采用求解地壳单层密度变化的一般公式，导出其平面近似公式并给出了相应的数值计算方法。
By use of the common formula for solving the time variations of the crustal density, the approximative plane formula is derived and its numerical calculation method is given.
分别应用平面近似法和积分方法推导出在散心爆轰的数值模拟中，人为粘性系数和空间步长之间的匹配关系。
The matching relation between the viscosity and the mesh size was obtained using planar approximate method and integral method in the numerical modeling of divergent detonation.
而且，特别地，如果我们令此函数为零，而不是近似为零，它意味着我们在水平集的切平面上移动。
And so, in particular, if we set this equal to zero instead of approximately zero, it means we'll actually be moving on the tangent plane to the level set.
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