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Astromodal wave dynamics in multifluidic structure-forming cloud complexes
Pramana ( IF 1.9 ) Pub Date : 2021-02-06 , DOI: 10.1007/s12043-020-02031-7
A Haloi , P K Karmakar

The evolutionary dynamics of bimodal pulsational mode, arising because of the long-range conjugational gravito-electrostatic interplay in viscoelastic polytropic complex multicomponent astroclouds with partial ionisation, is classically examined using a non-relativistic generalised hydrodynamic model approach. The equilibrium distribution of the diversified constitutive species forms a globally quasi-neutral hydrostatic homogeneous configuration. The primitive set of the astrocloud structuring equations specifically includes polytropic (hydrodynamic action) and nonlinear logatropic barotropic (turbulence action) effects simultaneously. A normal mode analysis over the perturbed cloud results in a unique form of sextic polynomial dispersion relation with variable poly-parametric coefficients. A numerical analysis technique is provided to show the exact nature of the modified viscoelastic (turbo-viscoelastic) pulsational mode in the two extreme hydrodynamic and kinetic regimes. It is seen that, in the former regime, the dust–charge ratio (negatively-to-positively charged grains) plays a destabilising role to the instability. In contrast, the dust–mass ratio (negatively-to-positively charged grains) develops a stabilising influence in the wave-dynamical processes. In the latter regime, the viscoelastic relaxation velocity associated with the positively charged grains acts as an amplitude stabiliser. Conversely, the viscoelastic relaxation velocity of the negatively charged grain fluid introduces destabilising influences. The unique features of the propagatory and non-propagatory mode characteristics are elaborately illustrated. The reliability of the investigated results is judiciously validated by comparing the results with the specific reports available in the literature. Lastly, the first-hand astronomical implications and applications of our study are summarily outlined.



中文翻译:

多流结构形成云复合物中的星状波动力学

经典地使用非相对论的广义流体动力学模型方法研究了双峰脉动模态的演化动力学,该动力学是由于粘弹性的多变复杂多组分天文云中具有部分电离的远距离共轭重力-静电相互作用而引起的。多样化的本构物种的平衡分布形成整体准中性静水均质构型。天文云结构方程的原始集合特别包含多变(水动力作用)和非线性对数正压(湍流作用)效应。在扰动云上进行正态模式分析会得出具有可变多参数系数的六项多项式色散关系的唯一形式。提供了一种数值分析技术,以显示在两种极端水动力和动力学状态下,改进的粘弹性(涡轮-粘弹性)脉动模式的确切性质。可以看出,在前一种状态下,粉尘-装料比(带负电的谷物)对不稳定性起着不稳定的作用。相反,粉尘质量比(带负电的颗粒)在波动过程中产生稳定的影响。在后一种情况下,与带正电的晶粒相关的粘弹性松弛速度充当振幅稳定器。相反,带负电的谷物流体的粘弹性松弛速度会引入不稳定的影响。详细说明了传播和非传播模式特征的独特特征。通过将结果与文献中提供的特定报告进行比较,可以明智地验证研究结果的可靠性。最后,概述了我们研究的第一手天文意义和应用。

更新日期:2021-02-07
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