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Unsteady flows of a viscoplastic medium in channels

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Abstract

We numerically study the nonstationary Poiseuille problem for a Bingham-Il’yushin viscoplastic medium in ducts of various cross-sections. The medium acceleration and deceleration problems are solved by using the Duvaut-Lions variational setting and the finite-difference scheme proposed by the authors. The dependence of the stopping time on internal parameters such as density, viscosity, yield stress, and the cross-section geometry is studied. The obtained results are in good agreement with the well-known theoretical estimates of the stopping time. The numerical solution revealed a peculiar characteristic of the stagnant zone location, which is specific to unsteady flows. In the annulus, disk, and square, the stagnant zones arising shortly before the flow cessation surround the entire boundary contour; but for other domains, the stagnant zones go outside the critical curves surrounding the stagnant zones in the steady flow. The steady and unsteady flows are studied in some domains of complicated shape.

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Authors and Affiliations

  1. Lomonosov Moscow State University, GSP-2, Leninskie Gory, Moscow, 119992, Russia

    E. A. Muravleva & L. V. Muravleva

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  1. E. A. Muravleva
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  2. L. V. Muravleva
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Correspondence to E. A. Muravleva.

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Original Russian Text © E.A. Muravleva, L.V. Muravleva, 2009, published in Izvestiya Akademii Nauk. Mekhanika Tverdogo Tela, 2009, No. 5, pp. 164–188.

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Muravleva, E.A., Muravleva, L.V. Unsteady flows of a viscoplastic medium in channels. Mech. Solids 44, 792–812 (2009). https://doi.org/10.3103/S0025654409050173

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