Seminar

Predicting the behavior of complex fluids in domains with a generic geometry is a formidable challenge. Indeed, standard rheological measurements are mostly confined to simple shear flows and purely extensional flows, but neither flow type can faithfully represent all the conditions encountered in real flows. The development of computational techniques able to simulate flow conditions that are difficult to realize in well-controlled experiments is of paramount importance for achieving a more complete rheological characterization. In parallel, it is necessary to develop a coherent framework for the interpretation of computational data obtained under rarely-explored conditions. In this talk, a newly developed rheometric scheme will be presented [Giusteri and Seto, J. Rheol. 2018]. Such a theoretical framework generalizes the standard viscometric framework used for several decades as the basis for steady-state rheometry, it offers a firm ground for the interpretation of measurements in non-viscometric flows, and provides an ideal scheme for effective data-driven models. In fact, it is a model-independent framework and opens the way for a practical use of computationally generated constitutive relations.