A NUMERICAL STUDY OF UNSTEADY, THERMAL, GLASS FIBER DRAWING PROCESSES ∗

Abstract

Abstract. An efficient second-order stable numerical method is presented to solve the model partial differential equations of thermal glass fiber processing. The physical process and structure of the model equations are described first. The numerical issues are then clarified. The heart of our method is a MacCormack scheme with flux limiting. The numerical method is validated on a linearized isothermal model and by comparison with known exact stationary solutions. The numerical method is then generalized to solve the equations of motion of thermal glass fiber drawing, exhibiting order of convergence. Further, the nonlinear PDE scheme is benchmarked against an independent linearized stability analysis of boundary value solutions near the onset of instability, which demonstrates the efficiency of the method. Key words. MacCormack scheme, flux limiting, thermal glass fiber drawing. MSC 2000 subject classifications. 35M99, 35Q35, 65N06. 1

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