Scale Analysis on Unstructured Grids: Kinetic Energy and Dissipation Power Spectra on Triangular Meshes

نویسندگان

چکیده

Abstract Fourier spectra are powerful tools to analyze the scale behavior of turbulent flows. While such mathematically based on regular periodic data, some state‐of‐the‐art ocean and climate models use unstructured triangular meshes. Observational data is often also available only in an fashion. In this study, analysis specifically for output with meshes discussed representable wavenumbers derived. Aside from using different interpolation methods oversampling prior computation spectra, we consider alternative Walsh–Rademacher basis, that is, indicator functions. It does not require can be extended general A third approach smoothing filters which focus grid scales discussed. We compare these context kinetic energy dissipation power a channel flow simulated sea ice‐ocean model FESOM2. One simulation uses classical viscous closure, another new backscatter closure. The latter dissipative small scales, but anti‐dissipative large leading more realistic representation. All three clearly highlight differences between simulations as concerns distribution over scales. However, transformation highly sensitive method case power, potentially inaccurate representations at This highlights necessity cautious when choosing grids.

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ژورنال

عنوان ژورنال: Journal of Advances in Modeling Earth Systems

سال: 2023

ISSN: ['1942-2466']

DOI: https://doi.org/10.1029/2022ms003280