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Wind and Structures
  Volume 35, Number 1, July 2022 , pages 67-81
DOI: https://doi.org/10.12989/was.2022.35.1.067
 


Simulation of porous claddings using LES and URANS: A 5:1 rectangular cylinder
Mao Xu, Luca Patruno, Yuan-Lung Lo, Stefano de Miranda and Francesco Ubertini

 
Abstract
    While the aerodynamics of solid bluff bodies is reasonably well-understood and methodologies for their reliable numerical simulation are available, the aerodynamics of porous bluff bodies formed by assembling perforated plates has received less attention. The topic is nevertheless of great technical interest, due to their ubiquitous presence in applications (fences, windbreaks and double skin facades to name a few). This work follows previous investigations by the authors, aimed at verifying the consistency of numerical simulations based on the explicit modelling of the perforated plates geometry and their representation by means of pressure-jumps. In this work we further expand such investigations and, contextually, we provide insight into the flow arrangement and its sensitivity to important modelling and setup configurations. To this purpose, Unsteady Reynolds-Averaged Navier-Stokes (URANS) and Large-Eddy Simulations (LES) are performed for a 5:1 rectangular cylinder at null angle of attack. Then, using URANS, porosity and attack angle are simultaneously varied. To the authors' knowledge this is the first time in which LES are used to model a porous bluff body and compare results obtained using the explicit modelling approach to those obtained relying on pressure-jumps. Despite the flow organization often shows noticeable differences, good agreement is found between the two modelling strategies in terms of drag force.
 
Key Words
    aerodynamics; attack angle; computational wind engineering; perforated plates; porosity
 
Address
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:Department of Civil Engineering, National Taipei University of Technology, Taipei, Taiwan

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

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

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