Effects of turbulence on the mean pressure field in the separated-reattaching flow above a low-rise building

Abstract

Link to publication on Research at Birmingham portal General rights Unless a licence is specified above, all rights (including copyright and moral rights) in this document are retained by the authors and/or the copyright holders. The express permission of the copyright holder must be obtained for any use of this material other than for purposes permitted by law. • Users may freely distribute the URL that is used to identify this publication. • Users may download and/or print one copy of the publication from the University of Birmingham research portal for the purpose of private study or non-commercial research. • User may use extracts from the document in line with the concept of 'fair dealing' under the Copyright, Designs and Patents Act 1988 (?) • Users may not further distribute the material nor use it for the purposes of commercial gain. Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

Turbulence structure and similarity in the separated flow above a low building in the atmospheric boundary layer

“…Figure 2 shows the vertical distributions of turbulence intensities for upstream conditions considered in this experiment measured at the location of the building model, but with the building removed. These boundary layers are identical to those reported by Akon & Kopp (2016) and Wu et al (2017), where many further experimental details, including the mean velocity profiles, can be found.…”

“…Thus, there is a factor of two change in both intensity and scale in these data. Velocity spectra can be found in Wu et al (2017). Further details of the experimental set-up can be found in Akon & Kopp (2016), Wu et al (2017), and Akon (2017).…”

“…Velocity spectra can be found in Wu et al (2017). Further details of the experimental set-up can be found in Akon & Kopp (2016), Wu et al (2017), and Akon (2017). In order to capture the velocity fields in and around the separation bubble on the roof surface, Time-Resolved Particle Image Velocimetry (TR-PIV) was used.…”

“…The spatial uncertainty of standard cross-correlation algorithms is approximately 0.1 pixels (Huang et al, 1997). Wu et al (2017) provide comparisons of the PIV measurements with four-hole Cobra pressure probe measurements (TFI, Inc. model no. 900) in the wind tunnel at the position of the building model, but with the building removed, that indicate good agreement between the two measurement systems.…”

“…As observed by Akon and Kopp (2016), higher turbulence levels lead to relatively longer recovery distances for the for the surface pressures following separation. Wu et al (2017) found that the "pressure recovery rates [in the separation bubble] are mainly due to increased turbulence-contributed pressure gradients near the roof surface" and that the "rate of recovery is not sufficiently high" to ensure a self-similar pressure distribution.…”