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Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)

ISSN: 2688-7231 (Online)


Sanjid C S
Department of Mechancial Engineering, IIT Bombay

Janani Srree Murallidharan
Department of Mechanical Engineering, Indian Institute of Technology Bombay, India

Atul Sharma
Department of Mechanical Engineering, Indian Institute of Technology, Bombay Mumbai, India

DOI: 10.1615/IHMTC-2019.780
pages 461-466


Modeling of flow and heat transfer phenomena in multiphase systems belongs to a specialized class of CFD problems, known as Computational Multi-Fluid Dynamics (CMFD). This class of problems coupled with Phase Change phenomenon is numerically challenging due to several factors like - tracking or capturing of interface, discontinuity of fluid and flow properties across the interface, implementation of singular (like surface tension) forces, phase change process occurring along the interface etc. Most phase change problems are solved in Staggered grid, though Co-located grid framework is more easily implementable. The major obstacle behind this could be attributed to the solution methodology of Co-located grid for high density ratio problems. Francois et al. (2006) observed that, inconsistency in discretization of interfacial forces and pressure force to be the major reason behind this and proposed a Balanced Force algorithm for simulation of high density ratio cases in Co-located grid. This Balanced Force approach resulted in estimation of interfacial forces at the faces of control volume rather than at the location of interface, which is physically inaccurate. Hence in this study, we implement a Sharp Interface Level Set Method (SI-LSM) using Ghost Fluid approach (GFM), in which we evaluate the interfacial forces at the interface, and show the robustness of this technique in high density ratio cases. By simulating and validating with several phase change benchmark problems, the applicability of this methodology to handle phase change phenomenon in Co-located grid is established.

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