An all-scale, finite-volume module for the IFS
Smolarkiewicz, Piotr ; Deconinck, Willem ; Hamrud, Mats ; Kühnlein, Christian ; Mozdzynski, George ; Szmelter, Joanna ; Wedi, Nils
ECMWF hosts the European Research Council-funded project PantaRhei, which explores novel numerical methods to complement existing, highly optimised numerical weather prediction (NWP) models. The need for such innovation stems from the fact that state-of-the-art global NWP models using the spectral transform method may become computationally inefficient at very fine resolutions due to the communication overhead associated with global spectral transformations. As a first step, we have developed an autonomous, all-scale numerical module which uses the finite-volume method (Box A) to supplement ECMWF’s Integrated Forecasting System (IFS). This module is compatible with emerging energy-efficient, heterogeneous hardware for highperformance computing (HPC), and it is able to represent elements of real weather on a large range of scales, including cloud-resolving scales.
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