Roney L. Thompson

TL;DR: In this article, a constitutive model for elasto-viscoplastic thixotropic materials is proposed, consisting of two differential equations, one for the stress and the other for the structure parameter, a scalar quantity that indicates the structuring level of the microstructure.

TL;DR: The literature on thixotropy modeling is reviewed in this paper, with particular emphasis on models for yield stress materials that possess elasticity, and various possible approaches that have been adopted to model the different facets of the mechanical behavior of this kind of materials are compared and discussed in detail.

TL;DR: In this article, the authors analyze the dimensionless numbers that concern the flow of viscoplastic materials and show that the characteristic stress should be defined as the extra-stress intensity evaluated at a characteristic (maximum) deformation rate.

TL;DR: In this article, the momentum balance equation is used to calculate the mean velocity profile by considering the Reynolds stress tensor provided by DNS, which can be used to extract a more accurate turbulent viscosity for turbulence modeling purposes.

TL;DR: In this article, the dependence of the Reynolds stress tensor on mean kinematic tensor basis is quantified using tensor decomposition theorems, which allow to extract from the anisotropic Reynolds tensor the part that is linear or nonlinear in the strain rate tensor D, and the parts that are in-phase (sharing the same eigenvectors) and out-of-phase with strain rate D. The results have shown that the tensorial form of the linear Boussinesq hypothesis is not a good assumption even in the region