The mathematical expression of this model is a second order non linear ordinary difference equation.
该模型的数学形式是一个非线性二阶常微分方程，利用有限差分方法进行求解。
The fully potential equation is chosen as the mathematical model.
选用全势方程作为数学模型。
The accurate velocity potential equation is chosen as a mathematical model of the problem.
选用精确速势方程作为问题的数学模型。
The accurate velocity potential equation is chosen as a mathematical model of the problem.
选用精确速势方程作为问题的数学模型。
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