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DYNAMICS OF ELASTO-INERTIAL TURBULENCE IN FLOWS WITH POLYMER ADDITIVES

Vincent E. Terrapon
Department of Aerospace and Mechanical Engineering, University of Liege

Yves Dubief
Laboratoire des Ecoulements Geophysiques et Industriels BP53, 38041 Grenoble-Cedex, France; School of Engineering University of Vermont 201 Votey Bldg Burlington, Vermont, VT 05405, USA

Julio Soria
Laboratory for Turbulence Research in Aerospace and Combustion Department of Mechanical and Aerospace Engineering Monash University Clayton, Victoria, 3800, Australia; Department of Aeronautical Engineering King Abdulaziz University, Jeddah, Saudi Arabia

Résumé

The dynamics of elasto-inertial turbulence is investigated numerically from the perspective of the coupling between polymer dynamics and flow structures. In particular, direct numerical simulations of channel flow with Reynolds numbers ranging from 1000 to 6000 are used to study the formation and dynamics of elastic instabilities and their effects on the flow. Based on the splitting of the pressure into inertial and polymeric contributions, it is shown that the trains of cylindrical structures around sheets of high polymer extension that are characteristics to elasto-inertial turbulence are mostly driven by polymeric contributions.