Detailed Information on Publication Record
2023
Accretion disc backflow in resistive MHD simulations
MISHRA, R., Miljenko ČEMELJIĆ and Wlodzimierz KLUŹNIAKBasic information
Original name
Accretion disc backflow in resistive MHD simulations
Authors
MISHRA, R., Miljenko ČEMELJIĆ (191 Croatia, belonging to the institution) and Wlodzimierz KLUŹNIAK (616 Poland)
Edition
Monthly Notices of the Royal Astronomical Society, 2023, 0035-8711
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Country of publisher
United Kingdom of Great Britain and Northern Ireland
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
RIV identification code
RIV/47813059:19630/23:A0000262
Organization unit
Institute of physics in Opava
UT WoS
001019516400005
Keywords in English
accretion; accretion discs;magnetic fields;(magnetohydrodynamics) MHD;methods: numerical
Tags
International impact, Reviewed
Links
GX21-06825X, research and development project.
Změněno: 14/2/2024 11:18, Mgr. Pavlína Jalůvková
Abstract
V originále
We investigate accretion onto a central star, with the size, rotation rate, and magnetic dipole of a young stellar object, to study the flow pattern (velocity and density) of the fluid within and outside of the disc. We perform resistive magnetohydrodynamic (MHD) simulations of thin discs, varying the parameters such as the stellar rotation rate and (anomalous) coefficients of viscosity and resistivity in the disc. To provide a benchmark for the results and to compare them with known analytic results, we also perform purely hydrodynamic (HD) simulations for the same problem. Although obtained for different situations with differing inner boundary condition, the disc structure in the HD simulations closely follows the analytic solution of Kluzniak and Kita - in particular, a region of 'mid-plane' backflow exists in the right range of radii, depending on the viscosity parameter. In the MHD solutions, whenever the magnetic Prandtl number does not exceed a certain critical value, the mid-plane backflow exists throughout the accretion disc, extending all the way down to the foot point of the accretion funnel flow where the disc transitions to a magnetic funnel flow. For values of the magnetic Prandtl number close to the critical value the backflow and the inner disc undergo a quasi-periodic radial oscillation, otherwise the backflow is steady, as is the disc solution. From our results, supplemented by our reading of the literature, we suggest that mid-plane backflow is a real, physical, and not only numerical feature of at least some accretion discs.