Breakdown of the Whitham Modulation Theory and the Emergence of Dispersion
Breakdown of the Whitham Modulation Theory and the Emergence of Dispersion
复制标题
惠特姆调制理论的崩溃和色散的出现
DOI:
10.1111/sapm.12086
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发表时间:
2015
影响因子:
2.7
通讯作者:
Bridges T
中科院分区:
文献类型:
--
作者:
Bridges T
The Whitham modulation theory for periodic traveling waves of PDEs generated by a Lagrangian produces first‐order dispersionless PDEs that are, generically, either hyperbolic or elliptic. In this paper, degeneracy of the Whitham equations is considered where one of the characteristic speeds is zero. In this case, the Whitham equations are no longer valid. Reformulation and rescaling show that conservation of wave action morphs into the Korteweg–de Vries (KdV) equation on a longer time scale thereby generating dispersion in the Whitham modulation equations even for finite amplitude waves.
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