Vortex shedding from a circular cylinder in shear-thinning Carreau fluids

Results from numerical simulations of two-dimensional, shear-thinning Carreau fluid flow over an unconfined circular cylinder are presented in this paper. Parametric sweeps are performed over the various Carreau model parameters, and trends of the time-averaged force coefficients and vortex characte...

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Bibliographic Details
Published inPhysics of fluids (1994) Vol. 31; no. 1
Main Authors Bailoor, Shantanu, Seo, Jung-Hee, Mittal, Rajat
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.01.2019
Subjects
Circular cylinders
Computational fluid dynamics
Computer simulation
Fluid dynamics
Fluid flow
Mathematical models
Physics
Program verification (computers)
Shear
Thinning
Two dimensional flow
Viscosity
Vortex shedding
Vortices
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Summary:Results from numerical simulations of two-dimensional, shear-thinning Carreau fluid flow over an unconfined circular cylinder are presented in this paper. Parametric sweeps are performed over the various Carreau model parameters, and trends of the time-averaged force coefficients and vortex characteristics are reported. In general, increased shear-thinning results in lower viscous forces on the body but greater pressure forces, resulting in a complex non-monotonic drag response. Lift forces generally increased with shear-thinning due to the dominant pressure contribution. The decrease in fluid viscosity also led to shorter vortex formation lengths and the consequent rise in the Strouhal frequency of vortex shedding. It is expected that these results will be useful for verification of computational models of unsteady non-Newtonian flows.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.5086032