LES of Converging-Diverging Channel Flow with Separation

• Autorzy: Kuban L. , Elsner W. , Tyliszczak A.
• Języki publikacji: EN

Abstrakty

EN

The paper presents the results of LES simulation of two different turbulent channels with inlet conditions corresponding to the Reynolds number Re =395. In both cases a varying pressure gradient was obtained by an adequate curvature of one of the walls. The first case is treated as a benchmark and is used to validate the numerical procedure. This case is characterized by the same cross-section area at the inlet and outlet and a bump of a smooth profile located on one of the walls designed to be identical to the one used in the experiment conducted at Laboratorie de Mecanique de Lille (LML) (Marquillie et al., 2008). The second case corresponds to the geometry which reproduces the real geometry of the turbomachinery test section of the Czestochowa University of Technology. The test section was created in such a way as to produce the pressure gradient which would correspond to the conditions present in the axial compressor blade channel. The shape of both channels produced initially favorable (FPG) and then adverse pressure gradients (APG), and in this way created conditions for boundary layer separation. Due to a reverse flow where the turbulence transport is dictated by the dynamics of the large-scale eddies such a case is well suited to demonstrate predictive features of the LES technique.

Słowa kluczowe

EN

LES; turbulent boundary layer; separation; channel flow; pressure gradient

• Wydawca: Politechnika Gdańska
• Czasopismo: TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
• Rocznik: 2010
• Tom: Vol. 14, No 3
• Strony: 283--295
• Opis fizyczny: Bibliogr. 12 poz., rys., tab.

Twórcy

autor

Kuban L.

autor

Elsner W.

autor

Tyliszczak A.

• Czestochowa University of Technology, Institute of Thermal Machinery, Al. Armii Krajowej 21, 42-200 Częstochowa, Poland,

Bibliografia

• [1] Meyers J, Geurts B J and Baelmans M 2003 Physics of Fluids 15 (9) 2740
• [2] Meyers J, Geurts B J and Sagaut P J 2007 J. Comp. Physics 227 (1) 156
• [3] Piomelli U, Moin P and Ferziger J 1988 Physics of Fluids 31 1884
• [4] Wu X and Squires K D 1998 J. Fluid Mech. 362 229
• [5] Webster D R, Degraaff D B and Eaton J K 1996 J. Fluid Mech. 320 53
• [6] El-Askary W A 2010 Int. J. Num. Methods, doi: 10.1002/fld.2255
• [7] Marquilli M, Laval J P and Dolganov R 2008 J. Turbulence 9 (1) 1
• [8] Nicoud F and Ducros F 1999 Turbulence and Combustion 62 183
• [9] Fletcher C A J 1991 Computational Techniques for Fluid Dynamics, Springer-Verlag
• [10] Lele S K 1991 J. Comp. Physics 103 16
• [11] Laval J P, Elsner W, Kuban L and Marquillie M 2008 LES Modeling of Converging Diverging Turbulent Channel Flow, Proc. Workshop – Progress in Wall Turbulence: Understanding and Modelling, Lille, France
• [12] Materny-Latos M, Drozdz A, Drobniak S and Elsner W 2008 Arch. Mech. 60 (6) 1