Skip to main content
×
Home
    • Aa
    • Aa

First instability of the flow of shear-thinning and shear-thickening fluids past a circular cylinder

  • Iman Lashgari (a1), Jan O. Pralits (a2) (a3), Flavio Giannetti (a2) and Luca Brandt (a1)
Abstract
Abstract

The first bifurcation and the instability mechanisms of shear-thinning and shear-thickening fluids flowing past a circular cylinder are studied using linear theory and numerical simulations. Structural sensitivity analysis based on the idea of a ‘wavemaker’ is performed to identify the core of the instability. The shear-dependent viscosity is modelled by the Carreau model where the rheological parameters, i.e. the power-index and the material time constant, are chosen in the range and . We show how shear-thinning/shear-thickening effects destabilize/stabilize the flow dramatically when scaling the problem with the reference zero-shear-rate viscosity. These variations are explained by modifications of the steady base flow due to the shear-dependent viscosity; the instability mechanisms are only slightly changed. The characteristics of the base flow, drag coefficient and size of recirculation bubble are presented to assess shear-thinning effects. We demonstrate that at critical conditions the local Reynolds number in the core of the instability is around 50 as for Newtonian fluids. The perturbation kinetic energy budget is also considered to examine the physical mechanism of the instability.

Copyright
Corresponding author
Email address for correspondence: luca@mech.kth.se
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

1. F. Alizard , J.-C. Robinet & U. Rist 2010 Sensitivity analysis of a streamwise corner flow. Phys. Fluids 22 (1), 014103.

2. D. Barkley & R. D. Henderson 1996 Three-dimensional Floquet stability analysis of the wake of a circular cylinder. J. Fluid Mech. 322, 215241.

4. A. Bottaro , P. Corbett & P. Luchini 2003 The effect of base flow variation on flow stability. J. Fluid Mech. 476, 293302.

5. L. Brandt , D. Sipp , J. O. Pralits & O. Marquet 2011 Effect of base-flow variation on non-modal stability. J. Fluid Mech. 687, 503528.

6. S. Camarri & F. Giannetti 2007 On the inversion of the von Karman street in the wake of a confined square cylinder. J. Fluid Mech. 574, 169178.

7. S. Camarri & F. Giannetti 2010 Effect of confinement on three-dimensional stability in the wake of a circular cylinder. J. Fluid Mech. 642, 477487.

8. F. Caton 2006 Linear stability of circular Couette flow of inelastic viscoplastic fluids. J. Non-Newtonian Fluid Mech. 134, 148154.

9. J.-M. Chomaz 2005 Global instabilities in spatially developing flows: non-normality and nonlinearity. Annu. Rev. Fluid Mech. 37, 357392.

10. P. M. Coelho & F. T. Pinho 2003a Vortex shedding in cylinder flow of shear-thinning fluids. I identification and demarcation of flow regimes. J. Non-Newtonian Fluid Mech. 110, 143176.

10. P. M. Coelho & F. T. Pinho 2003a Vortex shedding in cylinder flow of shear-thinning fluids. I identification and demarcation of flow regimes. J. Non-Newtonian Fluid Mech. 110, 143176.

12. P. M. Coelho & F. T. Pinho 2004 Vortex shedding in cylinder flow of shear-thinning fluids. III pressure measurements. J. Non-Newtonian Fluid Mech. 121, 5568.

13. P. F. Fischer & E. M. Rønquist 1994 Spectral element methods for large scale parallel Navier–Stokes calculations. Comput. Meth. Appl. Mech. Engng 116, 6976.

14. F. Giannetti & P. Luchini 2007 Structural sensitivity of the first instability of the cylinder wake. J. Fluid Mech. 581, 167197.

16. O. Marquet , M. Lombardi , J.-M. Chomaz , D. Sipp & L. Jacquin 2009 Direct and adjoint global modes of a recirculation bubble: lift-up and convective non-normalities. J. Fluid Mech. 622, 121.

17. O. Marquet , D. Sipp & L. Jacquin 2008 Sensitivity analysis and passive control of cylinder flow. J. Fluid Mech. 615, 221252.

18. P. Meliga , D. Sipp & J.-M. Chomaz 2010a Effect of compressibility on the global stability of axisymmetric wake flows. J. Fluid Mech. 660, 499526.

19. P. Meliga , D. Sipp & J.-M. Chomaz 2010b Open-loop control of compressible afterbody flows using adjoint methods. Phys. Fluids 22 (5), 054109.

20. S. Milleta , F. Rousset & V. B. H. B. Hadid 2009 Stability analysis of stratified coating flow of shear-thinning fluids. Eur. Phys. J. Special Topics 166, 143146.

21. S. Mossaz , P. Jay & A. Magnin 2010 Criteria for the appearance of recirculating and non-stationary regimes behind a cylinder in a viscoplastic fluid. J. Non-Newtonian Fluid Mech. 165, 15251535.

22. A. Nejat , V. Abdollahi & K. Vahidkhah 2011 Lattice Boltzmann simulation of non-Newtonian flows past confined cylinders. J. Non-Newtonian Fluid Mech. 166, 689697.

23. C. Nouar , A. Bottaro & J. P. Brancher 2007 Delaying transition to turbulence in channel flow: revisiting the stability of shear-thinning fluids. J. Fluid Mech. 592, 177194.

24. C. Nouar & I. Frigaard 2009 Stability of plane Couette-Poiseuille flow of shear-thinning fluid. Phys. Fluids 21, 064104.

25. S. K. Panda & R. Chhabra 2010 Laminar flow of power-law fluids past a rotating cylinder. J. Non-Newtonian Fluid 165, 14421461.

26. A. T. Patera 1984 A spectral element method for fluid dynamics: laminar flow in a channel expansion. J. Comput. Phys. 54, 468488.

27. V. K. Patnana , R. P. Bharti & R. P. Chhabra 2009 Two-dimensional unsteady flow of power-law fluids over a cylinder. Chem. Engng Sci. 64, 29782999.

28. C. J. Pipe & P. A. Monkewitz 2006 Vortex shedding in flows of dilute polymer solutions. J. Non-Newtonian Fluid Mech. 139, 5467.

30. M. Provansal , C. Mathis & L. Boyer 1987 Bénard-von Kármán instability: transient and forced regimes. J. Fluid Mech. 182, 122.

31. D. Richter , G. Iaccarino & E. S. G. Shaqfeh 2010 Simulations of three-dimensional viscoelastic flows past a circular cylinder at moderate Reynolds numbers. J. Fluid. Mech. 651, 415442.

32. D. Richter , E. S. G. Shaqfeh & G. Iaccarino 2011 Floquet stability analysis of viscoelastic flow over a cylinder. J. Non-Newtonian Fluid Mech. 166, 554565.

33. T. Sarpkaya , P. G. Rainey & R. E. Kell 1973 Flow of dilute polymer solution about circular cylinder. J. Fluid Mech. 57, 177208.

34. D. Sipp , O. Marquet , P. Meliga & A. Barbagallo 2010 Dynamics and control of global instabilities in open flows: a linearized approach. Appl. Mech. Rev. 63, 030801.

35. P. Sivakumar , R. P. Bharti & R. Chhabra 2006 Effect of power-law index on critical parameters for power-law flow across an unconfined circular cylinder. Chem. Engng Sci. 61, 60356046.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×
MathJax

Keywords:

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 52 *
Loading metrics...

Abstract views

Total abstract views: 112 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 20th August 2017. This data will be updated every 24 hours.