Experimental Study on a Side-By-Side Configuration of Two Cylinders Helically Covered by Triple Rods

Rudi Walujo Prastianto*, Bagas Pumbarino

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Many investigations had been done both numerically and experimentally, on the characteristics of multiple-arranged cylinders especially in terms of the induced fluid forces and responses caused by external fluid flows acting on them. This paper discusses the investigation result on induced drag of two cylinders helically wrapped around by triple rods with certain gap in air flow fields. The model cylinders were installed in the test section of a wind tunnel as a side-by-side arrangement and treated as roll supports at ends of the cylinders. The model was executed at subcritical regime of incoming uniform air flow acting perpendicular to the cylinders that related to Reynolds number of 3.9 × 104 and evaluated for different gaps between the cylinder of 1.75D, 2.0D, and 2.50D, respectively, where D is diameter of the bare cylinder. Load cells were used for measuring the drag occurring on the cylinders. For all gap variety evaluated results demonstrated that greater coefficient of drag (CD) happened in the two cylinders which was caused by more prominent interference between them. The CD increased greater than other gaps for the cylinder’s gap of 2.0D that was well confirmed against others relevant works. For this side-by-side configuration, the CD of the lower and upper cylinders significantly increased in contrast with the single cylinder case by 55.8% and 55.5%, respectively.

Original languageEnglish
Title of host publicationRecent Advances in Mechanical Engineering - Select Proceedings of ICOME 2021
EditorsIvan Tolj, M.V. Reddy, Achmad Syaifudin
PublisherSpringer Science and Business Media Deutschland GmbH
Number of pages7
ISBN (Print)9789811908668
Publication statusPublished - 2023
Event5th International Conference on Mechanical Engineering, ICOME 2021 - Virtual, Online
Duration: 25 Aug 202126 Aug 2021

Publication series

NameLecture Notes in Mechanical Engineering
ISSN (Print)2195-4356
ISSN (Electronic)2195-4364


Conference5th International Conference on Mechanical Engineering, ICOME 2021
CityVirtual, Online


  • Drag
  • Experimental study
  • Side-by-side arrangement
  • Triple rods


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