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我们都知道,速度可以做Helmholtz分解,用速度势的梯度和流函数旋度叠加的形式,求解二维粘性可压缩翼型绕流中的速度势和流函数相当于求两个泊松方程,但是需要给出边界条件,一般情况下,在速度场已知的情况下,即涡量场和胀量场已知,该如何分别给速度势和流函数的物面和远场边界条件?