Detached-eddy simulation of an airfoil at high angle of attack

Shur, M. L.; Spalart, Philippe R.; Strelets, M. Kh.; Travin, Andrey

doi:10.1016/b978-008043328-8/50064-3

Cited by 360 publications

(197 citation statements)

References 7 publications

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“…= max ( x, y, z), and the constant C DES is taken as 0.65 from a calibration of the model for isotropic turbulence (Shur et al 1999). We have followed the detailed analysis of the numerical treatments indicated by Sagaut et al (2006) and carefully examined the present simulations.…”

Section: Mathematical Formulation and Numerical Methodsmentioning

confidence: 99%

Numerical investigation of the compressible flow past an aerofoil

Chen

2009

J. Fluid Mech.

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Numerical investigation of the compressible flow past an 18% thick circular-arc aerofoil was carried out using detached-eddy simulation for a free-stream Mach number M∞ = 0.76 and a Reynolds number Re = 1.1 × 107. Results have been validated carefully against experimental data. Various fundamental mechanisms dictating the intricate flow phenomena, including moving shock wave behaviours, turbulent boundary layer characteristics, kinematics of coherent structures and dynamical processes in flow evolution, have been studied systematically. A feedback model is developed to predict the self-sustained shock wave motions repeated alternately along the upper and lower surfaces of the aerofoil, which is a key issue associated with the complex flow phenomena. Based on the moving shock wave characteristics, three typical flow regimes are classified as attached boundary layer, moving shock wave/turbulent boundary layer interaction and intermittent boundary layer separation. The turbulent statistical quantities have been analysed in detail, and different behaviours are found in the three flow regimes. Some quantities, e.g. pressure-dilatation correlation and dilatational dissipation, have exhibited that the compressibility effect is enhanced because of the shock wave/boundary layer interaction. Further, the kinematics of coherent vortical structures and the dynamical processes in flow evolution are analysed. The speed of downstream-propagating pressure waves in the separated boundary layer is consistent with the convection speed of the coherent vortical structures. The multi-layer structures of the separated shear layer and the moving shock wave are reasonably captured using the instantaneous Lamb vector divergence and curl, and the underlying dynamical processes are clarified. In addition, the proper orthogonal decomposition analysis of the fluctuating pressure field illustrates that the dominated modes are associated with the moving shock waves and the separated shear layers in the trailing-edge region. The results obtained in this study provide physical insight into the understanding of the mechanisms relevant to this complex flow.

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Section: Mathematical Formulation and Numerical Methodsmentioning

confidence: 99%

Numerical investigation of the compressible flow past an aerofoil

Chen

2009

J. Fluid Mech.

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“…In addition, a promising hybrid RANS/LES approach named Detached Eddy Simulation (DES) [14] will be implemented to improve the solution accuracy for highly separated unsteady flows. Preliminary computations with DES have shown significant improvements in accuracy over RANS [13,15,16]. Therefore, the main advantages of the proposed methodology for moving-body applications are as follows:…”

Section: Discussionmentioning

confidence: 99%

“…These models were calibrated according to turbulent boundary layers. The use of the RANS approach for highly separated flows can cause large errors [13].…”

Section: Discussionmentioning

confidence: 99%

Simulation of Moving Boundary Flow Using Overset Adaptive Cartesian/Prism Grids and DES

Wang¹

2003

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The public reporting burden for this collection of information is estimated to average 1 hour per response, includ gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comr of information, including suggestions for reducing the burden, to Department of Defense, Washington Head (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be a subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OIV, Development of improved weapon systems requires better understanding of the complex aerodynamics created by moving boundaries. Carriage and release of conventional weapons from aircraft and aerial refueling fall in this category. The flow problems involving moving boundaries are very challenging to compute because the resultant flow field is intrinsically unsteady. Modeling such flow problems is made even more difficult due to the complex geometries and the highly turbulent namre of the unsteady flows. Under an exploratory grant from the AEOSR, a new simulation environment for moving boundary problems is being developed. This environment is designed to advance the state-of-the-art for moving boundary flow problems in the following areas: I. Improve the solution accuracy and efficiency through the use of overset adaptive Cartesian/prism grids. Key flow features will be automatically captured with solution based grid adaptations; 2. Improve the accuracy for highly turbulent unsteady separated flows encountered in moving boundary problems with a hybrid RANS/LES (Reynolds Averaged Navier Stokes/Large Eddy Simulation) approach named Detached Eddy Simulation (DES The report documents the research activities carried out since the grant award, and outlines future work. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. AFRL-SR-AR-TR-04- SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENT

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“…para predecir los patrones de flujos de aire y las condiciones ambientales interiores para convección natural, forzada y mixta en cavidades cerradas, y en oficinas y atrios reales. La Tabla 1 resume algunos de esos estudios, los que cubren una amplia gama de modelos de turbulencia, desde modelos simples como el método Ecuación-cero de Chen y Xu (1998) hasta modelos más avanzados como los modelos de simulación de torbellino-separado (detached-eddy simulation models) de (Shur et al 1999). La tabla entrega una evaluación del comportamiento de los diversos modelos de turbulencia para predecir la temperatura y velocidad desde "A" a "D" de acuerdo con la información entregada por los estudios revisados.…”

Section: Evaluación De Los Modelos De Turbulenciaunclassified