Numerical and experimental investigation of particle terminal velocity and aggregation in volcanic plumes
Recent eruptions, such as Eyjafjallajökull 2010 (Iceland), have strikingly underlined the vulnerability of our highly globalized societies and highlighted significant shortcomings in schemes currently used to forecast the dispersal of volcanic ash. Thus, for the development of appropriate preparedne...
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ftunivgeneve:oai:unige.ch:aou:unige:77593 2023-10-01T03:55:50+02:00 Numerical and experimental investigation of particle terminal velocity and aggregation in volcanic plumes Bagheri, Gholamhossein Bonadonna, Costanza 2015 https://archive-ouverte.unige.ch/unige:77593 https://doi.org/10.13097/archive-ouverte/unige:77593 eng eng Université de Genève https://archive-ouverte.unige.ch/unige:77593 unige:77593 doi:10.13097/archive-ouverte/unige:77593 urn:nbn:ch:unige-775938 info:eu-repo/semantics/openAccess info:eu-repo/classification/ddc/550 info:eu-repo/semantics/doctoralThesis Text Thèse 2015 ftunivgeneve https://doi.org/10.13097/archive-ouverte/unige:77593 2023-09-07T07:28:37Z Recent eruptions, such as Eyjafjallajökull 2010 (Iceland), have strikingly underlined the vulnerability of our highly globalized societies and highlighted significant shortcomings in schemes currently used to forecast the dispersal of volcanic ash. Thus, for the development of appropriate preparedness and mitigation strategies it is important to have a better assessment and understanding of particle sedimentation and aggregation. In this thesis, first a 4-meter high vertical wind tunnel is introduced that is designed to study the aero-dynamical behavior of non-spherical particles. In the next step, existing protocols for the study of size and shape of irregular particles are assessed and new strategies are introduced. In addition, a new general model for estimating the drag coefficient of freely falling non-spherical solid particles is presented. Finally, by applying a state-of-the-art combination of field and numerical strategies the aggregation of volcanic particles is investigated. Doctoral or Postdoctoral Thesis Eyjafjallajökull Iceland Université de Genève: Archive ouverte UNIGE |
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English |
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info:eu-repo/classification/ddc/550 Bagheri, Gholamhossein Numerical and experimental investigation of particle terminal velocity and aggregation in volcanic plumes |
topic_facet |
info:eu-repo/classification/ddc/550 |
description |
Recent eruptions, such as Eyjafjallajökull 2010 (Iceland), have strikingly underlined the vulnerability of our highly globalized societies and highlighted significant shortcomings in schemes currently used to forecast the dispersal of volcanic ash. Thus, for the development of appropriate preparedness and mitigation strategies it is important to have a better assessment and understanding of particle sedimentation and aggregation. In this thesis, first a 4-meter high vertical wind tunnel is introduced that is designed to study the aero-dynamical behavior of non-spherical particles. In the next step, existing protocols for the study of size and shape of irregular particles are assessed and new strategies are introduced. In addition, a new general model for estimating the drag coefficient of freely falling non-spherical solid particles is presented. Finally, by applying a state-of-the-art combination of field and numerical strategies the aggregation of volcanic particles is investigated. |
author2 |
Bonadonna, Costanza |
format |
Doctoral or Postdoctoral Thesis |
author |
Bagheri, Gholamhossein |
author_facet |
Bagheri, Gholamhossein |
author_sort |
Bagheri, Gholamhossein |
title |
Numerical and experimental investigation of particle terminal velocity and aggregation in volcanic plumes |
title_short |
Numerical and experimental investigation of particle terminal velocity and aggregation in volcanic plumes |
title_full |
Numerical and experimental investigation of particle terminal velocity and aggregation in volcanic plumes |
title_fullStr |
Numerical and experimental investigation of particle terminal velocity and aggregation in volcanic plumes |
title_full_unstemmed |
Numerical and experimental investigation of particle terminal velocity and aggregation in volcanic plumes |
title_sort |
numerical and experimental investigation of particle terminal velocity and aggregation in volcanic plumes |
publisher |
Université de Genève |
publishDate |
2015 |
url |
https://archive-ouverte.unige.ch/unige:77593 https://doi.org/10.13097/archive-ouverte/unige:77593 |
genre |
Eyjafjallajökull Iceland |
genre_facet |
Eyjafjallajökull Iceland |
op_relation |
https://archive-ouverte.unige.ch/unige:77593 unige:77593 doi:10.13097/archive-ouverte/unige:77593 urn:nbn:ch:unige-775938 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.13097/archive-ouverte/unige:77593 |
_version_ |
1778524619342348288 |