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

CFD investigation of the atmospheric boundary layer under different thermal stability conditions

“…The realisable k-ε turbulence model provided the best prediction of the turbulent kinetic energy distributions, but this is attributed to the downstream profiles. These results are similar to those found by Balogh et al (2012) using FLUENT and OpenFOAM. They found that the results could be marginally improved, particularly for the prediction of the turbulent kinetic energy distributions, by modifying the wall treatments to be consistent with the velocity and turbulence inlet profiles in OpenFOAM (Balogh et al 2012).…”

“…These results are similar to those found by Balogh et al (2012) using FLUENT and OpenFOAM. They found that the results could be marginally improved, particularly for the prediction of the turbulent kinetic energy distributions, by modifying the wall treatments to be consistent with the velocity and turbulence inlet profiles in OpenFOAM (Balogh et al 2012). This kind of wall treatment, however, is not available to users of STAR-CCM+, and its implementation is made difficult as access to the source-code is unavailable.…”

“…The manipulation of the code in commercial CFD packages like FLUENT or STAR-CCM+ to make these kinds of modifications is not straightforward and is much more easily implemented in open-source software like OpenFOAM (Balogh et al 2012). The reason is that commercial codes do not …”

Roof region dependent wind potential assessment with different RANS turbulence models

“…Regarding the linear system solvers, generalised geometric-algebraic multi-grid solver (GAMG) with DIC smoother is used for the pressure, and preconditioned bi-conjugate gradient solver for asymmetric matrices (PBiCG) with diagonal incomplete (Lu and Ip, 2009) (DILU) preconditioner is used for the rest of variables. Second order accurate numerical schemes (both central differencing and upwind) must be used at least in order to avoid problems with false diffusion (Rakai et al, 2014;Balogh et al, 2012;Bakker, 2015;ANSYS Fluent, 2015). Regarding the mesh, the external domain (inlet, outlet, ground, sky and sides in Fig.…”

CFD simulation of wind flow over natural complex terrain: Case study with validation by field measurements for Ria de Ferrol, Galicia, Spain

“…In fact, the CFD simulations did predict the flow separation in the lee of the hill, albeit with some discrepancies. Later 3D steady RANS simulations for the Askervein hill were made by -among others - Kim et al (2000), Prospathopoulos and Voutsinas (2006), Undheim et al (2006), Balogh et al (2012) and Moreira et al (2012), while both steady and unsteady RANS simulations were made by Castro et al (2003), hybrid RANS/LES by Bechmann and Sorensen (2010) and LES simulations by Silva Lopes et al (2007).…”