DOWNSTREAM INSTABILITY OF VISCOELASTIC FLOW PAST A CYLINDER
KAMAL, H., NAJI, H., THAIS, L., MOMPEAN, G. (2007). DOWNSTREAM INSTABILITY OF VISCOELASTIC FLOW PAST A CYLINDER. EKB Journal Management System, 12(ASAT Conference, 29-31 May 2007), 1-9. doi: 10.21608/asat.2007.23881
H. KAMAL; H. NAJI; L. THAIS; G. MOMPEAN. "DOWNSTREAM INSTABILITY OF VISCOELASTIC FLOW PAST A CYLINDER". EKB Journal Management System, 12, ASAT Conference, 29-31 May 2007, 2007, 1-9. doi: 10.21608/asat.2007.23881
KAMAL, H., NAJI, H., THAIS, L., MOMPEAN, G. (2007). 'DOWNSTREAM INSTABILITY OF VISCOELASTIC FLOW PAST A CYLINDER', EKB Journal Management System, 12(ASAT Conference, 29-31 May 2007), pp. 1-9. doi: 10.21608/asat.2007.23881
KAMAL, H., NAJI, H., THAIS, L., MOMPEAN, G. DOWNSTREAM INSTABILITY OF VISCOELASTIC FLOW PAST A CYLINDER. EKB Journal Management System, 2007; 12(ASAT Conference, 29-31 May 2007): 1-9. doi: 10.21608/asat.2007.23881

DOWNSTREAM INSTABILITY OF VISCOELASTIC FLOW PAST A CYLINDER

International Conference on Aerospace Sciences and Aviation Technology
Article 16, Volume 12, ASAT Conference, 29-31 May 2007, May 2007, Page 1-9  XML PDF (181.88 K)
Document Type: Original Article
DOI: 10.21608/asat.2007.23881
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Authors
H. KAMAL1, 2; H. NAJI3; L. THAIS3; G. MOMPEAN4
1Egyptian Armed Forces+
2Laboratoire de Mécanique de Lille, UMR-CNRS 8107 Université des Sciences et Technologies de Lille, Polytech’Lille - Cité Scientifique, 59655 Villeneuve d’Ascq Cedex, France
3Laboratoire de Mécanique de Lille, UMR-CNRS 8107 Université des Sciences et Technologies de Lille, Polytech’Lille - Cité Scientifique, 59655 Villeneuve d’Ascq Cedex, France.
4Laboratoire de Mécanique de Lille, UMR-CNRS 8107 Université des Sciences et Technologies de Lille, Polytech’Lille - Cité Scientifique, 59655 Villeneuve d’Ascq Cedex, France..
Abstract
This work aims at simulating two-dimensional viscoelastic incompressible fluid flow past a non-confined cylinder. The finite volume method is used to descritize the governing equations written in the generalized orthogonal coordinate system. For the viscoelastic constitutive equation, two models are studied; the Oldryod-B model and the Phan-Thien-Tanner model PTT model. The quadratic scheme QUICK is employed to evaluate the convection terms. The terms of diffusion, advection and
acceleration are treated explicitly. The Elastic Viscous Split Stresses (EVSS) scheme is used to decompose the stress tensor to enhance the stability of computations. The obtained results indicate that, for Newtonian flow, the onset of von Karman street occurs at Reynolds number Re ≥ 47. Upon the onset of vortex shedding the downstream instability zone is elongated and the shedding frequency is reduced. The PTT model proves more stability of computations and reached higher Deborah numbers.
Keywords
Viscoelastic Fluids; Generalized Orthogonal Coordinates; Flow past a Cylinder
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