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Wind and Structures
  Volume 34, Number 1, January 2022 (Special Issue) pages 1-14

On the numerical simulation of perforated bluff-bodies: A CFD study on a hollow porous 5:1 rectangular cylinder
Mao Xu, Luca Patruno, Yuan-Lung Lo, Stefano de Miranda and Francesco Ubertini

    In this work the flow through a hollow porous 5:1 rectangular cylinder made of perforated plates is numerically investigated by means of 2D URANS based simulations. Two approaches are adopted to account for the porous surfaces: in the first one the pores are explicitly modeled, so providing a detailed representation of the flow. In the second one, the porous surfaces are modeled by means of pressure jumps, which allow to take into account the presence of pores without reproducing the flow details. Results obtained by using the two aforementioned techniques are compared aiming at evaluating differences and similarities, as well as identifying the main flow features which might cause discrepancies. Results show that, even in the case of pores remarkably smaller than the immersed body, their arrangement can lead to local mechanisms able to affect the global flow arrangement, so limiting the accuracy of pressure jumps based simulations. Despite that, time-averaged fields often show a reasonable agreement between the two approaches.
Key Words
    porosity; porous bluff-body; porous surface; pressure jump
Mao Xu: DICAM, University of Bologna, Bologna, Italy

Luca Patruno: DICAM, University of Bologna, Bologna, Italy

Yuan-Lung Lo: Department of Civil Engineering, National Taipei University of Technology, Taipei, Taiwan

Stefano de Miranda: DICAM, University of Bologna, Bologna, Italy

Francesco Ubertini: DICAM, University of Bologna, Bologna, Italy

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