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Nonexistence of Lyapunov functions and the instability of the von Ka´rma´n vortex streets

 

作者: Chjan Lim,  

 

期刊: Physics of Fluids A  (AIP Available online 1993)
卷期: Volume 5, issue 9  

页码: 2229-2233

 

ISSN:0899-8213

 

年代: 1993

 

DOI:10.1063/1.858560

 

出版商: AIP

 

数据来源: AIP

 

摘要:

The instability of the von Ka´rma´n vortex streets and the existence of a global Lyapunov function at the special aspect ratioh/l=(1/&pgr;)sinh−1(1), are some of the difficulties with the well‐known von Ka´rma´n model. By consistently applying the principle of genericity, its shown that a new family of near‐equilibrium periodic solutions of the von Ka´rma´n model for aspect ratios near 0.281... supplies numerous theoretical candidates for observed vortex trails. This set of solutions implies that there is no global Lyapunov functions whenh/l≠(1/&pgr;)sinh−1(1) which in turn leads to a rich variety of near‐equilibrium solutions for the model.

 

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