Keywords: metamodelling, urbanisation, mesoscale models, microscale models, two–way coupling, urban simulation, flow modelling, dispersion modelling, air pollution, air quality, Greece, Athens
A metamodelling implementation of a two–way coupled mesoscale–microscale flow model for urban area simulations
Systems of coupled prognostic mesoscale and microscale models have been suggested as a tool to accurately simulate flows around artificial structures and over densely built urban areas. Implementations of such two–way coupling are burdened by scale mismatches as well as the formidable computational cost of online microscale calculations. A simplifying approach is proposed, where microscale feedbacks are spatially and temporally upscaled and assimilated into the mesoscale calculation. A two–way coupled model system is developed, consisting of the mesoscale model MEMO and the microscale model MIMO, employing interpolating metamodels. As an illustrative application, multi–day simulations for Athens, Greece are presented.