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<p>The turbulent dynamics of the boundary layer flow over an urban morphological model, under the influence of an upstream tall building, is investigated using Stereoscopic PIV (SPIV) in a boundary layer wind tunnel. A recently proposed method - Spectral Proper Orthogonal Decomposition (SPOD) is performed on the boundary layer velocity fluctuations, to separate the large scales and small scales. The separation method demonstrates reliable performance by revealing distinct patterns of periodic scale interaction within the boundary layer, which align with the most energetic frequencies observed in Hot-Wire Anemometry (HWA) measurements. The influence of the wake of a very tall building on the scale interaction extends across a broad range in the transverse direction, with the exception of the central area of the wake.</p>

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Investigation of Boundary Layer Scale Interactions Over Realistic Morphology Influenced by An Upstream Tall Building Using the SPOD Method

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • Haoran Du,
  • Laurent Perret,
  • Eric Savory

摘要

The turbulent dynamics of the boundary layer flow over an urban morphological model, under the influence of an upstream tall building, is investigated using Stereoscopic PIV (SPIV) in a boundary layer wind tunnel. A recently proposed method - Spectral Proper Orthogonal Decomposition (SPOD) is performed on the boundary layer velocity fluctuations, to separate the large scales and small scales. The separation method demonstrates reliable performance by revealing distinct patterns of periodic scale interaction within the boundary layer, which align with the most energetic frequencies observed in Hot-Wire Anemometry (HWA) measurements. The influence of the wake of a very tall building on the scale interaction extends across a broad range in the transverse direction, with the exception of the central area of the wake.