Accurate physical and numerical modeling of complex vortex phenomena over delta wings
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
With this contribution to the AVT-113/VFE-2 task group it was possible to prove the feasibility of high Reynolds number CFD computations to resolve and thus better understand the peculiar dual vortex system encountered on the VFE-2 blunt leading edge delta wing. Initial investigations into this phenomenon seemed to undermine the hypothesis, that the formation of the inner vortex system relies on the laminar state of the boundary layer at separation onset. As a result of this research, this initial hypothesis had to be expanded to account also for high Reynolds number cases, where a laminar boundary layer status at separation onset could be excluded. Furthermore, the data published in the same context shows evidence of secondary separation under the inner primary vortex. This further supports the supposition of a diﬀerent generation mechanism of the inner vortical system other than a pure development out of a possibly laminar separation bubble. The unsteady computations performed on numerical grids with different levels of reﬁnement led furthermore to the establishment of internal guidelines speciﬁc to the DES approach.
Place, publisher, year, edition, pages
Stockholm: KTH , 2006. , v, 19 p.
Trita-AVE, ISSN 1651-7660 ; 2006:82
computational fluid dynamics, CFD, vortical flow, delta wing, aerodynamics, flow physics, steady, unsteady
IdentifiersURN: urn:nbn:se:kth:diva-4164OAI: oai:DiVA.org:kth-4164DiVA: diva2:11006
2006-11-27, Seminarierum S40, AVE, Teknikringen 8, Stockholm, 13:00
Wallin, Stefan, Dr.
QC 201011112006-11-072006-11-072010-11-11Bibliographically approved
List of papers