Relaminarization phenomena by traveling wave-like control in wall turbulence

2014 Fiscal Year Final Research Report

• Project/Area Number: 25889018
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Fluid engineering
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: MAMORI Hiroya 東京農工大学, 工学(系)研究科(研究院), 特任助教 (80706383)
• Project Period (FY): 2013-08-30 – 2015-03-31
• Keywords: 乱流制御 / 抵抗低減 / 数値シミュレーション

Outline of Final Research Achievements

Skin-friction drag reduction control of wall turbulence is expected to contribute to reduce transport cost. In this study, a traveling wave-like control from walls is focused. The traveling control induces a relaminarization phenomenon in wall turbulence. Although a mechanism of the relaminarization phenomenon has not yet been elucidated, previous studies showed that the spatial development of the control effect played important role. Therefore, in this study we made numerical simulations and experiments in order to clarify the spatial development effect on the relaminarization phenomenon. The numerical simulation shows that vortical structure gradually decreases in the downstream direction and the process is clearly observed.
Although a similar tendency is obtained in experiments, the control effect attenuates at the downstream region since the wave amplitude decreases.

Free Research Field

流体工学