ON THE NONLINEAR-THEORY OF GRAVITATIONAL-INSTABILITY

被引：0
|
作者：
SIMAKOV, SG
机构：
来源：
ASTRONOMICHESKII ZHURNAL | 1993年 / 70卷 / 01期
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中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
An evolution of the velocity field of gravitationally unstable medium is considered. The medium is assumed to be collisional gas. It is shown that perturbations growth is accompanied by typical <<averaging>> due to the pressure work. To describe the nonlinear stage of the instability, we propose modified Burgers equation. The <<viscosity>> coefficient in viscous term of the equation is the combination of the sound velocity and the instability increment. Linearization of the equation results in the correct form of the dispersion relationship of the linear theory.
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页码：10 / 15
页数：6
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