caa a22 4500 605466564 CHVBK 20210128100307.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s00397-014-0810-2 doi (NATIONALLICENCE)springer-10.1007/s00397-014-0810-2 Numerical modelling of thixotropic and viscoelastoplastic materials in complex flows [Elektronische Daten] [J. López-Aguilar, Michael Webster, Hamid Tamaddon-Jahromi, Octavio Manero] This study is concerned with the finite element/finite volume (fe/fv) simulation of thixotropic and viscoelastoplastic material systems through two model approaches: (i) a new micellar thixotropic constitutive model for wormlike micellar systems (that introduces viscoelasticity into the network structure construction/destruction kinetic equation) and (ii) adopting a Bingham-Papanastasiou model. The computational approach is based on a hybrid parent/subcell scheme, which is cast about a semi-implicit incremental pressure correction (ipc) scheme. The appearance of plastic behaviour arises through the micellar polymeric viscosity, by increasing the zero-shear viscosity (low solvent fractions), whilst the Bingham-Papanastasiou introduces plastic features through the solvent viscosity. The characteristics of thixotropic wormlike micellar systems are represented through the class of Bautista-Manero models. Correction is incorporated, based on physical arguments for fluidity, in which absolute values of the dissipation function are adopted in complex flow, thereby accessing low-solvent fractions and high-elasticity levels. Considering elastic and plastic influences separately, solutions are compared and contrasted for contraction-expansion flow, identifying such flow field features as vortex dynamics, stress field structure, yield front patterns and enhanced pressure drop. Particular attention is paid to the influence of enhanced strain hardening that is introduced through stronger thixotropic structural features. Vortex activity decreases as either We is increased at a fixed τ 0 or τ 0 is increased at a fixed We. Exaggerated strain-hardening properties are observed to have a major impact on vortex activity. Patterns and trends in normal stress difference fields reflect those in re-entrant corner vortex patterns. Yield front patterns are significantly influenced with yield stress τ 0 variation and more so than elevation in elasticity. Findings on excess pressure drop (epd) versus increased yield stress (τ 0) follow a linear trend. Consistently, it is evident that any variation that leads to a more solid-like behaviour produces epd enhancement. In addition, relatively more structured fluids display distinctly larger epd values throughout the τ 0 range covered. Springer-Verlag Berlin Heidelberg, 2014 Yield fronts nationallicence Yield stress nationallicence Wormlike micelles nationallicence Bautista-Manero models nationallicence Hybrid finite element/volume method nationallicence Enhanced oil recovery nationallicence Papanastasiou regularisation nationallicence Thixotropy nationallicence López-Aguilar J. Institute of Non-Newtonian Fluid Mechanics, College of Engineering, Swansea University, SA2 8PP, Swansea, UK aut Webster Michael Institute of Non-Newtonian Fluid Mechanics, College of Engineering, Swansea University, SA2 8PP, Swansea, UK aut Tamaddon-Jahromi Hamid Institute of Non-Newtonian Fluid Mechanics, College of Engineering, Swansea University, SA2 8PP, Swansea, UK aut Manero Octavio Instituto de Investigaciones en Materiales, UNAM, 04510, Mexico City, Mexico aut Rheologica Acta Springer Berlin Heidelberg 54/4(2015-04-01), 307-325 0035-4511 54:4<307 2015 54 397 https://doi.org/10.1007/s00397-014-0810-2 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-014-0810-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- López-Aguilar J. Institute of Non-Newtonian Fluid Mechanics, College of Engineering, Swansea University, SA2 8PP, Swansea, UK aut NATIONALLICENCE 700 1- Webster Michael Institute of Non-Newtonian Fluid Mechanics, College of Engineering, Swansea University, SA2 8PP, Swansea, UK aut NATIONALLICENCE 700 1- Tamaddon-Jahromi Hamid Institute of Non-Newtonian Fluid Mechanics, College of Engineering, Swansea University, SA2 8PP, Swansea, UK aut NATIONALLICENCE 700 1- Manero Octavio Instituto de Investigaciones en Materiales, UNAM, 04510, Mexico City, Mexico aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/4(2015-04-01), 307-325 0035-4511 54:4<307 2015 54 397