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Hybrid RANS-LES simulations of F-16XL aircraft in low-speed high-alpha flight
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
2015 (English)In: 33rd AIAA Applied Aerodynamics Conference, American Institute of Aeronautics and Astronautics, 2015Conference paper (Refereed)Text
Abstract [en]

This article presents the comparisons of the results of the CFD study around the F-16XL CAWAPI configuration for flight condition FC25: M∞ = 0:24, α = 19:8°, β = 0°, Re = 32:2M. Previous work has established this case of high angle of attack flight as an outlier in the sense that the computed pressure distributions compared less favorably with those measured in flight tests than did similar comparisons for cases at lower angle of attack. One reason suggested for the discrepancy was that the flow over the outer wing panel was unsteady, possibly including vortex breakdown. This paper presents results computed time accurately with physical modeling that can capture such unsteady flow phenomena. The physical modeling employed is an innovative hybrid RANS-LES model termed HYB0. The simulations obtained are compared with those measured during flight testing of the vehicle as well as with results computed with RANS and URANS physical modeling. Although differences are found among all the results compared, they are not exceeding large. Further analysis of the results are presented, and conclusions are drawn.

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2015.
Keyword [en]
Aerodynamics, Angle of attack, Angle of attack indicators, Computational fluid dynamics, Fighter aircraft, Flight simulators, Navier Stokes equations, Research aircraft, F-16XL aircraft, Flight conditions, High angle of attack, Hybrid RANS-LES, In-flight tests, Physical model, Unsteady flow phenomenon, Vortex breakdown, Supersonic aircraft
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-187532ScopusID: 2-s2.0-84962510094ISBN: 9781624103636OAI: diva2:937020
33rd AIAA Applied Aerodynamics Conference, 2015, 22 June 2015 through 26 June 2015

QC 20160614

Available from: 2016-06-14 Created: 2016-05-25 Last updated: 2016-06-14Bibliographically approved

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Rizzi, Arthur
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