Atmospheric Turbulent Flow Solutions Coupled With a Mesoscale Weather Prediction Model

Abstract eng:
Atmospheric turbulent flow solutions coupled with a mesoscale meteorological weather prediction software are obtained on terrain fitted high resolution computational grids using FLUENT as a CFD tool. The terrain topology of interest, which may be obtained in various resolution levels, is accurately modeled using unstructured grids. The widely used meteorological weather prediction software WRF is used to provide unsteady boundary conditions for the CFD solution domain. Due to difference of mesh structure and resolution, the coupling procedure is challenging. As an addition to previous works, improvements over the coupling procedure are done by using modified boundary conditions to match the ground surfaces of both low resolution WRF data and FLUENT flowfield. Unsteady boundary conditions are implemented through the User Defined Functions developed for FLUENT. The main objectives of this study are to overcome the challenges of the coupling of the solvers and to obtain unsteady, turbulent atmospheric flow solutions accurately using low resolution atmospheric weather prediction models for spatially and time varying boundary conditions and high resolution Navier-Stokes solutions over topographical terrains.

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