195 citations · 427 across the 7 of their papers we have counts for
7 papers
Inertia-driven and elastoinertial viscoelastic turbulent channel flow simulated with a hybrid pseudo-spectral/finite-difference numerical scheme
Lu Zhu, Li Xi
Numerical simulation of viscoelastic flows is challenging because of the hyperbolic nature of viscoelastic constitutive equations. Despite their superior accuracy and efficiency, p…
Nonasymptotic elastoinertial turbulence for asymptotic drag reduction
Lu Zhu, Li Xi
Polymer-induced drag reduction is bounded by an asymptotic limit of maximum drag reduction (MDR). For decades, researchers have presumed that MDR reflects the convergence to an ult…
Turbulent drag reduction by polymer additives: Fundamentals and recent advances
Li Xi
A small amount of polymer additives can cause substantial reduction in the energy dissipation and friction loss of turbulent flow. The problem of polymer-induced drag reduction has…
Vortex axis tracking by iterative propagation (VATIP): a method for analysing three-dimensional turbulent structures
Lu Zhu, Li Xi
Vortex is a central concept in the understanding of turbulent dynamics. Objective algorithms for the detection and extraction of vortex structures can facilitate the physical under…
Vortex dynamics in low- and high-extent polymer drag reduction regimes revealed by vortex tracking and conformation analysis
Lu Zhu, Li Xi
Turbulent flow profiles are known to change between low- (LDR) and high-extent drag reduction (HDR) regimes. It is however not until recently that the LDR-HDR transition is recogni…
Active and hibernating turbulence in minimal channel flow of Newtonian and polymeric fluids
Li Xi, Michael D. Graham
Turbulent channel flow of drag-reducing polymer solutions is simulated in minimal flow geometries. Even in the Newtonian limit, we find intervals of "hibernating" turbulence that d…