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Computational Analysis of the External Aerodynamics of the Unpowered X-57 Mod-III AircraftInvestigations of the external aerodynamics of the unpowered X-57 Mod-III configuration using computational fluid dynamics are presented. Two different Reynolds-averaged Navier-Stokes flow solvers were used in the analysis: the STAR-CCM+ unstructured solver using polyhedral grid topology, and the Launch Ascent Vehicle Aerodynamics (LAVA) structured curvilinear flow solver using structured overset grid topology. A grid refinement study was conducted and suitable grid resolution was determined by examining the forces and moments of the aircraft. Code-to-code comparison shows that STAR-CCM+ and LAVA are in good agreement both in quantitative values and trends. The angle-of-attack sweep and sideslip-angle sweep were performed. Results indicate that lift coefficients have a sharp drop at stall. At high angle of attack, STAR-CCM+ and LAVA show different flow separation behavior possibly due to differences in the turbulence model. The sideslip-angle sweep results show constant pitching moment from 0° to 15°, then a sharp increase between 15° and 20° sideslip angle.
Document ID
Acquisition Source
Armstrong Flight Research Center
Document Type
Conference Paper
Yoo, Seung Y.
(NASA Armstrong Flight Research Center Edwards, CA, United States)
Duensing, Jared C.
(Science and Technology Corp. Moffett Field, CA, United States)
Date Acquired
June 19, 2019
Publication Date
June 17, 2019
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
Meeting Information
Meeting: AIAA Aviation Forum 2019
Location: Dallas, TX
Country: United States
Start Date: June 17, 2019
End Date: June 21, 2019
Sponsors: American Institute of Aeronautics and Astronautics (AIAA)
Funding Number(s)
Distribution Limits
Public Use Permitted.
Technical Review
NASA Peer Committee
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