Abstract
This chapter discusses the interaction between two parallel plates in a two-dimensional flow. The coupling of two parallel plates belongs to one of the common interface coupling problems. In this chapter, flexible filaments and flowing soap film are employed to study their coupling. A simplified model is proposed to describe the coupling problem. The dispersion relationship is obtained by a temporal linear instability analysis. Two special cases of flapping coupling, i.e. two identical filaments having the same length and two filaments having different lengths, are studied in detail. Relevant experiments are carried out in a soap film tunnel and the stable and unstable modes are observed. Comparison between theoretical predictions and experimental results is discussed in detail.
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