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

Arash Zargar, Ali Tarokh and Arman Hemmati
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Arash Zargar: Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
Ali Tarokh: Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
Arman Hemmati: Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada

Energies, 2021, vol. 14, issue 12, 1-23

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 .

Keywords: wake dynamics; DNS; wall mounted; prism; CFD; heat exchange; depth ratio (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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