Controlling the Computational Modes of the Arbitrarily Structured C Grid
Controlling the Computational Modes of the Arbitrarily Structured C Grid
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DOI：
10.1175/mwr-d-11-00221.1
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发表时间：
2012-10
影响因子：
3.2
通讯作者：
H. Weller
中科院分区：
文献类型：
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作者：
H. Weller
任意结构的C网格THUBURN-Ringler-Skamarock-Klemp(TRISK)正被用于跨尺度预报模式(MPAS)，并被英国气象局考虑作为下一个动力核心。然而，六边形C网格支持伪Rossby模的一个分支，这导致了位涡(PV)的错误的网格尺度振荡。文中展示了如何通过对PV采用迎风偏置插值法来实现对这些模式的无害控制。测试了一些现有的PV平流方案，包括在MPAS中使用的平流方案，但没有一种方案对所有网格和所有情况都能给出足够的结果。因此，提出了一种新的方案：连续的线性迎风稳定输送(CLUST)，它是中心风和线性迎风的混合体，该混合体依赖于相对于单元边缘的流动方向。事实上，一些计划是为了……
AbstractThe arbitrarily structured C grid, Thuburn–Ringler–Skamarock–Klemp (TRiSK), is being used in the Model for Prediction Across Scales (MPAS) and is being considered by the Met Office for their next dynamical core. However, the hexagonal C grid supports a branch of spurious Rossby modes, which lead to erroneous grid-scale oscillations of potential vorticity (PV). It is shown how these modes can be harmlessly controlled by using upwind-biased interpolation schemes for PV. A number of existing advection schemes for PV are tested, including that used in MPAS, and none are found to give adequate results for all grids and all cases. Therefore a new scheme is proposed; continuous, linear-upwind stabilized transport (CLUST), a blend between centered and linear-upwind with the blend dependent on the flow direction with respect to the cell edge.A diagnostic of grid-scale oscillations is proposed that gives further discrimination between schemes than using potential enstrophy alone. Indeed, some schemes are fo...