Title: Separated Flow Past An Airfoil at High Angle of Attack: LES Predictions and Analysis
Authors: Jovicic, Nikola
Breuer, Michael 
Language: eng
Subject (DDC): 000 Informatik, Information & Wissen, allgemeine Werke
500 Naturwissenschaften
600 Technik
Issue Date: 2004
Publisher: Springer
Document Type: Book Part
Source: Jovičić, N., Breuer, M. (2004). Separated Flow Past an Airfoil at High Angle of Attack: LES Predictions and Analysis. In: Friedrich, R., Geurts, B.J., Métais, O. (eds) Direct and Large-Eddy Simulation V. ERCOFTAC Series, vol 9. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-2313-2_64
Journal / Series / Working Paper (HSU): ERCOFTAC Series
Volume: 9
Page Start: 611
Page End: 618
Published in (Book): Direct and Large-Eddy Simulation V
Publisher Place: Dordrecht
Conference: Fifth International ERCOFTAC Workshop on DNS and LES: DLES-5, Munich University of Technology, Germany, Aug. 27–29, 2003
The objective of this study is the prediction and analysis of the turbulent flow past an unswept wing at high angle of attack. The LES predictions were based on two different subgrid-scale models (Smagorinsky and Dynamic). The Reynolds number (Rec= 105) and the angle of attack ($\alpha$ = 18{\textdegree}) were chosen such that the flow exhibits a trailing-edge separation at the lowest Recrealizable within the corresponding experiment COSTWING. At these operating conditions, many interesting flow phenomena appear, e.g., a thin separation bubble, transition, separation, and large-scale vortical structures. Qualitatively the predictions based on both SGS models show the same aforementioned flow features, although some noteworthy differences become evident, e.g., the shape and size of the separation bubble. This has a strong impact on the transition process and thus the succeeding development of the entire flow yielding quantitative deviations regarding Cp, Cfor k. The differences can be attributed to a well-known shortcoming of the Smagorinsky model. In addition, the paper aims at a deeper insight into the nature of turbulent separated flows. For that purpose the LES data were analyzed according to the anisotropy-invariant theory which provides an improved illustration of what happens in a turbulent flow. Therefore, the anisotropy invariants at various locations in the flow were displayed in the invariant map in order to analyze the state of turbulence in distinct regions.
Organization Units (connected with the publication): Strömungsmechanik 
ISBN: 978-90-481-6575-9
Publisher DOI: 10.1007/978-1-4020-2313-2_64
Appears in Collections:6 - Bibliographic Data - Publications of the HSU Researchers (before HSU)

Show full item record

CORE Recommender

Google ScholarTM




Items in openHSU are protected by copyright, with all rights reserved, unless otherwise indicated.