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Multifluid Kelvin-Helmholtz instability in weakly ionised astrophysical plasmas

Jones, Aoife Clare (2011) Multifluid Kelvin-Helmholtz instability in weakly ionised astrophysical plasmas. PhD thesis, Dublin City University.

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Abstract

By expanding on the principles of ideal magnetohydrodynamics (MHD), we examine the dynamics of weakly ionised astrophysical plasma flows in a multifluid regime. This numerical study is carried out using the multifluid MHD code HYDRA. An outline of the structure of this code is given in chapter 2 and the schemes which are implemented integrates the MHD equations. We are interested in multifluid effects on fluid instabilities, in particular the Kelvin-Helmholtz (KH) instability. The KH instability could, for example, play a role in the momentum transfer between the bowshock of a protostellar jet and its surrounding molecular cloud. In particular, changes to the development of the KH instability as a result of including the multlifluid effects of ambipolar diffusion and the Hall effect are isolated and individually studied in chapters 4 and 5 respectively. Finally, chapter 6 provides an in-depth examination of the respective roles these nonideal effects have in a multifluid astrophysical system in which both are expected to occur, such as a molecular cloud. Multifluid effects on protostellar jets are then examined in a broader context in chapter 7. As a jet propagates into a molecular cloud, it forms a bowshock of swept-up ambient material. As the molecular cloud material is weakly ionised, the bowshock is strongly susceptible to nonideal MHD effects below some characteristic length scale. Large-scale 3D simulations allow us to begin to understand the resulting dynamical differences in both the jet propagation and the structural evolution of the magnetic fields.

Item Type:Thesis (PhD)
Date of Award:2011
Refereed:No
Supervisor(s):Downes, Turlough P.
Subjects:Physical Sciences > Astronomy > Astrophysics
Physical Sciences > Plasmas
Mathematics
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Mathematical Sciences
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 License. View License
Funders:HEA PRTLI III
ID Code:16069
Deposited On:06 Apr 2011 16:54 by Turlough Downes. Last Modified 09 Dec 2011 12:04

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