Scholarlink

In this study, smooth bed experiments were conducted to compare the flow patterns around a plain cylinder and a cylinder equipped with helical strakes. A 2D Particle Image Velocimetry (PIV) was used to collect the velocity data near the upstream of the cylinders. This data was then analyzed to understand the mean flow pattern, turbulent kinetic energy (TKE), and Reynolds stresses. The study findings revealed that the presence of strakes caused the downflow to shift away from the mid-plane. Additionally, there was a decrease in the curvature of the streamlines for the straked cylinder compared to the plain cylinder. These results indicate a decrease in the strength of the horseshoe vortex (HSV) upstream of the cylinder due to helical strakes, which can potentially reduce the local scouring close to the upstream of the piers.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Comparison of Upstream Flow Pattern Around Cylinders with and Without Strakes

  • 会议论文

  • 发表日期：

    2025年

查看全文
  • Tapas Kumar Pradhan,
  • Abhinav Thakurta,
  • Vesselina Roussinova,
  • Ram Balachandar

摘要

In this study, smooth bed experiments were conducted to compare the flow patterns around a plain cylinder and a cylinder equipped with helical strakes. A 2D Particle Image Velocimetry (PIV) was used to collect the velocity data near the upstream of the cylinders. This data was then analyzed to understand the mean flow pattern, turbulent kinetic energy (TKE), and Reynolds stresses. The study findings revealed that the presence of strakes caused the downflow to shift away from the mid-plane. Additionally, there was a decrease in the curvature of the streamlines for the straked cylinder compared to the plain cylinder. These results indicate a decrease in the strength of the horseshoe vortex (HSV) upstream of the cylinder due to helical strakes, which can potentially reduce the local scouring close to the upstream of the piers.