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dc.contributor.authorHaghighat, Alien_US
dc.date.accessioned2017-10-17T08:00:58Z
dc.date.available2017-10-17T08:00:58Z
dc.date.issued2017-10-16en_US
dc.identifier.othervt_gsexam:12924en_US
dc.identifier.urihttp://hdl.handle.net/10919/79672
dc.description.abstractOver the past century, great strides have been made in the advancement of mine fire knowledge since the 1909 Cherry Mine Fire Disaster, one of the worst in U.S. history. However, fire hazards remain omnipresent in underground coal mines in the U.S. and around the world. A precise fire numerical analysis (simulation) before any fire events can give a broad view of the emergency scenarios, leading to improved emergency response, and better health and safety outcomes. However, the simulation cost of precise large complex dynamical systems such as fire in underground mines makes practical and even theoretical application challenging. This work details a novel methodology to reduce fire and airflow simulation costs in order to make simulation of complex systems around fire and mine ventilation systems viable. This study will examine the development of a Reduced Order Model (ROM) to predict the flow field of an underground mine geometry using proper orthogonal decomposition (POD) to reduce the airflow simulation cost in a nonlinear model. ROM proves to be an effective tool for approximating several possible solutions near a known solution, resulting in significant time savings over calculating full solutions and suitable for ensemble calculations. In addition, a novel iterative methodology was developed based on the physics of the fluid structure, turbulent kinetic energy (TKE) of the dynamical system, and the vortex dynamics to determine the interface boundary in multiscale (3D-1D) fire simulations of underground space environments. The proposed methodology was demonstrated to be a useful technique for the determination of near and far fire fields, and could be applied across a broad range of flow simulations and mine geometries. Moreover, this research develops a methodology to analyze the tenable limits in a methane fire event in an underground coal mine for bare-faced miners, mine rescue teams, and fire brigade teams in order to improve safety and training of personnel trained to fight fires. The outcomes of this research are specific to mining although the methods outlined might have broader impacts on the other fields such as tunneling and underground spaces technology, HVAC, and fire protection engineering industries.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis item is protected by copyright and/or related rights. Some uses of this item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectFire Simulation Cost Reductionen_US
dc.subjectFire in Underground Space Environmentsen_US
dc.subjectMultiscale Methodologyen_US
dc.subjectReduced Order Model (ROM)en_US
dc.subjectProper Orthogonal Decomposition (POD)en_US
dc.subjectRoad Tunnel Fireen_US
dc.subjectMine Fireen_US
dc.subjectTenability Analysisen_US
dc.titleFire Simulation Cost Reduction for Improved Safety and Response for Underground Spacesen_US
dc.typeDissertationen_US
dc.contributor.departmentMining Engineeringen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineMining Engineeringen_US
dc.contributor.committeechairLuxbacher, Kramer Davisen_US
dc.contributor.committeechairLattimer, Brian Y.en_US
dc.contributor.committeememberSchafrik, Steven J.en_US
dc.contributor.committeememberRipepi, Nino S.en_US


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