2024/07/20 by Shishir Biswas, R. Ganesh, Biswas, Shishir +1
Biochemistry, Genetics and Molecular Biology · Engineering · Physics and Astronomy · #Astrophysics of Galaxies (astro-ph.GA) #Characterization and Applications of Magnetic Nanoparticles #Computational Physics (physics.comp-ph) #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Geomagnetism and Paleomagnetism Studies #Plasma Physics (physics.plasm-ph) #Theoretical and Computational Physics
paper · pdf · doi:10.48550/arxiv.2407.14810
openalex publication_date 2024/07/20 · openalex created_date 2025/01/05 · openalex updated_date 2026/07/28
In the self-consistent dynamo limit, the magnetic feedback on the velocity field is sufficiently strong to induce a change in the topology of the magnetic field. Consequently, the magnetic energy reaches a state of non-linear saturation. Here, we investigate the role played by helical and non-helical drives in the triggering and the eventual saturation of a self-consistent dynamo. Evidence of small-scale dynamo (SSD) activity is found for both helical and non-helical forcing, driven at the largest possible scale. Based on the spectrum analysis, we find that the evolution of kinetic energy follows Kolmogorov's k-(5)/(3) law while that of magnetic energy follows Kazantsev's k(3)/(2) scaling. Also, we have verified that the aforementioned scalings remain valid for various magnetic Prandtl numbers (Pm). Statistical analysis is found to support our numerical finds.