Local stability analysis of interface region of astrophysical viscous shear flows with a gradual velocity gradient
| Autor: | Hassan Mehdian, M. Mahdavi-Gharavi, K. Hajisharifi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Atmospheric Science 010504 meteorology & atmospheric sciences Linear perturbation theory Velocity gradient Viscous shear Aerospace Engineering Astronomy and Astrophysics Plasma Mechanics 01 natural sciences Solar wind Geophysics Shear (geology) Viscosity coefficient Space and Planetary Science Excited state 0103 physical sciences General Earth and Planetary Sciences 010303 astronomy & astrophysics 0105 earth and related environmental sciences |
| Zdroj: | Advances in Space Research. 65:1607-1614 |
| ISSN: | 0273-1177 |
| Popis: | In this paper, we extend the stability analysis of cold sharp shear flows to warm astrophysical cases with, inevitable, gradual velocity gradient in the interface region in the presence of viscosity effect. Using linear perturbation theory as well as the local approximation method, the instability growth rate of the excited electromagnetic modes has been investigated for the relativistic and non-relativistic cases of solar wind interacting with interstellar plasma medium. Results show that astrophysical shear systems with a small velocity gradient in the transition region are more stable rather than larger ones. Moreover, dependent on the viscosity coefficient value, the viscosity effects could have a positive role on the instability growth rate of the system in some range of initial bulk velocity, while it plays a destructive role in other velocity ranges. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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