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Talks and Poster Presentations (with Proceedings-Entry):

B. Scheichl, A. Kluwick:
"Turbulent Separation from a Bluff Body: the Trailing-Edge Case";
Talk: 23rd International Congress of Theoretical and Applied Mechanics (ICTAM 2012), Beijing, China; 2012-08-19 - 2012-08-24; in: "ICTAM 2012 / Abstract Book", IUTAM, Beijing (2012), ISBN: 978-988-16022-3-7; Paper ID FM02-005, 2 pages.



English abstract:
An asymptotic theory developed recently of incompressible two-dimensional time-mean turbulent boundary layer flow past the smooth impervious surface of a rigid bluff body for large Reynolds numbers is extended insofar as the turbulence intensity level is increased and separation correspondingly delayed. Specifically, it is assumed to occur at a small distance from the rear stagnation point referring to fully attached inviscid potential flow. In contrast to previous studies of this situation, here the external flow is weakly perturbed so that the free streamlines detach smoothly. In turn, we consider a distinguished limit that allows the small streamwise velocity deficit of the incident boundary layer to be gradually transformed into a large one. Most important, the arising flow structure is susceptible to both symmetric separation on either side of the stagnation point and the merge of the free shear layers into a wake flow in a self-consistent manner. The qualitative results of the combined analytical/numerical study are independent of the choice of a specific Reynolds stress model.

Keywords:
bluff-body flows, interacting boundary layers, matched asymptotic expansions, separation, turbulence


Electronic version of the publication:
http://publik.tuwien.ac.at/files/PubDat_206975.pdf


Created from the Publication Database of the Vienna University of Technology.