Generally, there are two methods in water current analysis and calculation, one is the Euler method, and the other is the Lagrange method.
在水流分析计算中，通常采用二种方法：一种是欧拉法；一种是拉格朗日法。
The ALE(Arbitrary Lagrange Euler) kinematic description is introduced into the finite element fractional step method.
采用ALE （任意的拉格朗日欧拉）运动学描述跟踪自由液面；
This method combines the features of Lagrange method, Newton - Euler method and screw theory, and is easy to solve.
此方法融合了拉格朗日，牛顿—欧拉法以及旋量的特点，易于求解。
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