Lessons learned from numerical simulations of the F-16XL at flight conditions
2009 (English)In: Journal of Aircraft, ISSN 0021-8669, Vol. 46, no 2, 423-441 p.Article in journal (Refereed) Published
Nine organizations participated in the Cranked-Arrow Wing Aerodynamics Project International study and have contributed steady and unsteady viscous simulations of a full-scale semispan model of the F-16XL aircraft. Three different categories of flight Reynolds/Mach number combinations are computed and compared with flight-test measurements for the purpose of code validation and improved understanding of the flight physics. Steady-state simulations are done with several turbulence models (of different complexity, with no topology information required) that overcome Boussinesq-assumption problems in vortical flows. Detached-eddy simulation and its successor, delayed detached-eddy simulation, are used to compute the time-accurate flow development. Common structured and unstructured grids as well as individually adapted unstructured grids were used. Although discrepancies are observed in the comparisons, overall reasonable agreement is demonstrated for surface pressure distribution, local skin friction, and boundary velocity profiles at subsonic speeds. The physical modeling, be it steady or unsteady flow, and the grid resolution both contribute to the discrepancies observed in the comparisons with flight data, but at this time, how much each part contributes to the whole cannot be determined. Overall, it can be said that the technology readiness of computational fluid dynamics simulation technology for the study of vehicle performance has matured since 2001, such that it can be used today with a reasonable level of confidence for complex configurations.
Place, publisher, year, edition, pages
2009. Vol. 46, no 2, 423-441 p.
Aircraft; Computational fluid dynamics; Flight dynamics; Fluid dynamics; Friction; Gas dynamics; Models; Transonic aerodynamics; Turbulence models; Wings
IdentifiersURN: urn:nbn:se:kth:diva-8481DOI: 10.2514/1.35698ISI: 000264858800007ScopusID: 2-s2.0-63349099579OAI: oai:DiVA.org:kth-8481DiVA: diva2:13816
QC 20100713. Uppdaterad från in press till published (20100713).2008-05-162008-05-162010-07-13Bibliographically approved