Numerical study of unsteady flow past compound cylinders

Authors

  • Mohammed M Mosallem Mechanical Engineering Department, Jazan University, Jazan, 45142, Saudi Arabia
  • Haitham M Hadidi Mechanical Engineering Department, Jazan University, Jazan, 45142, Saudi Arabia
  • Mohammed Y Tharwan Mechanical Engineering Department, Jazan University, Jazan, 45142, Saudi Arabia
  • Zeinab A Ahmed Architecture Department, Jazan University, Jazan, 45142, Saudi Arabia

DOI:

https://doi.org/10.3329/bjsir.v57i4.58987

Keywords:

Numerical; Unsteady flow; Compound cylinders; Vortex shedding

Abstract

The flow over compound cylinders is simulated using computational fluid dynamic (CFD). Three contacting cylinders of different diameters, arranged in tandem with respect to the oncoming flow were examined at Reynolds number ReD = 333 based on the diameter of the middle cylinder, D. The proposed configuration simulates the wind flow over the satellite launch vehicles during the period of launch. Computations were performed for diameter-to-diameter ratio, d / D, of 0.8 and 0.6. The numerical results revealed the vortex formation and vortex shedding mechanism in the wake downstream of the cylinders. For d / D = 0.6, the near wake is wider than that of d / D = 0.8. It is also found that the base pressure coefficient values for d / D = 0.6 are lower than those for d / D = 0.8. These findings imply that the acting drag force on the cylinders for d / D = 0.6 is larger than that for d / D = 0.8. Concluding that, the base pressure coefficient depends on the diameter ratio d / D whereas, the computed vortex-shedding Strouhal number value was found to be 0.25 and is independent on the d / D ratio.

Bangladesh J. Sci. Ind. Res. 57(4), 215-220, 2022

Downloads

Download data is not yet available.
Abstract
30
PDF
31

Downloads

Published

2022-12-25

How to Cite

Mosallem , M. M., Hadidi, H. M., Tharwan, M. Y., & Ahmed, Z. A. (2022). Numerical study of unsteady flow past compound cylinders. Bangladesh Journal of Scientific and Industrial Research, 57(4), 215–220. https://doi.org/10.3329/bjsir.v57i4.58987

Issue

Vol. 57 No. 4 (2022)

Section

Articles

License

Copyright (c) 2022 Bangladesh Council of Scientific and Industrial Research

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Bangladesh Council of Scientific and Industrial Research (BCSIR) holds the copyright to all contents published in Bangladesh Journal of Scientific and Industrial Research (BJSIR). A copyright transfer form should be signed by the author(s) and be returned to BJSIR.

The entire contents of the BJSIR are protected under Bangladesh Council of Scientific and Industrial Research (BCSIR) copyrights.

Creative Commons Licence
BJSIR is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial License (CC BY-NC) Creative Commons Attribution-NonCommercial 4.0 International License which allows others remix, tweak, and build upon the articles non-commercially, and although their new works must also acknowledge and be non-commercial, they don’t have to license their derivative works on the same terms.