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Turbulent convection model of the sun , and the problem of density inversion

Author: ZhangQianSheng
Tutor: LiZuo
School: Graduate School , Chinese Academy of Sciences (Yunnan Observatory )
Course: Astrophysics
Keywords: Solar models Mixing-length theory Temperature gradient Model parameters Vibration frequency Convection zone Stellar interiors Diffusion coefficient Density Turbulent convective
CLC: P182
Type: Master's thesis
Year: 2008
Downloads: 8
Quote: 0
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Abstract


Stellar interior convection problems , a lot of advantages compared to the classical model of turbulent convection mixing-length theory , considering a lot of mixing-length theory ignores the effect . Turbulent convection model consists of a set of parameters , they determine the nature of turbulent convection is essential. Turbulent convection model itself does not give them the value of the fluid dynamics experiments given experience value , but the physical conditions of the stellar interior ground laboratory differ materially study stellar internal convection , these values ??are not necessarily very good choice. The main goal of this paper is to be able to apply in stellar turbulent convection model parameters . In order to achieve this goal, we study the sun , computing the different turbulent convection model parameters under solar models and their p- mode vibration frequency and contrast to the observations , in order to estimate the range of the turbulent convection model parameters . Select the appropriate turbulent convection model parameters , the p - mode vibration frequency of errors in the whole frequency band than using the mixing-length theory , we found to be smaller than 30%. Density inversion phenomenon is also discussed in this paper . This phenomenon is due to the potential energy for a maximum value when the density reversing unstable. This article discusses the causes and conditions of the physical density inversion phenomenon , this phenomenon occurred criterion ▽ > the ▽ _ρ , it is only likely to occur in the superadiabatic convection zone . The impact of turbulent convection model parameters on the temperature gradient ▽ we calculate happened to density inversion of the critical parameters of the solar models , to discover whether a density inversion depends primarily on the size of the diffusion coefficient in the turbulent convection model parameters .

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CLC: > Astronomy,Earth Sciences > Astronomy > Solar system > Solar physics
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