Numerical Analysis of Thermally Coupled Flow Problems with Interfaces and Phase-change Effects |
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Authors: | Marcela Cruchaga Diego Celentano |
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Institution: | Departamento de Ingeniería Mecánica , Universidad de Santiago de Chile , Av. Bdo. O'Higgins, Santiago, 3363, Chile |
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Abstract: | In this work a fixed mesh finite element approach is presented to solve thermally coupled flow problems including moving interfaces between immiscible fluids and phase-change effects. The weak form of the full incompressible Navier-Stokes equations is obtained using a generalized streamline operator (GSO) technique that enables the use of equal order interpolation of the primitive variables of the problem: velocity, pressure and temperature. The interfaces are defined with a mesh of marker points whose motion is obtained applying a Lagrangian scheme. Moreover, a temperature-based formulation is considered to describe the phase-change phenomena. The proposed methodology is used in the analysis of a filling of a step mould and a gravity-driven flow of an aluminium alloy in an obstructed vertical channel. |
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Keywords: | Thermally Coupled Incompressible Flows Interface Problems Phase-change Effects Moving Lagrangian Interface Technique |
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