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dc.contributor.authorDuBois, Jacqueline
dc.date.accessioned2008-04-22T08:31:32Z
dc.date.available2008-04-22T08:31:32Z
dc.date.issued1999-12
dc.identifier.citationJ DuBois, Evaluation of a Large Eddy Simulation's Applicability to a Worst Case Fire Scenario, MSc Thesis, Department of Mechanical Engineering, University of California at Berkeley.en
dc.identifier.urihttp://hdl.handle.net/1842/2154
dc.description.abstractThe applicability of a large eddy simulation to a small scale turbulent flow problem is assessed by comparing modeled results to those recovered from a physical apparatus with the same geometry. The computational domain is that of a rearward facing step with a channel-width to step aspect ratio of2:1. The code utilized is LES-3d, and focus is placed on measuring the discrepancy between the recovered recirculation zone lengths when initial and boundary conditions of the virtual flow and duct are altered. It is found that the modeled results exceed the experimental by a factor of 2. These preliminary results point to the degree to which the user-specified parameters of upstream boundary conditions, inlet length, flow speed, flow profile, and computational domain resolution characterize and affect the simulated flow behavior. LES-3d's treatment of these crucial parameters is tested by performing additional experiments in a constant cross section straight duct with the same dimensions as the inlet to the previously mentioned rearward facing step. After looking into LES-3d's set of assumptions and means of incorporating the user's simulation preferences, a second set of simulations are executed with what are considered the optimal settings to guarantee the greatest degree of convergence between the experimental and modeled results. Findings indicate almost a 25% improvement in the recirculation zone measurements; however, other flow parameters such as the profile and boundary layer thickness are not maintained.This report serves as the computational portion of an ongoing study aimed at engineering a bench-scale apparatus to test the effectiveness of non-halogenated fire suppression agents in aircraft engines. The work is performed in cooperation with the National Institute of Standards and Technology, Gaithersburg, MD and the University of Maryland, College Park, MD.en
dc.contributor.sponsorNational Institute of Standards and Technology (NIST)en
dc.format.extent5066744 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherUniversity of California at Berkeleyen
dc.subjectFire safety engineeringen
dc.subjectEngineeringen
dc.subjectturbulent flowen
dc.subjectre-circulationen
dc.subjectlarge eddy simulationen
dc.subjectexperimentsLES-3Den
dc.titleEvaluation of a Large Eddy Simulation's Applicability to a Worst Case Fire Scenarioen
dc.typeTechnical Reporten


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