{"683245":{"#nid":"683245","#data":{"type":"event","title":"MS Proposal by Hruday Shah","body":[{"value":"\u003Cp\u003EHruday Shah\u003Cbr\u003EAdvisor: Dr. Suresh Menon\u003Cbr\u003Ewill propose a master\u2019s thesis entitled,\u003Cbr\u003EHigh-Explosive Detonation-Driven Simulant Decomposition in Confined\u003Cbr\u003EEnvironments\u003Cbr\u003EOn\u003Cbr\u003EMonday, July 28th at 11:00 a.m.\u003Cbr\u003EMontgomery Knight Building 317\u003Cbr\u003E270 Ferst Dr, Atlanta, GA 30332\u003Cbr\u003EAbstract\u003Cbr\u003EWhen high explosives (HE) detonate, a leading blast wave is formed and propagates outward. In\u003Cbr\u003Econfined lab-scale geometries, before this wave can reflect off the walls, expansion pressure waves\u003Cbr\u003Egenerated behind the front will travel in the opposite direction and reflect from the initial source as a reshock.\u003Cbr\u003EThis re-shock interacts with the evolving shear layers, enhancing post-detonation mixing, still\u003Cbr\u003Ebefore the initial blast wave reflects. Shear-layer instabilities, particularly Kelvin\u2013Helmholtz instability\u003Cbr\u003E(KHI) and Rayleigh\u2013Taylor instability (RTI), are triggered by the velocity and density gradients in the flow,\u003Cbr\u003Eand when perturbed by the re-shock, can give rise to Richtmyer\u2013Meshkov instability (RMI). These\u003Cbr\u003Einstabilities enhance mixing between detonation products and ambient gases. If a surrogate species is\u003Cbr\u003Eintroduced into the ambient domain, mixing and decomposition occur, independent of direct blast wave\u003Cbr\u003Einteraction. However, the mixing and decomposition behavior of such simulants in confined postdetonation\u003Cbr\u003Egeometries remains poorly understood, and limited numerical studies exist, due to the lack\u003Cbr\u003Eof data, especially on simulant decomposition kinetics.\u003Cbr\u003ETo address some of these gaps, this thesis proposes a numerical investigation of confined HE\u003Cbr\u003Edetonations and modeling post-blast mixing and decomposition of simulant gas. The effects of varying\u003Cbr\u003Einitial simulant conditions on mixing and decomposition will also be evaluated across both short- and\u003Cbr\u003Elong-time scales. For the numerical modeling framework, a confined spherical blast is modeled using the\u003Cbr\u003Esemi-empirical Jones-Wilkins-Lee (JWL) Equation of State and finite-rate reduced-order kinetics for\u003Cbr\u003Eafterburning. If the simulant and ambient gases are turbulent, large-eddy-simulation (LES) will be used;\u003Cbr\u003Eotherwise, no turbulent modeling will be used. This framework is verified against experimental data.\u003Cbr\u003EThis numerical framework is then also applied to a lab-scale cylindrical chamber with a generic two-step\u003Cbr\u003Ekinetics model for simulant decomposition. Initial simulations reveal that the simulant placement\u003Cbr\u003Esignificantly affects mixing rates, while geometry influences mean temperature. It is shown that the\u003Cbr\u003Emean simulant temperature is a key driver for decomposition. Additional configurations, based on\u003Cbr\u003Eplanned experiments at the University of Illinois, will be modeled to further verify and characterize\u003Cbr\u003Ethese findings.\u003Cbr\u003ECommittee\u003Cbr\u003E\uf0b7 Dr. Suresh Menon \u2013 School of Aerospace Engineering\u003Cbr\u003E\uf0b7 Dr. Joseph Oefelein \u2013 School of Aerospace Engineering\u003Cbr\u003E\uf0b7 Dr. Lakshmi Sankar \u2013 School of Aerospace Engineering\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EHigh-Explosive Detonation-Driven Simulant Decomposition in Confined\u003Cbr\u003EEnvironments\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"High-Explosive Detonation-Driven Simulant Decomposition in Confined Environments"}],"uid":"27707","created_gmt":"2025-07-23 17:48:32","changed_gmt":"2025-07-23 17:49:19","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2025-07-28T11:00:00-04:00","event_time_end":"2025-07-28T13:00:00-04:00","event_time_end_last":"2025-07-28T13:00:00-04:00","gmt_time_start":"2025-07-28 15:00:00","gmt_time_end":"2025-07-28 17:00:00","gmt_time_end_last":"2025-07-28 17:00:00","rrule":null,"timezone":"America\/New_York"},"location":"Montgomery Knight Building 317","extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"166866","name":"MS Proposal"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}