期刊
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
卷 87, 期 1-5, 页码 232-261出版社
WILEY
DOI: 10.1002/nme.3036
关键词
Discontinuous Galerkin method; Implicit Large Eddy Simulation; transition to turbulence; laminar separation bubble; low Reynolds number
资金
- Air Force Office of Scientific Research under the Multi-University Research Initiative [001425594000]
- Mexico's National Council for Science and Technology (CONACYT)
- National Science Foundation
- Texas Advanced Computing Center
- National Center for Supercomputing Applications
- Louisiana Optical Network Initiative [TG-ASC080034N]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
The present work predicts the formation of laminar separation bubbles at low Reynolds numbers and the related transition to turbulence by means of Implicit Large Eddy Simulations with a high-order Discontinuous Galerkin method. The flow around an SD7003 infinite wing at an angle of attack of 4 degrees is considered at Reynolds numbers of 10 000, 22 000, and 60 000 in order to gain insight into the characteristics of the laminar and turbulent regimes. At the lowest Reynolds number studied, the flow remains laminar and two dimensional over the wing surface, with a periodic vortex shedding. For higher Reynolds numbers, the flow is unsteady over the upper wing surface and exhibits a separation bubble along which the flow transitions to turbulence. Tollmien-Schlichting (TS) waves are observed in the boundary layer, and transition is found to be caused by unstable TS modes as revealed by the growth of the stream-wise amplification factor. Copyright (C) 2010 John Wiley & Sons, Ltd.
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