Ring-bursting behavior en route to turbulence in narrow-gap Taylor-Couette flows Journal Article

Author(s): Altmeyer, Sebastian; Do, Younghae; Lai, Ying-Cheng
Article Title: Ring-bursting behavior en route to turbulence in narrow-gap Taylor-Couette flows
Affiliation IST Austria
Abstract: We investigate the Taylor-Couette system where the radius ratio is close to unity. Systematically increasing the Reynolds number, we observe a number of previously known transitions, such as one from the classical Taylor vortex flow (TVF) to wavy vortex flow (WVF) and the transition to fully developed turbulence. Prior to the onset of turbulence, we observe intermittent bursting patterns of localized turbulent patches, confirming the experimentally observed pattern of very short wavelength bursts (VSWBs). A striking finding is that, for a Reynolds number larger than that for the onset of VSWBs, a new type of intermittently bursting behavior emerges: patterns of azimuthally closed rings of various orders. We call them ring-bursting patterns, which surround the cylinder completely but remain localized and separated in the axial direction through nonturbulent wavy structures. We employ a number of quantitative measures including the cross-flow energy to characterize the ring-bursting patterns and to distinguish them from the background flow. These patterns are interesting because they do not occur in the wide-gap Taylor-Couette flow systems. The narrow-gap regime is less studied but certainly deserves further attention to gain deeper insights into complex flow dynamics in fluids.
Keywords: Quantitative measures; Onset of turbulence; Reynolds number; Turbulent flow; Vortex flow; Complex flow dynamics; Short wavelengths; Taylor Couette flow; Taylor vortex flows; Taylor-Couette systems; Wavy structures
Journal Title: Physical Review E Statistical Nonlinear and Soft Matter Physics
Volume: 92
Issue 5
ISSN: 1539-3755
Publisher: American Institute of Physics  
Date Published: 2015-11-24
Start Page: Article number: 053018
DOI: 10.1103/PhysRevE.92.053018
Notes: Y.D. was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2013R1A1A2010067). Y.-C. L. was supported by AFOSR under Grant No. FA9550-15-1-0151.
Open access: no