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December  2006, 1(4): 537-568. doi: 10.3934/nhm.2006.1.537

Periodic traveling waves in a two-dimensional cylinder with saw-toothed boundary and their homogenization limit

Hiroshi Matano 1, , Ken-Ichi Nakamura 2, and  Bendong Lou 3,

1. 

Graduate school of Mathematical Sciences, University of Tokyo, Komaba 3-8-1, Tokyo 153-8914, Japan
2. 

Department of Computer Science, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
3. 

Department of Mathematics, Tongji University, Siping Road 1239, Shanghai, China

Received  September 2006 Published  October 2006

We study a curvature-dependent motion of plane curves in a two-dimensional cylinder with periodically undulating boundary. The law of motion is given by $V=\kappa + A$, where $V$ is the normal velocity of the curve, $\kappa$ is the curvature, and $A$ is a positive constant. We first establish a necessary and sufficient condition for the existence of periodic traveling waves, then we study how the average speed of the periodic traveling wave depends on the geometry of the domain boundary. More specifically, we consider the homogenization problem as the period of the boundary undulation, denoted by $\epsilon$, tends to zero, and determine the homogenization limit of the average speed of periodic traveling waves. Quite surprisingly, this homogenized speed depends only on the maximum opening angle of the domain boundary and no other geometrical features are relevant. Our analysis also shows that, for any small $\epsilon>0$, the average speed of the traveling wave is smaller than $A$, the speed of the planar front. This implies that boundary undulation always lowers the speed of traveling waves, at least when the bumps are small enough.
Keywords: front propagation, periodic traveling wave, homogenization., curve-shortening.
Mathematics Subject Classification: Primary: 35B27, 53C44; Secondary: 35B40, 35K5.
Citation: Hiroshi Matano, Ken-Ichi Nakamura, Bendong Lou. Periodic traveling waves in a two-dimensional cylinder with saw-toothed boundary and their homogenization limit. Networks and Heterogeneous Media, 2006, 1 (4) : 537-568. doi: 10.3934/nhm.2006.1.537
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