Journal of Hydrodynamics

, Volume 18, Issue 1, pp 300–305 | Cite as

The evolution equation for the second-order internal solitary waves in stratified fluids of finite depth

  • Youliang Cheng
  • Zhongyao Fan
Session A5


The evolution equation for the second-order internal solitary waves in stratified fluids, that are income-pressible inviscid ones of mixed stratification in which the density varies with depth in lower layer but keeps uniform in upper layer with a finite depth, is derived directly from the Euler equation by using the balance between the nonlinearity and the dispersion with the scaling μ=O(ε), and by introducing the Gardner-Morikawa transformation, asymptotic expansions and the matching of the solutions for the upper and lower layers of fluid via the computer algebraic operation. The evolution equation and its solution derived for the first-order wave amplitude are consistent with the classical ones, and the desired equation governing the second-order amplitude is reduced as follows where \(g(\xi) = - {1 \over {2\pi}}\int_{- \infty}^\infty {k\,\coth (kl){e^{jk\xi}}dk} \) and G2 (f1, c1, κ1; c0, ϕ) is the inhomogeneous term, f1 is the first-order wave amplitude.

Key words

finite depth internal solitary waves stratified fluids perturbation methods 


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Copyright information

© China Ship Scientific Research Center 2006

Authors and Affiliations

  • Youliang Cheng
    • 1
  • Zhongyao Fan
    • 1
  1. 1.Department of Power EngineeringNorth China Electric Power UniversityBaoding, HebeiChina

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