Journal
JOURNAL OF COMPUTATIONAL PHYSICS
Volume 335, Issue -, Pages 760-779Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcp.2017.01.055
Keywords
Discontinuous Galerkin method; Grad-div stabilisation; Pressure jump stabilisation; Weakly non-isothermal incompressible flow; Differentially heated square cavity; Melting of pure gallium
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This paper presents heavily grad-div and pressure jump stabilised, equal- and mixed order discontinuous Galerkin finite element methods for non -isothermal incompressible flows based on the Oberbeck-Boussinesq approximation. In this framework, the enthalpy porosity model for multiphase flow in melting and solidification problems can be employed. By considering the differentially heated cavity and the melting of pure gallium in a rectangular enclosure, it is shown that both boundary layers and sharp moving interior layers can be handled naturally by the proposed class of non-conforming methods. Due to the stabilising effect of the grad-div term and the robustness of discontinuous Galerkin methods, it is possible to solve the underlying problems accurately on coarse, non-adapted meshes. The interaction of heavy grad-div stabilisation and discontinuous Galerkin methods significantly improves the mass conservation properties and the overall accuracy of the numerical scheme which is observed for the first time. Hence, it is inferred that stabilised discontinuous Galerkin methods are highly robust as well as computationally efficient numerical methods to deal with natural convection problems arising in incompressible computational thermo-fluid dynamics. (C) 2017 Elsevier Inc. All rights reserved.
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