最简单的方法是使用一个六边形网格，然后将之扰乱使它看起来不规则。

The simplest approach would be to use a hexagonal grid and perturb it a bit to make it look irregular.

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本文提出平面上拉普拉斯算子在一类平行六边形网格上的成对4点差分格式。

In this paper we propose so-called coupled 4-point difference schemes for the Laplacian operator over a class of parallel hexagon partitions of the plane.

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这种方法基于任意几何形状网格的抽样定理，利用六边形网格来实现空间离散化。

In the H-FDTD method, Hegxagon grid is used for the spatial discretization by virtue of peridodical sampling theorem based on arbitrary geometry.

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