19 citations · 35 across the 3 of their papers we have counts for
5 papers
Direct transition to elastoinertial turbulence from a linear instability in channel flow
Lu Zhu, Li Xi
For decades, transition to turbulence in viscoelastic parallel shear flows was believed to require nonlinear instabilities. We provide numerical evidences for a new wall-mode linea…
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…
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…