亥姆霍兹定理 (流体力学)
亥姆霍兹定理(英语:Helmholtz's theorems)是流体力学中关于涡旋动力学性质的三条定理,以德国物理学家赫尔曼·冯·亥姆霍兹的名字命名。
亥姆霍兹定理适用于有势体积力作用下的无粘性、正压流体,其表述分别为:
- 亥姆霍兹第一定理:涡线的强度沿涡线保持不变。
- 亥姆霍兹第二定理:涡线在流体中不会自行产生或消失,只能首尾相接、沿伸至无穷远处或终止于边界处。
- 亥姆霍兹第三定理:无外力影响下,无旋流动始终保持无旋。
参见
参考文献
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- P. G. Saffman, Vortex Dynamics, Cambridge University Press, 1995, ISBN 0-521-42058-X
- G. K. Batchelor, An Introduction to Fluid Dynamics, Cambridge University Press (1967, reprinted in 2000).
- Kundu, P and Cohen, I, Fluid Mechanics, 2nd edition, Academic Press 2002.
- George B. Arfken and Hans J. Weber, Mathematical Methods for Physicists, 4th edition, Academic Press: San Diego (1995) pp. 92–93
- A.M. Kuethe and J.D. Schetzer (1959), Foundations of Aerodynamics, 2nd edition. John Wiley & Sons, Inc. New York ISBN 0-471-50952-3