Abstract Details
| status: | file name: | submitted: | by: |
|---|---|---|---|
| approved | rupak_summary.pdf | 2019-02-21 08:08:00 | Rupak Mukherjee |
Abstracts
Author: Rupak Mukherjee
Requested Type: Pre-Selected Invited
Submitted: 2019-03-01 03:12:35
Co-authors: Rajaraman Ganesh, Abhijit Sen
Contact Info:
Institute for Plasma Research, HBNI
Near Indira Bridge, Bhat
Gandhinagar, Gujarat 382428
India
Abstract Text:
Within the framework of MagnetoHydroDynamics, a strong interplay exists between flow and magnetic fields. This interplay is known to lead to several interesting phenomena such as nonlinear non-dispersive Alfven waves, recurrence phenomena and magnetic re-connection, to name a few. Using a set of divergence free sinusoidal flow fields (eg, Arnold-Beltrami-Childress, Taylor-Green, Orszag-Tang etc) as initial flow profile, we numerically integrate a self-consistent set of 3D, weakly compressible MHD equations to study coherent nonlinear Alfven waves. Followed by this we identify a surprisingly new phenomena called ``Recurrence'', within the premise of single fluid MHD equations for chaotic flow fields. Even though it appears counter-intuitive, the strong nonlinearity of the problem allows a selected initial flow fields to periodically reconstruct its structures despite the fact that its structure is completely distorted during the evolution of the plasma. The magnetic recurrence phenomena mediated by a dynamical energy exchange between magnetic and velocity fields via a reconnection process is believed to have wide applications in controlling the disruptions in the magnetically confined plasmas. After demonstrating the numerical convergence, we attempt possible explanation using Hamiltonian field models.
References:
1. Rupak Mukherjee, Rajaraman Ganesh, Abhijit Sen, Physics of Plasmas, 26, 022101 (2019)
2. Rupak Mukherjee, Rajaraman Ganesh, Abhijit Sen, arXiv: 1811.00744
3. Rupak Mukherjee, Rajaraman Ganesh, Vinod Saini, Udaya Maurya, Nagavijayalakshmi Vydyanathan, Bharatkumar Sharma, IEEE Conference Proceedings of 25th International Conference on High Performance Computing Workshops (HiPCW), 2018
Comments:
Computer Simulation of Plasmas
