Journal
ENVIRONMENTAL MODELLING & SOFTWARE
Volume 160, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envsoft.2022.105583
Keywords
CFD; Atmospheric boundary layer; RANS; Improved SST k-? model
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This paper proposes a framework based on the Shear Stress Transport (SST) k-! turbulence model for simulating the Atmospheric Boundary Layer (ABL) in environmental studies. The model is implemented in the open-source OpenFOAM code and shows satisfactory performance.
The use of Computational Fluid Dynamics (CFD) for environmental studies is continuously growing. In this context, simulations are usually carried out solving Reynolds-averaged Navier-Stokes (RANS) equations that require an appropriate implementation of the Atmospheric Boundary Layer (ABL).This paper proposes a framework based on the Shear Stress Transport (SST) k-! turbulence model, which is highly recommended for microclimate analysis, since it is known to well reproduce homogeneous ABL flows in the context of RANS simulations. Besides, a new blending approach is developed to account for the presence of obstacles in the domain. The model is implemented in the open-source OpenFOAM code and validated against well-known benchmark cases spanning different configurations, i.e., an empty fetch, a single building and an array of buildings.The performance of the proposed model is very satisfactory. For instance, the Factor-of-2 validation metric is FAC2>0.8 for both velocity and turbulent kinetic energy in nearly all cases.
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