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ID 31669
本文ファイル
別タイトル
反応拡散系における分岐現象の数値シミュレーション
著者
高石 武史
キーワード
reaction-diffusion system
crack growth
phase field model
Turing pattern
diffusive coupling
numerical simulation
NDC
数学
抄録(英)
The bifurcation structures of two types of reaction diffusion systems are investigated.

A phase field model for anti-plane shear crack growth in two dimensional isotropic elastic material is proposed. A phase field to represent the shape of the crack with a regularization parameter ε > 0 is introduced. The phase field model is derived as a gradient flow of this regularized energy that is approximated by the Francfort-Marigo type energy using the idea of Ambrosio and Tortorelli. Several numerical examples of the crack growth computed with an adaptive mesh finite element method are presented.

A simplified coupled reaction-diffusion system is derived from a diffusive membrane coupling of two reaction-diffusion systems of activator-inhibitor type. It is shown that the dynamics of the original decoupled systems persists for weak coupling, while new coupled stationary patterns of alternated type emerge at a critical strength of coupling and these become stable for strong coupling independently of the dynamics of the decoupled systems. The approach which is used here is singular perturbation techniques and complementarily numerical methods.

In this Thesis, the usefulness of the combination of the mathematical modeling and the numerical simulation for investigating the bifurcation phenomena on the nonlinear pattern formation in reaction diffusion system is found.
言語
英語
NII資源タイプ
学位論文
広大資料タイプ
学位論文
DCMIタイプ
text
フォーマット
application/pdf
権利情報
Copyright(c) by Author
関連情報(references)
(1) Phase Field Model for Mode III Crack Growth in Two Dimensional Elasticity, T. Takaishi and M. Kimura, Kybernetika 45(4) (2009), 605-614.
(2) Pattern Formation in Coupled Reaction-Diffusion System, T. Takaishi, M. Mimura and Y.Nishiura, Japan Journal of Industrial and Applied Mathematics 12(3) (1995) 385-424.
関連情報URL(references)
http://www.kybernetika.cz/content/2009/4/605
http://dx.doi.org/10.1007/BF03167236
学位記番号
乙第4110号
授与大学
広島大学(Hiroshima University)
学位名
博士(理学)
学位名の英名
Physical Science
学位の種類の英名
doctoral
学位授与年月日
2010-03-08
部局名
理学研究科