ISSN Online: 2688-7231
ISBN Flash Drive: 978-1-56700-497-7
ISBN Online: 978-1-56700-496-0
Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)
SHARP INTERFACE LEVEL SET METHOD ON A CO-LOCATED GRID FOR PHASE CHANGE HEAT TRANSFER
Resumo
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.