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The mean force is the time average of the above expression and the first order term becomes zero. The pressure includes the non-linear term in the Bernoulli equation and therefore will not disappear.

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Components at both difference and sum frequencies¡£Each with real and imaginary parts

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Pij(?)???14?g?i.?jcos(?i??j)ndlWLWaterlineintegralBernoulliAcceleration???14???i.??jndSS0???12?(Xi.?S0??j?t)ndS?Ms.Ri.Xgj??(2)?????.n.dS?tS0..Momentum2nd order potential½á¹¹ÔÚ²¨ÀËÖеÄÏìÓ¦XÊÇͨ¹ý¼ÆËãÏÂÃæ·½³ÌµÃµ½:

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