On the geometric flow of kirchhoff elastic rods

Chun Chi Lin*, Hartmut R. Schwetlick


研究成果: 雜誌貢獻期刊論文同行評審

15 引文 斯高帕斯(Scopus)


Recently, rod theory has been applied to the mathematical modeling of bacterial fibers and biopolymers (e.g., DNA) to study their mechanical properties and shapes (e.g., supercoiling). In static rod theory, an elastic rod in equilibrium is the critical point of an elastic energy. This induces a natural question of how to find elasticae. In this paper, we focus on how to find the critical points by means of gradient flows. We relate a geometric function of curves to the Isotropic Kirchhoff elastic energy of rods so that the generalized elastic curves are the centerlines of elastic rods in equilibrium. Thus, the variational problem for rods is formulated in curve geometry. This problem turns out to be a generalization of curve-straightening flows, which induce nonlinear fourth-order evolution equations. We establish the long time existence of length-preserving gradient flow for the geometric energy. Furthermore, by studying the asymptotic behavior, we show that the limit curves are the centerlines of the Kirchhoff elastic rods in equilibrium.

頁(從 - 到)720-736
期刊SIAM Journal on Applied Mathematics
出版狀態已發佈 - 2005

ASJC Scopus subject areas

  • 應用數學


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