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Research Article

Dynamic sub-grid scale turbulent Schmidt number approach in large eddy simulation of dispersion around an isolated cubical building

Mohammad Jadidi, Farzad Bazdidi-Tehrani( ), Mohsen Kiamansouri
School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran
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Abstract

In this paper, the effects of the sub-grid scale (SGS) turbulent Schmidt number, ScSGS, on the large eddy simulation of dispersion on and around an isolated cubical model building with a flush vent located on its roof are examined. Constant and dynamic ScSGS approaches for SGS turbulent mass flux modeling are employed. Simulation results are compared with the available wind tunnel measurements. Furthermore, the influence of the grid resolution on the accuracy of results predicted by the dynamic ScSGS approach is investigated. Detailed statistical analysis of ScSGS demonstrates that the dynamically computed ScSGS at different locations varies by a factor of almost 5 and a considerable deviation of ScSGS from its common values of 0.5 and 0.7 occurs. Particularly, in the vicinity of the building where the concentration gradients are noticeable, ScSGS has a larger variation. Also, the probability of occurrence of 0.2 < ScSGS <1.5 is more than 90 percent and the ScSGS mean values are nearly around 0.8 to 1 with a maximum variance of 0.2. In addition, by refining the grid, the differences between the predictions of constant and dynamic ScSGS approaches decrease. This is due to the reduction of sub-grid scales contribution to turbulent dispersion. It is confirmed that dynamic ScSGS approach is a practical alternative to the constant ScSGS approach, effectively eliminating a user-defined model coefficient.

Keywords

dispersionlarge eddy simulationsub-grid scale turbulent Schmidt numberdynamic ScSGS approachgrid resolutioncubical building

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Building Simulation
Volume 9 Issue 2,
April 2016
Pages 183-200
DOI: 10.1007/s12273-015-0257-0
Cite this article:
Jadidi M, Bazdidi-Tehrani F, Kiamansouri M. Dynamic sub-grid scale turbulent Schmidt number approach in large eddy simulation of dispersion around an isolated cubical building. Building Simulation, 2016, 9(2): 183-200. https://doi.org/10.1007/s12273-015-0257-0

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Received: 09 May 2015
Revised: 20 September 2015
Accepted: 08 October 2015
Published: 23 October 2015
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2015
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