2026-09-18T18:54:29Zhttps://dspace.mit.edu/server/oai/request

oai:dspace.mit.edu:1721.1/704242022-01-13T07:54:36Zcom_1721.1_7582com_1721.1_7581col_1721.1_131022

Ahmed F. Ghoniem. Schlegel, Fabrice Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering 2012-04-26T18:52:10Z 2012-04-26T18:52:10Z 2012 2012 http://hdl.handle.net/1721.1/70424 785196303 Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012. Cataloged from PDF version of thesis. Includes bibliographical references (p. 171-177). Research in advanced combustion modeling is critical to developing control strategies for optimized propulsion systems, especially with regard to stability, emissions, and power density. Examining combustion dynamics and control using numerical simulations, however, presents several challenges, given the multiscale and multiphysics nature of the underlying flows. This thesis presents progresses in combustion modeling for the numerical simulation of turbulent reactive jet flows through the design of a hybrid Eulerian/Lagrangian and massively parallel 3D numerical simulation tool. The adaptivity of the resulting software yields truly fast and accurate simulations, and a better understanding of the simulated combustion processes. The transverse jet vorticity dynamics at high Reynolds numbers are first described, and more specifically the unsteady interactions between the wall boundary layer and the jet. We then present actuation strategies that manipulate the jet penetration and spread via simple nozzle-edge perturbations. Finally, the adaptive Eulerian/Lagrangian code is used to provide a detailed understanding of flame anchoring mechanisms in transverse reactive jets. by Fabrice Schlegel. Ph.D. 182 p. eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Mechanical Engineering. Hybrid Eulerian/Lagrangian 3D methods for high Reynolds number reactive flows Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="dd7156b6-63f0-4656-b0fb-b1f2d330c94e"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Hybrid Eulerian/Lagrangian 3D methods for high Reynolds number reactive flows</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2012</PublicationDate> <Authors> <Author> <DisplayName>Schlegel, Fabrice</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Mechanical Engineering.</Keyword> <Abstract>Research in advanced combustion modeling is critical to developing control strategies for optimized propulsion systems, especially with regard to stability, emissions, and power density. Examining combustion dynamics and control using numerical simulations, however, presents several challenges, given the multiscale and multiphysics nature of the underlying flows. This thesis presents progresses in combustion modeling for the numerical simulation of turbulent reactive jet flows through the design of a hybrid Eulerian/Lagrangian and massively parallel 3D numerical simulation tool. The adaptivity of the resulting software yields truly fast and accurate simulations, and a better understanding of the simulated combustion processes. The transverse jet vorticity dynamics at high Reynolds numbers are first described, and more specifically the unsteady interactions between the wall boundary layer and the jet. We then present actuation strategies that manipulate the jet penetration and spread via simple nozzle-edge perturbations. Finally, the adaptive Eulerian/Lagrangian code is used to provide a detailed understanding of flame anchoring mechanisms in transverse reactive jets.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>