报告题目：

High-fidelity simulations of breaking waves and implementation of the VOF method on general curvilinear grids

报告人:                     Zhaoyuan Wang 博士

                                                 IIHR-Hydroscience and Engineering，University of Iowa

时间：2016年11月17日(周四)  09: 30

地点：中科院力学所会议中心202室

报告摘要：

Plunging wave breaking is of great importance to ship hydrodynamics, including strong turbulence with large amounts of air bubbles, water droplets, jets, and sprays. Previous experimental fluid dynamics (EFD) and computational fluid dynamics (CFD) studies on plunging wave breaking are mainly focused on the global structures of the wave breaking, such as wave elevation, jet, air entrainment, etc.  Moreover, due to the technical difficulties, the experimental measurements can only be done in water region, and detailed description of the energetic wave breaking region is not available.  With the development of the CFD technology, detailed studies of the two-phase region are possible.  In order to resolve the small structures of the wave breaking, such as air bubbles and water droplets at the scale of several micrometers, large scale parallel computations (billions of grid points) are needed.  In the present work, computational difficulties and challenges for large grid simulations are addressed.

The volume-of-fluid (VOF) method has been widely used in simulating two-phase interfacial and free surface flows since it was introduced. The VOF method has an excellent mass conservation property but its implementation is not straightforward since a complicated geometric procedure is needed for the interface reconstruction. Most of the VOF implementation algorithms were developed based on structured Cartesian grids. However, for flows with complex geometries, such as ship flows, a general structured grid is often needed. In this study, a second-order VOF method was developed for interface tracking on general structured grids with a second order distance function construction scheme. It has been incorporated into a general curvilinear grid solver and applied for simulations of ship hydrodynamics.

报告人简介：

Dr. Zhaoyuan Wang is an Associate Research Scientist and Adjunct Associate Professor working at IIHR-Hydroscience and Engineering of the University of Iowa. Dr. Wang received his PhD degree in May 2006 from the University of Texas at Arlington. In Sep. 2006, he joined IIHR of the University of Iowa as a Post-Doctoral Associate and then was promoted as an Assistant Research Scientist in Feb. 2009 and Associate Research Scientist in August 2015.