is consistent with our previous results obtained by a different method. Near to the surface, however, the values of K and varepsilon may decrease outwards, if model constants representing the effects of the compressibility of turbulence are estimated to be large. Physical explanations of the results are briefly presented.
Kato Shoji
Nakao Yasushi
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