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Numerical Comparison between Turbulent Models in Flow past Two Buildings of Different Heights

Journal Name:

  • International Journal of Science and Engineering Investigations

Publication Year:

  • 2016

Key Words:

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
The states in the flow regime past two circular buildings, tall- short and short- tall in tandem arrangement (TSA and STA of H/h=3) are investigated. The effect of building gap (L/D=1.5, 2, 2.5 and 3), diameter ratios (0.5≤B≤3) and different turbulent models (k- ε, k- ε (RNG) and LES) at Reynolds number (200≤Re≤3000) are taken into consideration. A plane of Z/H= 0.05 is taken to get the details of flow in all study cases. The results demonstrate that the k- ε (RNG) turbulent model is more suitable for these applications than the other turbulent models. Also there are notable changes to the response of the flow as result of variation of buildings separation and the vortex structures at Re=3000 are much stronger as compared to those at Re=200 according to the variation of Strouhal number (St) with Re, also the positive drag coefficient increases as the diameter ratio increases and more higher for the short building (either front or rear) than the tall one. The gap L/D=2.5 is found to be critical for all turbulent models due to abrupt changes in flow characteristics. At some gap values the downstream buildings have higher values of average drag coefficients as compared to upstream one.
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