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Criteria for the appearance of recirculating and non-stationary regimes behind a cylinder in a viscoplastic fluid. (English) Zbl 1274.76050
Summary: The appearance of a recirculation zone and the formation of non-stationary vortices behind a cylinder in the unconfined flow of a Herschel-Bulkley fluid have been studied by numerical simulation. The Herschel-Bulkley constitutive equation was regularised by using the Papanastasiou model. Special attention was paid to determining the numerical parameters and comparing them to existing results. The influence of the Oldroyd number and power-law index on flow morphology and, in particular, on the unyielded zones was studied over a wide spectrum (\(0\leq Od\leq 10\)) and (\(0.3\leq n\leq 1.8\)). It was seen that the greater the Oldroyd number, the greater the critical Reynolds numbers and Strouhal number for the two flow regimes. The influence of the power-law index is more complex.

76A05 Non-Newtonian fluids
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