Near wake control of a square cylinder by screen shrouds

Haklıgör İ. M., Özkan G. M.

OCEAN ENGINEERING, cilt.343, sa.1, ss.1-10, 2026 (SCI-Expanded)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 343 Sayı: 1
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1016/j.oceaneng.2025.123244
  • Dergi Adı: OCEAN ENGINEERING
  • Derginin Tarandığı İndeksler: Applied Science & Technology Source, Scopus, Aerospace Database, Science Citation Index Expanded (SCI-EXPANDED), Academic Search Premier, PASCAL, Aquatic Science & Fisheries Abstracts (ASFA), Communication Abstracts, Compendex, Computer & Applied Sciences, Environment Index, ICONDA Bibliographic, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.1-10
  • Çukurova Üniversitesi Adresli: Evet

Özet

This study investigates the influence of screen shrouds with varying permeability on the wake dynamics of a square cylinder at a Reynolds number of Re = 13600. High-resolution Particle Image Velocimetry (PIV) measurements were conducted in a closed-loop water channel using screen shrouds with permeability ratios of β = 0.46, 0.63, and 0.7 concentrically mounted around the square cylinder. The shrouds acted as passive flow control elements by altering the momentum distribution and delaying the interaction of separated shear layers. The experimental results indicate that moderate permeability (β = 0.63) showed effective flow control. The peak turbulent kinetic energy and Reynolds shear stress were reduced by 30 % and 25 %, respectively, compared to the square cylinder. In this configuration, the vortex formation length increased by 137.2 %, while the shear layer length increased by 62.8 %, and wake width narrowed by 17.3 %, indicating stabilized near-wake turbulence and delayed vortex roll-up. These findings demonstrate that applying a screen shroud with an appropriate permeability not only suppresses the influence of fluctuating components but also delays the interaction of shear layers, confirming the effectiveness of this passive flow control approach.