具有粘性耗散的饱和达西-布林克曼介质中的磁流对流不稳定性

IF 1.6 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

The European Physical Journal B Pub Date : 2024-07-26 DOI:10.1140/epjb/s10051-024-00738-9

Anil Kumar, D. Bhargavi, P. G. Siddheshwar

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引用次数: 0

摘要

研究了粘性耗散对饱和达西-布林克曼介质中磁流体对流不稳定性的影响。下边界被指定为绝热边界，而上边界为等温边界。数值线性稳定性分析研究了扰动不同倾角水平基流的法向模式。案例研究表明，最不稳定的扰动是水平滚动，这种法向模式的特点是波矢量垂直于主流动方向。水平滚动是最受欢迎的不稳定模式。Barletta 等人的研究还表明，在水磁情况下，水平滚动比任何其他斜滚动模式都更不稳定。这一发现为多孔介质中的 MHD 流体流动和传热行为提供了见解，并对地球科学、工程学和环境科学的应用产生了影响。

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Magnetohydro-convective instability in a saturated Darcy–Brinkman medium with viscous dissipation

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Magnetohydro-convective instability in a saturated Darcy–Brinkman medium with viscous dissipation

The influence of dissipation with viscosity on magnetohydro-convective instability in a saturated Darcy–Brinkman medium is examined. The bottom boundary is designated as adiabatic, whereas the top boundary is isothermal. Numerical linear stability analysis investigates normal modes that disturb the horizontal base flow at different inclinations. The case study shows that the most unstable disturbances are horizontal rolls, normal modes characterized by a wave vector perpendicular to the main flow direction. The horizontal rolls are the favored instability mode. Barletta et al. also showed that horizontal rolls are more unstable than any other oblique roll mode in the hydromagnetic scenario. This finding provides insights into the behavior of MHD fluid flow and heat transfer in porous media, with implications for applications in geoscience, engineering, and environmental science.