26 Oct 2020 L27 Elasto-visco-plastic response: creep, stress relaxation, and L38 Coupled fluid-driven fracture problem: PKN step-by-step solution.

the classical J2-viscoplasticity with a flow criterion expressed in the current In this elasto-viscoplastic formulation, the effective stress ¯σ is no longer 

An analytical study of elastoviscoplastic fluid flow in tubes of non-circular cross section is presented. The constitutive structure of the fluid is described by a linear frame invariant combination of the Phan-Thien−Tanner model of viscoelastic fluids and the Bingham model of plastic fluids. they behave as purely viscous fluids, with constant or shear thinning viscosity. Viscoplastic fluids can present elasticity and thixotropy. Recently, an Oldroyd-B type constitutive equation was proposed by (de Souza Mendes, 2009) to model the behavior of elasto-viscoplastic fluids, and also thixotropy. The equation involves the Emad Chaparian, Daulet Izbassarov, Francesco De Vita, Luca Brandt, Outi Tammisola, Yield-stress fluids in porous media: a comparison of viscoplastic and elastoviscoplastic flows, Meccanica, 10.1007/s11012-019-01010-6, (2019). Yet, the velocity fields in the viscoplastic and elastoviscoplastic flows are comparable for small elastic effects.

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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�. �hal Elastoviscoplastic behavior model of electrorheological fluids in various deformation modes E V Korobko1, M A Zhurauski and A A Makhaniok A.V. Luikov Heat and Mass Transfer Institute of NAS Belarus, 220072, 15 P. Brovka str., Minsk, Belarus E-mail: evkorobko@gmail.com Abstract.

Journal of Non-Newtonian Fluid Mechanics, Elsevier, 2009, 158 (1-3), pp.154-161. �10.1016/j.jnnfm.2008.12.001�.

Elastoviscoplastic (EVP) fluids can be found in geophysical applications, such as mudslides and the tectonic dynamic of the Earth. The EVP fluids are also found in industrial applications such as mining operations, the conversion of biomass into fuel, and the petroleum industry, to name a few.

In the present work, we solve the numerical problem of elasto-viscoplastic drops colliding in vertical plane. The free 9. de Souza Mendes, P. R., and R. L. Thompson, “ A unified approach to model elasto-viscoplastic thixotropic yield-stress materials and apparent yield-stress fluids,” Rheol. Acta 52 , 673– 694 (2013).

Among many viscoplastic fluids, there is a special class called Bingham plastics. For Bingham plastic fluid, the shear stress beyond the yield stress is linearly 

method with mixed boundary conditions for elasto-viscoplastic problems. of isotope separation and the lowest liquid holdup for a trickle bed-type column.

We focus on viscoplastic and elastoviscoplastic flows to reveal some differences and similarities between these two classes of flows. Small elastic effects increase the pressure drop and also the size of unyielded regions in the flow which is the consequence of different stress solutions compare to viscoplastic flows.
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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 of the material [Saramito, J. Non-Newton.

International audienceFrom a thermodynamic theory, a new model for elastoviscoplastic fluid flow is presented.
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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

Assuming that the bubble remains spherical during Lattice strains and textures in the polycrystalline sample are recorded using in-situ synchrotron x-ray diffraction and are modeled with Elasto-Viscoplastic Self Consistent (EVPSC) methods. Parameters such as critical resolved shear stress (CRSS) for the various slip systems, strain hardening, initial grain shape, and the strength of the grain–neighborhood interaction are tested in order to Viscoplastic fluids: from theory to application (VPF2009), Limassol, Cyprus, 1–5 November, 2009 yield stress responses in elastoviscoplastic materials. 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. We plan experiments, numerical simulations and modelling of the fluid behavior from the basic interactions determining its microstructure.The project exploits highly accurate simulations and state-of-the-art experiments to study complex fluids behavior in complex geometries.