期刊
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
卷 394, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cma.2022.114863
关键词
Viscothermal acoustics; Sequential linearized Navier-Stokes model; Topology optimization; Level set method; Sound-absorbing structure; Topological derivative
资金
- Kawai Foundation for Sound Technology Music, Japan
This study proposes a level set-based topology optimization method for designing acoustic structures with viscous and thermal boundary layers. By introducing a sequential linearized Navier-Stokes model, the viscothermal effects can be estimated, and the design sensitivity is obtained using the adjoint variable method and the concept of the topological derivative. The results of the study demonstrate the effectiveness of the proposed method.
This study proposes a level set-based topology optimization method for designing acoustic structures with viscous and thermal boundary layers in perspective. Acoustic waves propagating in a narrow channel are damped by viscous and thermal boundary layers. To estimate these viscothermal effects, we first introduce a sequential linearized Navier-Stokes model based on three weakly coupled Helmholtz equations for viscous, thermal, and acoustic pressure fields. Then, the optimization problem is formulated, where a sound-absorbing structure comprising air and an isothermal rigid medium is targeted, and its sound absorption coefficient is set as an objective function. The adjoint variable method and the concept of the topological derivative are used to approximately obtain design sensitivity. A level set-based topology optimization method is used to solve the optimization problem. Two-dimensional numerical examples are provided to support the validity of the proposed method. Moreover, the mechanisms that lead to the high absorption coefficient of the optimized design are discussed. (C) 2022 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据