Numerical Analysis of Thermally Coupled Flow Problems with Interfaces and Phase-change Effects

Authors: Cruchaga M.; Celentano D.

Source: International Journal of Computational Fluid Dynamics, Volume 16, Number 4, 1 January 2002 , pp. 247-262(16)

Publisher: Taylor and Francis Ltd

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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.

Keywords: Thermally coupled incompressible flows; Interface problems; Phase-change effects; Moving Lagrangian interface technique

Document Type: Research article

DOI: 10.1080/1061856021000025139

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