Assessing the Horizontal Homogeneity of the Atmospheric Boundary Layer (HHABL) Profile Using Different CFD Software

Journal article

Abohela, I, Aristodemou, E, Hadawey, A and Sundararajan, R (2020). Assessing the Horizontal Homogeneity of the Atmospheric Boundary Layer (HHABL) Profile Using Different CFD Software. Atmosphere. 11 (10), pp. 1138-1138. https://doi.org/10.3390/atmos11101138
AuthorsAbohela, I, Aristodemou, E, Hadawey, A and Sundararajan, R
Abstract

One of the main factors affecting the reliability of computational fluid dynamics (CFD) simulations for the urban environment is the Horizontal Homogeneity of the Atmospheric Boundary Layer (HHABL) profile—meaning the vertical profiles of the mean streamwise velocity, the turbulent kinetic energy, and dissipation rate are maintained throughout the streamwise direction of the computational domain. This paper investigates the preservation of the HHABL profile using three different commercial CFD codes—the ANSYS Fluent, the ANSYS CFD, and the Siemens STAR-CCM+ software. Three different cases were considered, identified by their different inlet conditions for the inlet velocity, turbulent kinetic energy, and dissipation rate profiles. Simulations were carried out using the RANS k-ε turbulence model. Slight variations in the eddy viscosity models, as well as in the wall boundary conditions, were identified in the different software, with the standard wall function with roughness being implemented in the Fluent applications, the scalable wall function with roughness in the CFX applications, and the blended wall function option in the STAR-CCM+ simulations. There was a slight difference in the meshing approach in the three different software, with a prism-layer option in the STAR-CCM+ software, which allowed a finer mesh near the wall/ground boundary. The results show all three software are able to preserve the horizontal homogeneity of the ABL—less than 0.5% difference between the software—indicating very similar degrees of accuracy.

KeywordsCFD; ANSYS Fluent; Siemens STAR-CCM+; horizontal homogeneity; atmospheric boundary layer
Year2020
JournalAtmosphere
Journal citation11 (10), pp. 1138-1138
PublisherMDPI
ISSN2073-4433
Digital Object Identifier (DOI)https://doi.org/10.3390/atmos11101138
Publication dates
Online21 Oct 2020
Publication process dates
Accepted09 Oct 2020
Deposited27 Oct 2020
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Open
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