Seminar - Numerical simulation of acoustic waves in air and poroelastic media using the partition of unity finite element method by
Dr. Jean-Daniel Chazot
Date: 02 October 2013 (Wednesday)
Time: 11:00 am – 12:00 pm
Venue: EF305, The Hong Kong Polytechnic University
Foams and fibrous materials are used in a large range of applications such as automotive or building acoustics. Their properties can be described with either a poroelastic model or an equivalent fluid model. These models, also used in geophysics, are now widely spread and are also available in some commercial finite element software applications. However the discretization level required to achieve reasonable accuracy is not always acceptable in the mid-frequency range. In such case, the Partition of Unity Finite Element Method (PUFEM) using plane wave functions seems appropriate to avoid this limitation. The presentation will focus on the coupling between a poroelastic material, i.e. described with Biot's equations, and an air cavity. Some practical examples are tested to demonstrate the efficiency of the PUFEM for solving noise control problems at medium frequency, but also to underline the precautions that must be taken when dealing with an air-porous interface.
After his engineering studies at the National Institute of Applied Sciences in Lyon (INSA Lyon), and a year at the Ecole normale supérieure de Cachan, Jean-Daniel Chazot did his PhD at INSA Lyon on the acoustic transparency of double panels filled with granular materials. He is now working at the University of Technology of Compiègne. His main topic of research is the numerical modeling of porous materials. He is also working on the identification and characterization of viscoelatic and poroelastic materials, and on acoustic imaging.