On the RANS simulation of ABL flows

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RANS simulation of ABL flow over complex terrains applying an enhanced k-ε model and wall function formulation

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RANS simulation of ABL flow over complex terrains applying an Enhanced k-ε model and wall function formulation: Implementation and comparison for fluent and OpenFOAM

The simulation of Atmospheric Boundary Layer (ABL) flows is commonly performed using commercial CFD codes with RANS turbulence modeling, applying the standard k-ε model. However, when applied to the simulation of the homogenous ABL, this approach may result in an undesired decay of the velocity and turbulent fully-developed profiles specified at the inlet of the computational domain. This behavior is due to an inconsistency between turbulence model, inflow conditions and wall function formulation. An approach has been introduced recently to overcome this problem, which consists in the modification of the turbulence model and wall function formulation to retrieve an overall consistent treatment of the neutral ABL. Such methodology, previously applied to simulation of the atmospheric boundary layer over flat terrain and ground-mounted bluff bodies, is here applied to the simulation of the flow over complex terrains and hills, at wind tunnel and atmosphere scale. In a time of limited scientific funding, the availability of open source CFD software such as OpenFOAM is a very attractive option to investigate; therefore, a comparison between OpenFOAM and the commercial code FLUENT 13.0 has been carried out in the present paper. The potential of the proposed methodology and the satisfactory performances of OpenFOAM are demonstrated. © 2012 Elsevier Ltd.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Large eddy simulation of the atmospheric boundary layer using OpenFOAM

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Application of Principal Component Analysis to the Investigation of the Conjugate Heat transfer in Ribbed Ducts

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A Comprehensive Modelling Approach for the Neutral Atmospheric Boundary Layer: Consistent Inflow Conditions,Wall Function and Turbulence Model

We report on a novel approach for the Reynolds-averaged Navier-Stokes (RANS) modelling of the neutral atmospheric boundary layer (ABL), using the standard K-e{open} turbulence model. A new inlet condition for turbulent kinetic energy is analytically derived from the solution of the K-e{open} model transport equations, resulting in a consistent set of fully developed inlet conditions for the neutral ABL. A modification of the standard K-e{open} model is also employed to ensure consistency between the inlet conditions and the turbulence model. In particular, the turbulence model constant Cμ is generalized as a location-dependent parameter, and a source term is introduced in the transport equation for the turbulent dissipation rate. The application of the proposed methodology to cases involving obstacles in the flow is made possible through the implementation of an algorithm, which automatically switches the turbulence model formulation when going from the region where the ABL is undisturbed to the region directly affected by the building. Finally, the model is completed with a slightly modified version of the Richards and Hoxey rough-wall boundary condition. The methodology is implemented and tested in the commercial code Ansys Fluent 12.1. Results are presented for a neutral boundary layer over flat terrain and for the flow around a single building immersed in an ABL. © 2011 Springer Science+Business Media B.V.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

RANS simulation of the atmospheric boundary layer over complex terrain with a consistent k-epsilon model formulation

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RANS simulation of ABL flows: application of advanced wall boundary conditions to configurations with mixed rough and smooth surfaces

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Improved k-E model and wall function formulation for the RANS simulation of neutral ABL flows

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