AAS Meeting #193 - Austin, Texas, January 1999
Session 44. Modeling Stellar Characteristics
Display, Thursday, January 7, 1999, 9:20am-6:30pm, Exhibits Hall 1

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[44.05] 3-D Numerical Models of Red Giant Stars

M.L. Jacobs, D.H. Porter, P.R. Woodward (Univ of MN.)

Fully three dimensional and turbulent dynamic numerical simulations of red giant stars are presented. These models directly solve convective motions in the atmosphere of red giants utilizing the Piecewise Parabolic Method (PPM) hydrodynamic code to achieve high effective Reynolds and Rayleigh numbers. Computational meshes as high as 5123 zones are used in order to admit a wide range of dynamically significant scales. These models show highly non-symmetric global dipolar flows within the convective layer of the 'star' as well as distinct radial pulsations driven by non-linear interactions of accoustic waves with convective motions. Spherical harmonics of the radial velocity are dominated by the dipolar (l=1) mode followed, at higher l values, by a spectrum of modes similar to that of a Kolmogorov turbulence spectrum. Details are given on the approximations of the present models as well as on refinements currently being implemented.

If you would like more information about this abstract, please follow the link to http://www.lcse.umn.edu/research/RedGiant/. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

The author(s) of this abstract have provided an email address for comments about the abstract: mjacobs@astro.spa.umn.edu

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