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##### Functions for non-rotating models
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@inline fᶠᶠᵃ(i, j, k, grid, ::Nothing) = zero(grid)

@inline x_f_cross_U(i, j, k, grid::AbstractGrid{FT}, ::Nothing, U) where FT = zero(FT)
@inline y_f_cross_U(i, j, k, grid::AbstractGrid{FT}, ::Nothing, U) where FT = zero(FT)
@inline z_f_cross_U(i, j, k, grid::AbstractGrid{FT}, ::Nothing, U) where FT = zero(FT)
