Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session S01: Poster Session & Refreshment Break IV (3:34 - 4:25 p.m.)
3:34 PM,
Monday, November 20, 2023
Room: Exhibit Hall D
Abstract: S01.00174 : Application of triple decomposition on cylinder wake energy budget*
Presenter:
Kwanho Ree
(Seoul National University)
Authors:
Kwanho Ree
(Seoul National University)
Jin Hwan Hwang
(Seoul National University)
The data set of the two-dimensional velocity field was acquired from laboratory experiments conducted using particle image velocimetry in a flume. We applied triple decomposition on flow fields behind a circular cylinder by using proper orthogonal decomposition. Then, we estimated the kinetic energy budgets of those three components respectively and investigated the structure of energy transfer among the components.
When we combined the first and second modes, their combinations propagated downstream oscillating with a frequency. The energy transfers from mean shear fields to wake and turbulence in similar amounts, but energy from wake to turbulence did not occur significantly. Therefore, it proves that the wake must be a form of waves as previously pointed out.
*This research was supported by Korea Institute of Marine Science & Technology Promotion (KIMST) funded by the Ministry of Oceans and Fisheries (RS-2023-00254680).
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