192 citations · 628 across the 19 of their papers we have counts for
19 papers · 1 filter
Scaling and mechanism of the propagation speed of the upstream turbulent front in pipe flow
Haoyang Wu, Baofang Song
Scaling and mechanism of the propagation speed of turbulent fronts in pipe flow with the Reynolds number has been a long-standing problem in the past decades. Here, we derive an ex…
Size-dependent transient nature of localized turbulence in transitional channel flow
Duo Xu, Baofang Song
It has been reported that a fully localized turbulent band in channel flow becomes sustained when the Reynolds number is above a threshold. Here we show evidences that turbulent ba…
Linear stability of channel flow with microgroove-type anisotropic superhydrophobic walls
Xueyan Zhai, Kaiwen Chen, Baofang Song
We study the temporal linear instability of channel flow subject to a tensorial slip boundary condition that models the slip effect induced by microgroove-type super-hydrophobic su…
A numerical study of the side-wall effects on turbulent bands in channel flow at transitional Reynolds numbers
Haoyang Wu, Baofang Song
We investigated the side-wall effects on turbulent bands in channel flow at transitional Reynolds numbers by direct numerical simulations using the open source spectral-element cod…
Propagation speed of turbulent fronts in pipe flow at high Reynolds numbers
Kaiwen Chen, Duo Xu, Baofang Song
We investigated the propagation of turbulent fronts in pipe flow at high Reynolds numbers by direct numerical simulation. We used a technique combining a moving frame of reference…
Direct numerical simulation of two-phase pipe flow: influence of the domain length on the flow regime
Carlos Plana, Baofang Song, Marc Avila
We perform direct numerical simulations of a kerosene-water mixture in pipe flow under realistic experimental conditions by solving the Cahn-Hilliard-Navier-Stokes equations. We co…
Non-modal transient growth of disturbances in pulsatile and oscillatory pipe flow
Duo Xu, Baofang Song, Marc Avila
Laminar flows through pipes driven at steady, pulsatile or oscillatory rates undergo a sub-critical transition to turbulence. We carry out an extensive linear non-modal stability a…
Trigger turbulent bands directly at low Reynolds numbers in channel flow using a moving-force technique
Baofang Song, Xiangkai Xiao
We show a method, for direct numerical simulations, to trigger and maintain turbulent bands directly at low Reynolds numbers in channel flow. The key is to impose a moving localise…
Nonlinear hydrodynamic instability and turbulence in pulsatile flow
Duo Xu, Atul Varshney, Xingyu Ma +4
Pulsating flows through tubular geometries are laminar provided that velocities are moderate. This in particular is also believed to apply to cardiovascular flows where inertial fo…
Linear stability of slip pipe flow
Kaiwen Chen, Baofang Song
We investigated the linear stability of pipe flow with anisotropic slip length at the wall by considering streamwise and azimuthal slip separately as the limiting cases. Our numeri…
The growth mechanism of turbulent bands in channel flow at low Reynolds numbers
Xiangkai Xiao, Baofang Song
In this work, we carried out direct numerical simulations in large channel domains and studied the kinematics and dynamics of fully localised turbulent bands at Reynolds number Re…
Stability of slip channel flow revisited
Chunshuo Chai, Baofang Song
In this work, we revisit the temporal stability of slip channel flow. Lauga & Cossu (Phys. Fluids 17, 088106 (2005)) and Min & Kim (Phys. Fluids 17, 108106 (2005)) have investigate…
Phase-field simulation of core-annular pipe flow
Baofang Song, Carlos Plana, Jose M. Lopez +1
Phase-field methods have long been used to model the flow of immiscible fluids. Their ability to naturally capture interface topological changes is widely recognized, but their acc…
Destabilizing turbulence in pipe flow
J. Kühnen, B. Song, D. Scarselli +5
Turbulence is the major cause of friction losses in transport processes and it is responsible for a drastic drag increase in flows over bounding surfaces. While much effort is inve…
Transition to turbulence in pulsating pipe flow
Duo Xu, Sascha Warnecke, Baofang Song +2
Fluid flows in nature and applications are frequently subject to periodic velocity modulations. Surprisingly, even for the generic case of flow through a straight pipe, there is li…
Analysis and modeling of localized invariant solutions in pipe flow
Paul Ritter, Stefan Zammert, Bruno Eckhardt +1
Turbulent spots surrounded by laminar flow are a landmark of transitional shear flows, but the dependence of their kinematic properties on spatial structure is poorly understood. W…
Speed and structure of turbulent fronts in pipe flow
Baofang Song, Dwight Barkley, Björn Hof +1
Using extensive direct numerical simulations, the dynamics of laminar-turbulent fronts in pipe flow is investigated for Reynolds numbers between and . We here inves…
The rise of fully turbulent flow
Dwight Barkley, Baofang Song, Vasudevan Mukund +3
Over a century of research into the origin of turbulence in wallbounded shear flows has resulted in a puzzling picture in which turbulence appears in a variety of different states…
Deterministic and stochastic aspects of the transition to turbulence
Baofang Song, Björn Hof
The purpose of this contribution is to summarize and discuss recent advances regarding the onset of turbulence in shear flows. The absence of a clear cut instability mechanism, the…