On creeping flow of a visco-plastic fluid past a circular cylinder

Adachi, Kohsuke; Yoshioka, Naoya

doi:10.1016/0009-2509(73)85102-4

Cited by 55 publications

(37 citation statements)

References 13 publications

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“…It should be mentioned that such a principle has already been used, for instance, by Adachi and Yoshioka [20] for deriving analytical estimates of the drag force exerted by a Bingham fluid flow on a rigid circular obstacle. Denoting by C; the set of velocity fields defined on the current configuration of the soil mass…”

Section: A Minimum Principlementioning

confidence: 98%

Minimum principle and related numerical scheme for simulating initial flow and subsequent propagation of liquefied ground

Montassar¹,

Buhan²

2005

Num Anal Meth Geomechanics

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SUMMARYThe problem of predicting the evolution of liquefied ground, modelled as a viscoplastic material, is addressed by combining a minimum principle for the velocity field, which characterizes such an evolution, and a time step integration procedure. Two different numerical schemes are then presented for the finite element implementation of this minimum principle, namely, the regularization technique and the decomposition-co-ordination method by augmented Lagrangian. The second method, which proves more accurate and efficient than the first, is finally applied to simulate the incipient flow failure and subsequent spreading of a liquefied soil embankment subject to gravity. The strong influence of liquefied soil residual shear strength on reducing the maximum amplitude of the ground displacement is particularly emphasized in such an analysis.

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Section: A Minimum Principlementioning

confidence: 98%

Minimum principle and related numerical scheme for simulating initial flow and subsequent propagation of liquefied ground

Montassar¹,

Buhan²

2005

Num Anal Meth Geomechanics

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“…The CWS used in the experiments considered to collect our data was prepared with a Polish coal according to SP REOCARB process (a Snamprogetti patent) 2 The geometry we considered is that of a rotational bob-cup viscometer (designed on purpose with a widened gap), where the settling of particles is transverse to the direction of shearing (exactly as in the pipeline flow). The viscometer was filled up with CWS in which a population P of sand particles with density ρs > ρCW S has been initially homogeneously dispersed.…”

Section: Sedimentation In a Cws Sheared In A Rotating Viscometermentioning

confidence: 99%

“…We do not postulate the existence of a relationship of the type (5) nor enter the debate about the dimension and shape of the unsheared envelope surrounding the particles hypothized by some Authors (see [4], [2][6] and [14] for a review on this topic).…”

Section: Sedimentation In a Cws Sheared In A Rotating Viscometermentioning

confidence: 99%

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Sedimentation in Coal-Water Slurry Pipelining

Rosso

2000

Complex Flows in Industrial Processes

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In this paper we present an overview of recent investigations on the problem of sedimentation related to the pipelining of a Coal-Water Slurry. The main aspects of the problem are both the determination of the sedimentation velocity, and the understanding and modelling of the dynamics of the sedimentation bed which accumulates on the bottom of the pipe. The analysis is carried out using a combination of suggestions dictated by experimental evidence and suitable mathematical techniques. The result is a model which appears to be both easily manageable and flexible. Predictions of the model are compared with experiments finding a remarkable agreement with the available data.

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“…The reported studies to date focus on both unconfined (Adachi and Yoshioka, 1973;Tokpavi et al, 2008;Mossaz et al, 2010Mossaz et al, , 2012Nirmalkar and Chhabra, 2014) and confined geometries (Zisis and Mitsoulis, 2002;Mitsoulis, 2004). The distinct feature of viscoplastic materials is that below a critical value of the shear stress they behave as rigid bodies and form solid-like unyielded regions.…”

Section: Introductionmentioning

confidence: 97%