# Outi Tammisolas publikationer - KTH

Doctoral students in simulations and experiments with

with interstitial fluids, and may suffer degradation and fracture processes 3 Jan 2019 For this purpose, the elasto-viscoplasticity (EVP) overstress theory is co. for pore fluid drainage and pore pressure equalization (Kolsky 1949; viscoelastic liquids, for approaching the complex behavior of yield stress fluids. M.F. Naccache, P.R.D. Mendes, Flow of elasto-viscoplastic thixotropic liquids Journal of Non-Newtonian Fluid Mechanics journal homepage: www.elsevier.

When the drop is made of a complex fluid the problem presents numerical challenges due to the interaction of the mechanical properties and the free surface approach. In the present work, we solve the numerical problem of elasto-viscoplastic drops colliding in vertical plane. The free To predict the complex transient rheology of thixotropic elasto-viscoplastic (TEVP) fluids, we generalize a previous scalar thixotropic-only “multi-lambda” (ML) model and combine it with the isotropic kinematic hardening (IKH) model. The Herschel–Bulkley rheological fluid model includes terms representing viscosity and plasticity. In this classical model, below the yield stress the material is strictly rigid. Complementing this model by including elastic behavior below the yield stress leads to a description of an elastoviscoplastic (EVP) material such as an emulsion or a liquid foam.

When the elastic effects increase, the elastoviscoplastic ﬂow becomes time- In this work, we solve the full Cauchy equations governing the inertial flows of a viscoplastic fluid (Bingham model) and elastoviscoplastic fluid (Saramito model).

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In the first case the viscous effects manifest themselves only in combination with plastic properties after exceeding of yield A numerical and theoretical study of yield-stress fluid flows in two types of model porous media is presented. We focus on viscoplastic and elastoviscoplastic av E Chaparian · 2020 — Elastoviscoplastic fluid, Particle migration, Viscoelastic fluid, Yield-stress fluid, Yield stress, Buoyant rigid sphere, Elasto-viscoplastic, Elasto-viscoplasticity, E. Chaparian et al., "Yield-stress fluids in porous media : a comparison of viscoplastic and elastoviscoplastic flows," Meccanica (Milano. Print), vol. 55, no.

### Particle migration in channel flow of an elastoviscoplastic fluid

The equation for stress is obtained in accordance with a simple mechanical analog An analytical study of the forced convection of nonlinear elastoviscoplastic fluids in tubes of arbitrary cross section is presented. The constitutive structure of the fluid is described by a frame indifferent linear combination of the Modified Request PDF | Forced Convection of Elastoviscoplastic Fluids in Non-Circular Tubes | An analytical study of the forced convection of an elastoviscoplastic fluid in tubes of arbitrary cross section We present numerical simulations of laminar and turbulent channel flow of an elastoviscoplastic fluid. The non-Newtonian flow is simulated by solving the full incompressible Navier-Stokes equations coupled with the evolution equation for the elastoviscoplastic stress tensor. The laminar simulations are carried out for a wide range of Reynolds numbers, Bingham numbers and ratios of the fluid Some elasto-viscoplastic preliminary results obtained at the Laboratory of Applied and Computational Fluid Mechanics (LAMAC) from the Federal University of R (2020) Chaparian et al. Meccanica. A numerical and theoretical study of yield-stress fluid flows in two types of model porous media is presented. We focus on viscoplastic and elastoviscoplastic flows to reveal some differences and similarities between these two classes of flows.

1 Introduction. Lifetime of Liquid Rocket Engine chambers is
Elastoviscoplastic fluid, Particle migration, Viscoelastic fluid, Yield-stress fluid, Yield stress, Buoyant rigid sphere, Elasto-viscoplastic, Elasto-viscoplasticity,
18 Oct 2019 We propose a numerically stable and computationally efficient elasto-visco- plastic self-consistent (VPSC) crystal plasticity model, where the
The constitutive structure of the EVP fluid obeys a linear combination of the Phan- Thien-Tanner model for viscoelastic fluids and the Bingham model for
26 Oct 2020 L27 Elasto-visco-plastic response: creep, stress relaxation, and L38 Coupled fluid-driven fracture problem: PKN step-by-step solution. 1 Dec 2008 or blood, present such elastoviscoplastic behavior: at low stress, the material Keywords – non-Newtonian fluid; viscoelasticity; viscoplasticity;
Abstract: Complex fluids exhibiting a yield stress have extremely variable shear properties ranging from elasto-plastic behaviour below the yield stress to viscous
Viscoelastic/viscoplastic models. (Naghdi-Murch theory [26]). They demonstrate the viscous effects always as before as after exceedition of yield limit. •
Among many viscoplastic fluids, there is a special class called Bingham plastics.

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The dynamics of a single elastoviscoplastic drop immersed in plane shear ﬂow of a Newtonian ﬂuid is studied by three-dimensional direct numerical simulations using a ﬁnite-difference and level-set method combined with the Saramito model for the elasto-viscoplastic ﬂuid. This model gives rise to a yield stress behavior, where the unyielded
Within the EU project YIELDGAP, we are looking for 3 PhD students to study viscoplastic and elastoviscoplastic fluids.

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### Yield-stress fluids in porous media : a comparison of - DiVA

It extends the Bingham viscoplastic model and the Oldroyd viscoelastic model. Fundamental flows are studied: simple shear flow, uniaxial elongation and large amplitude oscillatory shear. We model the rheological behavior of the yield-stress fluid using the recently developed elastoviscoplastic constitutive equation that takes into account the elastic and viscoplastic deformations Viscoplastic fluids exhibit a threshold in applied stress (yield stress) below which the material behaves like an elastic solid, and above which it flows like a liquid.

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Within the EU project YIELDGAP, we are looking for 3 PhD students to study viscoplastic and elastoviscoplastic fluids.

## Doctoral students in simulations and experiments with

Mendes, Flow of elasto-viscoplastic thixotropic liquids Journal of Non-Newtonian Fluid Mechanics journal homepage: www.elsevier. com/locate/jnnfm. The “avalanche effect” of an elasto-viscoplastic thixotropic Post Doc., Aalto University, Finland - Cited by 282 - Computational fluid Computational modeling of multiphase viscoelastic and elastoviscoplastic flows. For this purpose, the elasto-viscoplasticity (EVP) overstress theory is combined insucient time for pore fluid drainage and pore pressure equalization (Kolsky Mots clefs : copper alloy, elasto-viscoplasticity, damage, extreme loading, identification, robustness. 1 Introduction. Lifetime of Liquid Rocket Engine chambers is Elastoviscoplastic fluid, Particle migration, Viscoelastic fluid, Yield-stress fluid, Yield stress, Buoyant rigid sphere, Elasto-viscoplastic, Elasto-viscoplasticity, 18 Oct 2019 We propose a numerically stable and computationally efficient elasto-visco- plastic self-consistent (VPSC) crystal plasticity model, where the The constitutive structure of the EVP fluid obeys a linear combination of the Phan- Thien-Tanner model for viscoelastic fluids and the Bingham model for 26 Oct 2020 L27 Elasto-visco-plastic response: creep, stress relaxation, and L38 Coupled fluid-driven fracture problem: PKN step-by-step solution.

We include this modification in a A new elastoviscoplastic model based on the Herschel-Bulkley viscoplastic model Pierre Saramito To cite this version: Pierre Saramito. A new elastoviscoplastic model based on the Herschel-Bulkley viscoplastic model. Journal of Non-Newtonian Fluid Mechanics, Elsevier, 2009, 158 (1-3), pp.154-161. �10.1016/j.jnnfm.2008.12.001�.