为避免二维波方程中的大量计算，使用二维波动方程的中心差分近似来模拟流体运动。
This paper used centered difference to simulate the fluid movement in order to avoid lots of calculations in two dimension wave equation.
液压振动系统的主要特点是在桩机液压系统中的压桩油路产生流体压力变化和波动，从而使沉桩力出现高频的周期变化，产生振动压桩的效果。
The main character of the HVS is that, by means of fluctuating oil pressure, the pile-driving force can be changed in a higher frequency, and therefore better vibrating effect can be gained.
在本文中应用渐近级数来求解在非均匀流动中的两层迭加流体的波动问题。
In this paper, the asymptotic series are applied to solve problems of non-uniform flow on a two-layer fluid.
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