Anselmo Soeiro Pereira

Anselmo Soeiro Pereira
MINES ParisTech | ParisTech · Centre de mise en forme des matériaux (CEMEF)

PhD

About

29
Publications
5,136
Reads
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449
Citations
Introduction
As a Rheologist/Soft Matter Scientist, I currently work on a variety of challenging topics in Fluid Mechanics, such as: multiphase flows and interfacial problems; elastic and elasto-inertial turbulence; turbulent drag reduction induced by polymers; and on behaviour of non-Newtonian materials. These researches are conducted from theoretical, experimental and numerical standpoints. Feel free to take a look at my scientific publications, experiment/simulation images and videos available in my website (https://anselmopereira.net/).
Additional affiliations
December 2016 - present
MINES ParisTech
Position
  • Fellow
Description
  • Rheology of dense suspension jets
September 2013 - September 2016
Laboratoire de Mécanique de Lille (LML) - Université de Lille 1 - Sciences et Technologies
Position
  • Teaching Assistant (vacataire)
Description
  • B.Sc. courses: “Fundamentals of Fluid Mechanics” (Mécanique des Fluides) and “Numerical Methods in Fluid Mechanics” (Mécanique des Fluides Numérique).
September 2012 - December 2016
Polytech Lille
Position
  • PhD Student
Description
  • Transient aspects of the polymer induced drag reduction phenomenon (direct numerical simulation)
Education
December 2016 - December 2018
MINES ParisTech
Field of study
  • Rheology of dense suspension jets
September 2012 - November 2016
Polytech Lille
Field of study
  • École Polytechnique Universitaire de Lille, Université de Lille 1 - Sciences et Technologie
January 2010 - December 2011
Universidade Federal do Espírito Santo
Field of study
  • Mechanical Engineering

Publications

Publications (29)
Preprint
Full-text available
In this work, we extend the analyses devoted to Newtonian viscous fluids previously reported by Ribe [Physical Review E 68, 036305 (2003)], by investigating shear thickening (dilatant) and shear thinning (pseudoplastic) effects on the development of folding instabilities in non-Newtonian viscous sheets of which viscosity is given by a power-law con...
Article
Full-text available
Drag reduction in turbulent flows by the addition of polymers is a phenomenon that has a variety of applications in the engineering. The highly nonlinear interactions between the turbulent flow and the polymers in the polymeric solution still impose challenges to the understanding of this phenomenon. Efforts to address this problem come mainly from...
Article
Full-text available
We analyse through numerical simulations, experiments, and scaling laws the dam-break problem for viscoplastic materials. Numerically, both two and three-dimensional (2D and 3D) scenarios are considered thanks to a proposed adaptive stabilized finite element framework able to compute efficiently free surface flows of highly viscoplastic materials....
Article
Full-text available
In this note, we investigate through scaling laws and direct numerical simulations the development of inertia-dominated coiling instabilities in power-law fluids. Our numerical results are based on an adaptive variational multi-scale method for mul-tiphase flows. In short, when inertia is balanced by viscous forces in the coil, both the coiling fre...
Preprint
Recent experiments indicated that polymers can reduce the turbulent drag beyond the asymptotic limit known as the MDR, leading to a laminar flow. In this Letter, we show through direct numerical simulations that, when the MDR is exceeded, the flow can remain in a laminar-like regime for a very long period without being truly laminar. During this pe...
Article
Full-text available
The transition from laminar to turbulent flows has challenged the scientific community since the seminal work of Reynolds ( Phil. Trans. R. Soc. Lond. A, vol. 174, 1883, pp. 935–982). Recently, experimental and numerical investigations on this matter have demonstrated that the spatio-temporal dynamics that are associated with transitional flows bel...
Article
Thanks to an adaptive variational multi-scale method for multiphase flows with surface tension, we investigate through direct numerical simulations and scaling laws the buckling of filaments of power-law fluids compressed at a constant velocity by two parallel pistons. Under low gravity (the Laplace pressure exceeds the hydrostatic pressure) and in...
Article
Full-text available
The drag reduction by addition of high molecular additives has been investigated by a number of researchers since it was reported by Toms more than 60 years ago. One of the most significant limitations in drag reduction is the polymer degradation, which is caused by the turbulent structures. Researches have demonstrated that many parameters affect...
Article
Full-text available
Mechanical molecular scission is the main problem of polymeric drag reducers. The ability to reduce the drag is notably decreased as the molecules break down step by step as time goes on. A number of researchers have given a large part of their time to attempts to further understand the role that some important features play in polymer degradation....
Article
Full-text available
In the present paper, we investigate the polymer–turbulence interaction by discriminating between the mechanical responses of this system to three different subdomains: elliptical, parabolic, and hyperbolic, corresponding to regions where the magnitude of vorticity is greater than, equal to, or less than the magnitude of the rate of strain, respect...
Article
Full-text available
In this paper we analyze the active and hibernating turbulence in drag-reducing plane Couette flows using direct numerical simulations of the viscoelastic finitely extensible nonlinear elastic model with the Peterlin approximation fluids. The polymer-turbulence interactions are studied from an energetic standpoint for a range of Weissenberg numbers...
Article
Full-text available
The polymer coil–stretch mechanism in turbulent drag reducing flows is analysed using direct numerical simulations of viscoelastic finitely extensible nonlinear elastic fluids with the Peterlin approximation. The study is carried out taking into account low and high drag reduction regimes. The polymer stretching and the alignment between the confor...
Article
The addition of a small amount of polymers of high molecular weight can lead to a decrease in the pressure drop in turbulent flows. Over the years, numerous studies have been conducted in attempts to make practical use of polymer-induced drag reduction. However, many aspects concerning its main mechanism are still unclear. One of those aspects is t...
Article
Flexible and rigid long chain polymers in very dilute solutions can significantly reduce the drag in turbulent flows. The polymers successively stretch and coil by interacting with the turbulent structures, which changes the turbulent flow and further imposes a transient behavior on the drag reduction as well as a subsequent mechanical polymer degr...
Article
Full-text available
Four classic criteria used to the classification of complex flows are discussed here. These criteria are useful to identify regions of the flow related to shear, elongation or rigid-body motion. These usual criteria, namely $Q$, $\Delta$, $\lambda_{2}$ and $\lambda_{cr}/\lambda_{ci}$, use the fluid's rate-of-rotation tensor, which is known to vary...
Article
This paper studies the loss of efficiency of polymericdrag reducers induced by high Reynolds numberflows in tubes. The overall pressure was fixed and the apparatus was built so as to minimize the polymer degradation. We used three kinds of polymers: two flexible and one rigid. We conducted our tests to take into account the drag reduction (DR) for...
Chapter
Full-text available
Turbulent flows present several compact and spatially coherent regions generically known as coherent structures. The understanding of these structures is closely related to the concept of vortex, whose definition is still a subject of controversy within the scientific community. In particular, the role of objectivity in the definition of vortex rem...
Chapter
Full-text available
In the present work, direct numerical simulations of turbulent channel flow of a viscoelastic FENE-P fluid, at zero-shear friction Reynolds number equal to 180, are used to analyse the polymer extension mechanism. As a primary focus, the relative polymer stretch and the probability distribution function of the alignment between the conformation ten...
Article
Full-text available
La dilution en très faible concentration de chaînes polymériques longues dans un fluide newtonien peut réduire considérablement la traînée turbulente. Ce phénomène remarquable focalise l’attention en raison de ses nombreuses applications pratiques. Dans le présent travail, des simulations numériques directes d’écoulements newtoniens et viscoélastiq...
Article
In this note we present some results concerning the time required for turbulent structures to achieve their steady state, called here the developing time. Notably, there is a drag increase at the very start of the test. Such a drag increase is strongly dependent on the concentration, molecular weight, temperature, Reynolds number, and molecule conf...
Conference Paper
Full-text available
Turbulent flows present several compact and instantaneously coherent regions generically known as coherent structures. It is known that the dilution of an elastic polymer in a Newtonian solvent increases the size of such structures. The understanding of these structures is closely related to the concept of vortex, whose definition is still the subj...
Article
Polymer-induced drag reducing flow has been investigated for over 60 years. One reason for this is that the drag reducers in flow systems have been successfully applied and represent a great potential benefit to many industrial processes. However, the phenomenon is not completely understood and many aspects of the problem remain unclear. Some impor...
Article
The drag reduction by high molecular weight polymer additives in a turbulent flow is an important phenomenon that has received the attention of a number of researchers. However, the efficiency of those additives is not constant. Turbulence is also responsible for breaking the polymer molecules, decreasing their ability to reduce drag. This degradat...

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Projects

Projects (2)
Project
The Post-Graduate Program in Mechanical Engineering (PPGEM/UFES) under the auspices of the Brazilian Society of Mechanical Sciences (ABCM) invites you to participate in the 6th Multiphase Flow Journeys, JEM 2021, that will be held virtually in Vitória – Espírito Santo on May 17-20, 2021. The aim is to bring together two-days of training - composed of lectures on several topics related to multiphase flows -, and two-days of seminars for knowledge upgrading by exchanging experiences between the academy, research institutes and industry, in strategic multiphase sciences such as measurements and instrumentation, multiphase flows with phase change, two-fluid flows, multiphase CFD and modeling, industrial multiphase systems and technologies, and wet and dry particulate systems. All together for scientific and technological development of Brazil. The local organizing committee welcomes the submission of original contributions from students and researchers from academy and industry for oral and poster presentations.