Hydrodynamic modeling of cochlea and numerical simulation for cochlear traveling wave with consideration of fluid-structure interaction  

作　　者：任柳杰 华诚 丁光宏 杨琳 戴培东 张天宇 

机构地区：[1]Department of Mechanics and Engineering Science, Fudan University [2]Research Center, Eye and ENT Hospital of Fudan University

出　　处：《Journal of Hydrodynamics》2013年第2期167-173,共7页水动力学研究与进展B辑（英文版）

基　　金：supported by the Shanghai Committee of Science and Technology of China(Grant No.10ZR1403500,10ZR1405800);the National Basic Research Development Program of China(973Program,Grant No.2012CB518502);the National Natural Science Foundation of China(Grant No.30971528).

摘　　要：The cochlea is an important structure in the hearing system of humanity. Its unique structure enables the sensibility to the sound waves of varied frequencies. The widely accepted model of the cochlea is expressed as a long tube longitudinally divided by a membrane named the Basilar Membrane （BM）, into two fluid-filled channels. Based on various assumptions for the cochlear fluid and structure, simplified mathematical and mechanical cochlear models were developed to help to understand the mechanism of the complex coupled system in the past decades. This paper proposes a hydrodynamic numerical cochlear model with consideration of the Fluid-Structure Interaction （FSI）. In this model, the cochlear lymph is considered as in a Newtonian viscous fluid, and the basilar membrane is modeled as a composite structure. The traveling wave is simulated. Also focusing on the pressure in the fluid field, the results are compared with studies of Peterson and Bogert, where it was assumed that the slow compressive waves are traveling along the BM. Furthermore, the transmitting time of the cochlear traveling wave is also discussed.The cochlea is an important structure in the hearing system of humanity. Its unique structure enables the sensibility to the sound waves of varied frequencies. The widely accepted model of the cochlea is expressed as a long tube longitudinally divided by a membrane named the Basilar Membrane （BM）, into two fluid-filled channels. Based on various assumptions for the cochlear fluid and structure, simplified mathematical and mechanical cochlear models were developed to help to understand the mechanism of the complex coupled system in the past decades. This paper proposes a hydrodynamic numerical cochlear model with consideration of the Fluid-Structure Interaction （FSI）. In this model, the cochlear lymph is considered as in a Newtonian viscous fluid, and the basilar membrane is modeled as a composite structure. The traveling wave is simulated. Also focusing on the pressure in the fluid field, the results are compared with studies of Peterson and Bogert, where it was assumed that the slow compressive waves are traveling along the BM. Furthermore, the transmitting time of the cochlear traveling wave is also discussed.

关 键 词：COCHLEA traveling wave finite-element method Fluid Structure Interaction （FSI） 

分 类 号：O35[理学—流体力学]