Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/17836
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Type: Journal article
Title: An inverse modelling technique for glass forming by gravity sagging
Author: Agnon, Y.
Stokes, Y.
Citation: European Journal of Mechanics B: Fluids, 2005; 24(3):275-287
Publisher: Gauthier-Villars/Editions Elsevier
Issue Date: 2005
ISSN: 0997-7546
1873-7390
Statement of
Responsibility: 
Y. Agnona and Y.M. Stokes
Abstract: Some optical surfaces are formed by gravity sagging of molten glass. A glass sheet supported on a ceramic former is heated; the glass becomes a very viscous fluid and sags under its own weight until the lower surface is in full contact with the former. The smooth upper free surface is the required optical surface. Its shape is dependent on the initial geometry and, in optical terms, differs significantly from the former shape. The inverse problem is to determine the shape of the former that produces a prescribed upper surface. This is a difficult, nonlinear problem. A finite element algorithm has been developed to compute gravity sagging for any given initial axisymmetric geometry (the forward problem). The present work describes a successful iterative method, which uses the output from a number of forward problems to determine the required (axisymmetric) former shape.
Keywords: Inverse problem
Creeping flow
Free surface
Glass forming
Description: Copyright © 2004 Elsevier
DOI: 10.1016/j.euromechflu.2004.10.002
Description (link): http://www.elsevier.com/wps/find/journaldescription.cws_home/600738/description#description
Appears in Collections:Applied Mathematics publications
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