Large eddy simulation of atmospheric boundary layer flow over complex terrain in comparison with RANS simulation and on-site measurements under neutral stability condition

Large eddy simulation (LES) of the atmospheric boundary layer (ABL) flow over complex terrain is presented with a validation using meteorological tower (met-tower) data through an improved neutral stability sampling approach. The proposed procedure includes condition based on most-likely occurrence time-periods ABL and reduces variabilities conditional wind statistics calculated at met-towers in comparison to our previous work. simulations are carried out potential site prominent hill OpenFOAM-based simulator for on/off-shore farm applications by applying Lagrangian-averaged scale-invariant dynamic sub-grid scale turbulence model. A low-dissipative scale-selective discretization scheme non-linear convection term LES governing equation adopted implicitly ensure both second-order accuracy bounded solution. inflow generated precursor method “tiling” approach driving parameters obtained from corresponding Reynolds-averaged Navier–Stokes (RANS) simulation. Overall, averaged velocity profiles predicted all met-tower locations show similar tendency as RANS results, which also reasonable agreement data. An obvious difference speed standard deviation seen between RANS, especially regions downstream edge, where shows under-predicted results highest measurement levels computational costs found be about 20 times higher than simulations.