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The Steady Wake of a Wall-Mounted Rectangular Prism with a Large-Depth-Ratio at Low Reynolds Numbers

Author

Listed:
  • Arash Zargar

    (Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
    These authors contributed equally to this work.)

  • Ali Tarokh

    (Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
    Department of Mechanical Engineering, Lakehead University, Thunder Bay, ON P7B 5E1, Canada
    These authors contributed equally to this work.)

  • Arman Hemmati

    (Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
    These authors contributed equally to this work.)

Abstract

The wakes of wall-mounted small (square) and large (long) depth-ratio rectangular prisms are numerically studied at Reynolds numbers of 50–250. The large depth-ratio significantly alters the dominance of lateral secondary flow (upwash and downwash) in the wake due to the reattachment of leading-edge separated flow on the surfaces of the prism. This changes the wake topology by varying the entrained flow in the wake region and changing the distribution of vorticity. Thus, the magnitude of vorticity significantly decreases by increasing the prism depth-ratio. Furthermore, the length of the recirculation region and the orientation of near wake flow structures are altered for the larger depth-ratio prism compared to the square prism. Drag and lift coefficients are also affected due to the change of pressure distributions on the rear face of the prism and surface friction force. This behavior is consistently observed for the entire range of Reynolds numbers considered here. The wake size is scaled with R e 1 / 2 , whereas drag coefficient scaled with R e − 0.3 .

Suggested Citation

  • Arash Zargar & Ali Tarokh & Arman Hemmati, 2021. "The Steady Wake of a Wall-Mounted Rectangular Prism with a Large-Depth-Ratio at Low Reynolds Numbers," Energies, MDPI, vol. 14(12), pages 1-23, June.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:12:p:3579-:d:575964
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    Cited by:

    1. Ebubekir Beyazoglu & Bahadir Erman Yuce & Murat Ates & Rumeysa Yalindag & Kemal Furkan Sokmen & Erhan Pulat, 2022. "Cooling of Heated Blocks with Triangular Guide Protrusions Simulating Printed Circuit Boards," Sustainability, MDPI, vol. 14(23), pages 1-27, November.

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