Wellposedness, spectral analysis and asymptotic stability of a multilayered heat -wave -wave system

JOURNAL OF DIFFERENTIAL EQUATIONS

卷:269

Article

Avalos, George¹  Geredeli, Pelin G.²  Muha, Boris³ 

[1] Univ Nebraska, Dept Math, Lincoln, NE 68583 USA

[2] Iowa State Univ, Dept Math, Ames, IA USA

[3] Univ Zagreb, Fac Sci, Dept Math, Zagreb, Croatia

关键词: Fluid-structure interaction;    Heat-wave system;    Well-posedness;    Semigroup;    Strong stability;   

DOI  :  10.1016/j.jde.2020.05.035

来源: Elsevier

【 摘 要 】

In this work we consider a multilayered heat-wave system where a 3-D heat equation is coupled with a 3- D wave equation via a 2-D interface whose dynamics is described by a 2-D wave equation. This system can be viewed as a simplification of a certain fluid-structure interaction (FSI) PDE model where the structure is of composite-type; namely it consists of a thin layer and a thick layer. We associate the wellposedness of the system with a strongly continuous semigroup and establish its asymptotic decay. Our first result is semigroup well-posedness for the (FSI) PDE dynamics. Utilizing here a Lumer-Phillips approach, we show that the fluid-structure system generates a C-0-semigroup on a chosen finite energy space of data. As our second result, we prove that the solution to the (FSI) dynamics generated by the C-0-semigroup tends asymptotically to the zero state for all initial data. That is, the semigroup of the (FSI) system is strongly stable. For this stability work, we analyze the spectrum of the generator A and show that the spectrum of A does not intersect the imaginary axis. (c) 2020 Elsevier Inc. All rights reserved.

【 授权许可】

Free