تقرير
Turbulent Drag Reduction in Magnetohydrodynamic Turbulence and Dynamo from Energy Flux Perspectives
| العنوان: | Turbulent Drag Reduction in Magnetohydrodynamic Turbulence and Dynamo from Energy Flux Perspectives |
|---|---|
| المؤلفون: | Verma, Mahendra K., Sharma, Manohar K., Chatterjee, Soumyadeep |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics Physics (Other) |
| مصطلحات موضوعية: | Physics - Plasma Physics, Astrophysics - Solar and Stellar Astrophysics, Physics - Fluid Dynamics, Physics - Space Physics |
| الوصف: | In this review, we describe turbulent drag reduction in a variety of flows using a universal framework of energy flux. In a turbulent flow with dilute polymers and magnetic field, the kinetic energy injected at large scales cascades to the velocity field at intermediate scales, as well as to the polymers and magnetic field at all scales. Consequently, the kinetic energy flux, $ \Pi_u(k) $, is suppressed in comparison to the pure hydrodynamic turbulence. We argue that the suppression of $\Pi_u(k)$ is an important factor in the reduction of the inertial force $\langle {\bf u \cdot \nabla u} \rangle$ and \textit{turbulent drag}. This feature of turbulent drag reduction is observed in polymeric, magnetohydrodynamic, quasi-static magnetohydrodynamic, and stably-stratified turbulence, and in dynamos. In addition, it is shown that turbulent drag reduction in thermal convection is due to the smooth thermal plates, similar to the turbulent drag reduction over bluff bodies. In all these flows, turbulent drag reduction often leads to a strong large-scale velocity in the flow. Comment: 52 pages, submitted to Reviews of Modern Plasma Physics |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2301.01281 |
| رقم الأكسشن: | edsarx.2301.01281 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |