Project Title:

Coupled Fluid-Structure Model for Improved Evaluation of Vestibular Function During In-Flight Conditions

94-1	12.01	6576		

Coupled Fluid-Structure Model for Improved Evaluation of Vestibular Function 
During In-Flight Conditions 

Abstract:

The vestibular system senses angular and linear accelerations and 
gravitational forces on the skull. The mechanics of signal transduction in 
the vestibular sensing organs are governed by complex fluid-structure 
interactions between the semicircular canal fluid (endolymph) and ampullar 
membranes (cupula), and the otoliths and endolymph in the utricle and 
saccule. These interactions have not been studied yet. 
We propose to develop a numerical fluid-structure interaction model which 
would accurately describe the mechanics of signal transduction in the 
vestibular sensing organs. The model will enable improved interpretation of 
vestibular function test data obtained during in-flight testing. It would 
also provide valuable input for numerical models of the vestibular macular 
neural network. In Phase I, the cupula-endolymph and otolith-endolymph 
interactions in the horizontal semicircular canal and utricle will be modeled 
using a simplified canal geometry. The model will be used to study the 
effects of microgravity on the vestibular peripheral function. In Phase II, 
anatomical geometry will be prescribed for the computational domain in the 
model. It will then be extended for simulating the mechanics of the entire 
vestibular system in response to any arbitrary acceleration or gravitational 
stimulus encountered in normal physiological or aerospace flight 
environments. 

The vestibular model will be useful for: (a) inflight test data 
interpretation, and (b) developing improved methods to evaluate vestibular 
function. It will be of interest to manufacturers of vestibular testing 
equipment, NASA and the Air Force. The model will also have diagnostic 
applications for inner ear disorders by enabling prediction of subtle defects 
in vestibular function and thus it will be of interest to Otologists and 
Otolaryngologists. 

Key Words

CFD Research Corporation
3325 Triana Blvd.
Huntsville, AL 35805