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- W3089183775 abstract "Upwinded mass fluxes are described and analysed for advection operators discretised using mixed mimetic spectral elements. This involves a Petrov-Galerkin formulation by which the mass flux test functions are evaluated at downstream locations along velocity characteristics. As for the original mixed mimetic spectral element advection operator, the upwinded mass flux advection operator is conservative, however unlike the original advection operator, which is purely hyperbolic, the upwinded advection operator adds dissipation which is biased towards high wave numbers. The upwinded advection operator also removes the spectral gaps present in the dispersion relation for the original advection operator. As for the original advection operator, a material form advection operator may be constructed by similarly downwinding the trial functions of the tracer gradients. Both methods allow for the recovery of exact energy conservation for an incompressible flow field via skew-symmetric formulations. However these skew-symmetric formulations are once again purely hyperbolic operators which do not suppress oscillations. The scheme is implemented within a shallow water code on the sphere in order to diagnose and interpolate the potential vorticity. In the absence of other dissipation terms, it is shown to yield more coherent results for a standard test case of barotropic instability." @default.
- W3089183775 created "2020-10-01" @default.
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- W3089183775 date "2021-05-01" @default.
- W3089183775 modified "2023-09-23" @default.
- W3089183775 title "Petrov–Galerkin flux upwinding for mixed mimetic spectral elements, and its application to geophysical flow problems" @default.
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- W3089183775 doi "https://doi.org/10.1016/j.camwa.2021.02.017" @default.
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