{"id":{"repo_id":"dcu","oai_identifier":"oai:doras.dcu.ie:16069"},"canonical_url":"https://search.dev.ndltd.org/etd/dcu/oai:doras.dcu.ie:16069","repository":{"repo_id":"dcu","name":"Dublin City University","base_url":"http://doras.dcu.ie/cgi/oai2"},"display":{"title":"Multifluid Kelvin-Helmholtz instability in weakly ionised astrophysical plasmas","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.","abstract_html":"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.","abstract_has_math":false,"creators":["Jones, Aoife Clare"],"institution":"Dublin City University","degree_name":"phd","degree_level":"doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011","date_published":"2011","updated_at":"2026-07-24T06:26:27Z","subjects":["Astrophysics","Plasmas","Mathematics"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.sponsor","label":"Sponsor","values":["HEA PRTLI III"]},{"key":"dc:creator","label":"Author","values":["Jones, Aoife Clare"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011"]},{"key":"dc:date.issued","label":"Date","values":["2011"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["Dublin City University"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://doras.dcu.ie/16069/"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["doctoral"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["phd"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Astrophysics","Plasmas","Mathematics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://doras.dcu.ie/16069/1/ACJones_corrected.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Multifluid Kelvin-Helmholtz instability in weakly ionised astrophysical plasmas"]}]}],"canonical_facts":{"dc:contributor.sponsor":["HEA PRTLI III"],"dc:creator":["Jones, Aoife Clare"],"dc:date":["2011"],"dc:date.issued":["2011"],"dc:description.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."],"dc:format":["application/pdf"],"dc:identifier.uri":["https://doras.dcu.ie/16069/1/ACJones_corrected.pdf"],"dc:language":["en"],"dc:publisher.institution":["Dublin City University"],"dc:relation.isreferencedby":["https://doras.dcu.ie/16069/"],"dc:subject":["Astrophysics","Plasmas","Mathematics"],"dc:title":["Multifluid Kelvin-Helmholtz instability in weakly ionised astrophysical plasmas"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["doctoral"],"dc:type.qualificationname":["phd"]},"updated_at":"2026-07-24T06:26:27Z"}