流体质点速度为: (a, b,C, 6, c (a, b, c, t) at 流体质点加速度为 ax(a, b Ovy aya, b, c, 1) b, c 2021/2/222021/2/22 3 流体质点速度为: 流体质点加速度为: ( ) ( ) ( ) = = = t z a b c t v t y a b c t v t x a b c t v z y x , , , , , , , , , ( ) ( ) ( ) = = = = = = 2 2 2 2 2 2 t z a b c t t v a t y a b c t t v a t x a b c t t v a z z y y x x , , , , , , , ,