NDLI: Numerical Study of Flow Dynamics in Human Eye Vitreous Chamber After Vitrectomy and Gas Tamponade

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Yousefi, Ali Abouali, Omid Rad, Ebrahim Ghoshtasbi Ahmadi, Goodarz
Copyright Year	2015
Abstract	The purpose of this study is to evaluate the flow pattern and the fluid shear stress acting on the retinal wall in a human eye vitreous chamber after Vitrectomy and gas tamponade including the effect of saccadic eye movements. The correlation between the maximum shear stress induced on the retinal wall and the gas fill fraction (GF) and saccade amplitudes was investigated. In modeling the geometry of vitreous chamber cavity, the indentation of the lens was taken into account. The two-phase flow at the recovery phase of the operation was modeled numerically. Unsteady three-dimensional forms of continuity and Navier-Stokes equations were solved. Volume-of-fluid method was used to solve the two-phase flow in the eye. Saccadic motion of the eye was modeled using the dynamic mesh technique. The numerical model was validated by comparing the results with the available analytical solutions and experimental data for a spherical model. Then, numerical simulation was performed based on the deformed sphere configuration, representing a more realistic model of vitreous chamber cavity. The simulation results were compared with the available numerical studies for the spherical geometry. Then the wall shear stress on the retina was computed and compared for various gas fractions. The potential effect of wall shear stress on the retinal detachment and the need for post-operation posturing in all studied cases were discussed.
Sponsorship	Fluids Engineering Division
File Format	PDF
ISBN	9780791857229
DOI	10.1115/AJKFluids2015-26372
Volume Number	Volume 2: Fora
Conference Proceedings	ASME/JSME/KSME 2015 Joint Fluids Engineering Conference
Language	English
Publisher Date	2015-07-26
Publisher Place	Seoul, South Korea
Access Restriction	Subscribed
Subject Keyword	Geometry Cavities Fluids Navier-stokes equations Simulation results Computer simulation Two-phase flow Lenses (optics) Shear stress Human eye Flow (dynamics) Modeling
Content Type	Text
Resource Type	Article

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