Low Reynolds number turbulent flows over elastic walls

• Marco E., Rosti

• Luca, Brandt

抄録

We study the laminar and turbulent channel flow over a viscous hyper-elastic wall and show that it is possible to sustain an unsteady chaotic turbulent-like flow at any Reynolds number by properly choosing the wall elastic modulus. We propose a physical explanation for this effect by evaluating the shear stress and the turbulent kinetic energy budget in the fluid and elastic layer. We vary the bulk Reynolds number from 2800 to 10 and identify two distinct mechanisms for turbulence production. At moderate and high Reynolds numbers, turbulent fluctuations activate the wall oscillations, which, in turn, amplify the turbulent Reynolds stresses in the fluid. At a very low Reynolds number, the only production term is due to the energy input from the elastic wall, which increases with the wall elasticity. This mechanism may be exploited to passively enhance mixing in microfluidic devices.

source:https://aip.scitation.org/doi/10.1063/5.0018770

収録刊行物

• Physics of Fluids

  Physics of Fluids 32 (8), 083109-, 2020-08-20

  AIP Publishing

キーワード

• Condensed Matter Physics
• Fluid Flow and Transfer Processes
• Mechanics of Materials
• Computational Mechanics
• Mechanical Engineering

詳細情報

• CRID: 1050849378481952512
• NII論文ID: 120006900836
• ISSN: 10706631
• ISSN: 10897666
• DOI: 10.1063/5.0018770
• Web Site: http://id.nii.ac.jp/1394/00001605/
• Web Site: https://pubs.aip.org/aip/pof/article-pdf/doi/10.1063/5.0018770/16004990/083109_1_online.pdf
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • Crossref
  • CiNii Articles