2021 Fiscal Year Annual Research Report
Spectral structure of turbulent Taylor-Couette flows
| Project/Area Number |
19K04180
|
|---|
| Research Institution | Okinawa Institute of Science and Technology Graduate University |
|---|
Principal Investigator |
チャクラボルティ ピナキ 沖縄科学技術大学院大学, 流体力学ユニット, 教授 (90745928)
|
|---|
| Project Period (FY) |
2019-04-01 – 2022-03-31
|
| Keywords | Taylor-Couette flows / turbulent energy spectra / small-scale universality |
|---|
| Outline of Annual Research Achievements |
The turbulent Taylor-Couette (TC) flow, is replete with theory-defying features. Most notably, previous studies show that its energy spectrum, which quantifies how the kinetic energy is apportioned amongst turbulent eddies, is manifestly unlike that of other turbulent flows. This finding directly contradicts small-scale universality, a foundational tenet in the phenomenological theory of turbulence. In this research project we have conduced measurements of the energy spectra in turbulent TC flow from a new, unique, and extensive set of flying hot-wire experiments in the OIST-TC setup. Our experiments span both co-rotating and counter-rotating cylinders. In contrast with previous studies, our results show that the spectral structure of small scales in turbulent TC flow is in excellent accord with Kolmogorov's theory of small-scale universality. We also resolve the reasons for inconsistency with previous studies.
|
