Large-eddy simulation of transition in wall-bounded flow
| Autor: | Schlatter, P., Stolz, S., Kleiser, L. |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
ラージエディシミュレーション
圧縮性流れ turbulent flow 境界層遷移 Tollmien-Schlichting wave トルミーン-シュリヒティング波 shear flow laminar-turbulent transition 遷移流 せん断流 turbulence ヘアピン渦 large eddy simulation channel flow 乱流場 hairpin vortice Physics::Fluid Dynamics チャネル流 乱流 層流-乱流遷移 boundary layer transition compressible flow transition flow |
| Zdroj: | 宇宙航空研究開発機構特別資料: 境界層遷移の解明と制御研究会講演論文集 第40回 = JAXA Special Publication: Proceedings of the 40th JAXA Workshop on Investigation and Control of Boundary-Layer Transition. :13-16 |
| ISSN: | 1349-113X |
| Popis: | Laminar-turbulent transition is a crucial phenomenon appearing in a variety of industrial applications. However the involved physical mechanisms as well as methods for reliable and accurate prediction of transition are still a matter of active research. In the present contribution, we give a brief overview on recent advances in the simulation and prediction of transitional and turbulent wall-bounded shear flows. The focus is on Large-Eddy Simulations (LES), which differ from Direct Numerical Simulations (DNS) by resolving only the large-scale, energy-carrying vortices of the fluid flow, whereas the fine-scale fluid oscillations, assumed to be more homogeneous, are treated by a SubGrid-Scale (SGS) model. The application of LES to flows of technical interest is promising and LES is getting more and more applied to practical problems. The main reason for this is that LES provides an increased accuracy compared to solutions of the (statistical) Reynolds-Averaged Navier-Stokes equations (RANS), while requiring only a fraction of the computational cost of a corresponding fully-resolved DNS. Nevertheless, LES of practical transitional and turbulent flows still require massive computational resources and the use of large-scale computer facilities. 資料番号: AA0063908005 レポート番号: JAXA-SP-07-026E |
| Databáze: | OpenAIRE |
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