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本文用“单向”(one—way)方法进行正压原始方程套网格试验。粗、细网格均采用空间分解准拉格朗日格式和由廖洞贤等提出的与此差分格式一致的内边界条件(即方案二)。试验结果表明,用方案二作出的24小时细网格预报,与按半动量格式和粗网格直接给细网格提供内边界条件(即方案一)所得的结果相比,去除了在流出处出现的不稳定,系统的流入、流出也较好。这两种方案再加上Davies“松弛区域”的方法(分别为方案四,方案三),其结果与上述类似,且方案四比方案二还要好些。
In this paper, the “one-way” method is used to test the positive pressure shell equations. The coarse and fine grids adopt the space decomposition of the quasi-Lagrangian format and the internal boundary conditions proposed by Liao et al., In line with this difference format (ie scheme 2). The experimental results show that the 24-hour fine mesh forecast made by the second scheme is less than that obtained by providing the inner boundary conditions (ie, the first scheme) directly to the fine mesh in the semi-momentum format and the coarse mesh, The emergence of instability, the inflow of the system, outflow is better. These two schemes combined with Davies “relaxation zone” approach (Scheme 4, Scheme 3, respectively) have similar results to those described above, and scheme 4 is better than scheme 2.