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Fluids 2016, 1(4), 37; doi:10.3390/fluids1040037

Unconfined Unsteady Laminar Flow of a Power-Law Fluid across a Square Cylinder

School of Engineering, Democritus University of Thrace, 67100 Xanthi, Greece
Academic Editors: Hamid Arastoopour and Mehrdad Massoudi
Received: 29 August 2016 / Revised: 19 October 2016 / Accepted: 14 November 2016 / Published: 18 November 2016
(This article belongs to the Special Issue Computational Fluid Dynamics)
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Abstract

The flow of a non-Newtonian, power-law fluid, directed normally to a horizontal cylinder with square cross-section (two-dimensional flow) is considered in the present paper. The problem is investigated numerically with a very large calculation domain in order that the flow could be considered unconfined. The investigation covers the power-law index from 0.1 up to 2 and the Reynolds number ranges from 60 to 160. Over this range of Reynolds numbers the flow is unsteady. It is found that the drag coefficient and the Strouhal number are higher in a confined flow compared to those of an unconfined flow. In addition some flow characteristics are lost in a confined flow. Complete results for the drag coefficient and Strouhal number in the entire shear-thinning and shear-thickening region have been produced. In shear-thinning fluids chaotic structures exist which diminish at higher values of power-law index. This study represents the first investigation of unsteady, non-Newtonian power-law flow past a square cylinder in an unconfined field. View Full-Text
Keywords: square cylinder; power-law; drag; lift; vortex street square cylinder; power-law; drag; lift; vortex street
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Pantokratoras, A. Unconfined Unsteady Laminar Flow of a Power-Law Fluid across a Square Cylinder. Fluids 2016, 1, 37.

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