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arXiv 1601.02154math.APmath-phmath.MP
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Camassa-Holm方程作为改进Boussinesq方程和一类非局部wave equations的长波极限

The Camassa-Holm equation as the long-wave limit of the improved Boussinesq equation and of a class of nonlocal wave equations

H. A. Erbay, S. Erbay, A. Erkip

摘要:

在本研究中,我们严格证明了在长波极限下,改进的Boussinesq方程所属的一类非局部波方程的单向解在长时间尺度上可以很好地近似为Camassa-Holm方程的解.这类一般的非局部波动方程模型的双向波在非局部和非线性弹性介质中的传播,其本构方程是由卷积积分。为了证明Camassa-Holm近似,我们表明,近似误差在很长一段时间内保持很小。为了更精确地,我们得到两个独立的,小的,积极的参数$ε$和$δ$测量的非线性和色散的影响,分别误差估计。我们进一步证明了类似的结论也适用于低阶近似:Benjamin-Bona-Mahony近似和Korteweg-de Vries近似。

英文摘要:

In the present study we prove rigorously that in the long-wave limit, the unidirectional solutions of a class of nonlocal wave equations to which the improved Boussinesq equation belongs are well approximated by the solutions of the Camassa-Holm equation over a long time scale. This general class of nonlocal wave equations model bidirectional wave propagation in a nonlocally and nonlinearly elastic medium whose constitutive equation is given by a convolution integral. To justify the Camassa-Holm approximation we show that approximation errors remain small over a long time interval. To be more precise, we obtain error estimates in terms of two independent, small, positive parameters $ε$ and $δ$ measuring the effect of nonlinearity and dispersion, respectively. We further show that similar conclusions are also valid for the lower order approximations: the Benjamin-Bona-Mahony approximation and the Korteweg-de Vries approximation.

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