Dr YAP Yit Fatt, researcher in the Petroleum Institute, Abu Dhabi

Date: |
2011-01-10 |

Time: |
11:00 to 12:00 |

Venue: |
Classroom 9-3-03 |

Two-phase flows are encountered in a wide range of engineering applications. Of particular challenge in the modeling of two-phase flows is the presence of an evolving interface separating the two immiscible fluids. To further complicate the matter, this fluid-fluid interface can undergo topological changes, e.g. the breakup of a droplet into two smaller droplets. This seminar focuses on the modeling of such type flows.

Modeling of two-phase flows requires two ingredients: (1) Interface Solver and (2) Physics Solver. The Interface Solver serves to capture an evolving interface driven by a given velocity field. For the present study, the Interface Solver consists of a particle level-set method implemented under the framework of a narrow-band approach.

The Physics Solver brings in physics into the evolving interface. The velocity field driving the evolving interface comes naturally from physics. For two-phase flows, the velocity field is governed generally by the Navier-Stokes equations. Additional physics influencing the velocity can be incorporated accordingly. The solver is based the finite volume method on a staggered grid with the SIMPLER algorithm.

The code was then validated against a variety of two-phase flow problems. The code was later used to study droplet (including magnetic fluid droplet) formation and its dynamics in microchannel.

YAP Yit Fatt is currently a researcher in the Petroleum Institute, Abu Dhabi. He received his Ph.D. (2007) in Mech. Eng. from Nanyang Technological University, Singapore. For his Ph.D., he worked on modeling of small scale multiphase flow problems. He was then a research fellow in NTU where he worked on modeling of two-phase flows with the narrow-band particle level-set method. His research interests include, but are not limited to, the development and application of numerical methods for problems involving heat transfer and fluid flow.