{"648570":{"#nid":"648570","#data":{"type":"event","title":"PhD Defense by Po-Wei Chen","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003EPo-Wei Chen\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cem\u003E(Advisor: Prof. Lakshmi Sankar]\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cem\u003Ewill defend a doctoral thesis entitled\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cem\u003EA PHYSICS-BASED MODEL FOR INFLOW CHARACTERISTICS OF \u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cem\u003EMULTI-ROTOR CONFIGURATIONS\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cem\u003EOn\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EWednesday, August 4 at 9 a.m. \u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Ca href=\u0022https:\/\/bluejeans.com\/550894873\u0022\u003Ehttps:\/\/bluejeans.com\/550894873\u003C\/a\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract\u003C\/strong\u003E\u003Cbr \/\u003E\r\nA physics-based model for modeling helicopter and UAV rotor configurations, previously developed for isolated rotors and coaxial rotors in hover and forward flight has been extended to more general multi-rotor configurations. Simulations for coaxial, and tandem rotor configurations have been done for a number of low and high Reynolds number configurations, and comparisons with test data have been made.\u0026nbsp; The physics behind the rotor interactions has been explored through visualization and analysis of vortex wake trajectories and inflow velocity distributions.\u0026nbsp;\u0026nbsp;\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EAs part of this effort, a fast off-body velocity field analysis that employs GPU processors has been implemented. In addition to computation of inflow velocity field above or below the rotor disks, this approach is capable of rapidly computing and visualizing velocity field on any user specified plane. In many helicopters design studies, the adverse interactions caused by the main rotor wake should be considered in the placement of horizontal and vertical stabilizers, as well as the tail rotors and pusher-propulsors. This capability for rapid calculation and visualization of the off-body flow field would greatly aid the designers in the placement of these components.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EA previously developed algebraic transition model that regulates the magnitude of the production term in the Spalart-Allmaras one-equation turbulence model has been independently implemented in the present solver, and in the commercial CFD solver ANSYS Fluent as a user-defined function. Previous validation of this model was limited to 2-D flow over airfoils in the transitional Reynolds number regime. In the present work, this model has been also validated for large scale rotors in hover.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ECommittee\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cul\u003E\r\n\t\u003Cli\u003EProf. Lakshmi Sankar \u0026ndash; School of Aerospace Engineering (advisor)\u003C\/li\u003E\r\n\t\u003Cli\u003EProf. Jechiel Jagoda \u0026ndash; School of Aerospace Engineering\u003C\/li\u003E\r\n\t\u003Cli\u003EProf. JVR Prasad \u0026ndash; School of Aerospace Engineering\u003C\/li\u003E\r\n\t\u003Cli\u003EProfessor Dan Schrage \u0026ndash; School of Aerospace Engineering\u003C\/li\u003E\r\n\t\u003Cli\u003EDr. Xiaomeng \u0026nbsp;ZHAI \u0026ndash; Lead Software Engineer, Cadence Design Systems Inc., Burlington, MA\u003C\/li\u003E\r\n\u003C\/ul\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"A PHYSICS-BASED MODEL FOR INFLOW CHARACTERISTICS OF  MULTI-ROTOR CONFIGURATIONS"}],"uid":"27707","created_gmt":"2021-07-06 16:11:51","changed_gmt":"2021-07-06 16:11:51","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2021-08-04T10:00:00-04:00","event_time_end":"2021-08-04T12:00:00-04:00","event_time_end_last":"2021-08-04T12:00:00-04:00","gmt_time_start":"2021-08-04 14:00:00","gmt_time_end":"2021-08-04 16:00:00","gmt_time_end_last":"2021-08-04 16:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"100811","name":"Phd Defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78771","name":"Public"},{"id":"174045","name":"Graduate students"},{"id":"78751","name":"Undergraduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}