Effect of finite Weissenberg number on turbulent channel flows of an elastoviscoplastic fluid

Direct numerical simulations are carried out to study the effect of finite Weissenberg number up $Wi=16$ on laminar and turbulent channel flows an elastoviscoplastic (EVP) fluid, at a fixed bulk Reynolds $2800$ . The incompressible flow equations coupled with evolution equation for EVP stress tensor by modified Saramito model that extends both Bingham viscoplastic extensible nonlinear elastic-Peterlin (FENE-P) viscoelastic models. In flow, we find drag decreases numbers, until laminarises high enough elastic yield stresses. Hence, higher reduction is achieved than in same number. persists numbers 20, contrast where increases regime compared Newtonian flow. Moreover, elasticity affects laminarisation non-monotonic fashion, delaying it lower promoting numbers. A hibernation phenomenon observed leading large changes unyielded regions. Finally, plasticity affect low- high-speed streaks equally, attenuating dissipation fragmentation structures.