For multiple-author papers: Contact author designated by * Presenting author designated by underscore Modeling and Simulation of Discontinua Session Organizer: Shang-Hsien HSIEH (National Taiwan University) Keynote Lecture The roots of possible chaotic behavior in modeling and simulation of discontinua Antonio MUNJIZA * (University of London), T. CARNEY, E. KNIGHT, R.P. SWIFT, D. GREENING, D. STEEDMAN (Los Alamos National Laboratory) Motion analysis of mixed polyhedral and ellipsoidal particles Chung-Yue WANG *, Jopan SHENG, Chih-Jung HUANG, Ming-Hong CHEN (National Central University) A fluid-particle simulation for two-phase granular flow Li-Pen WANG , Ying-Pao LIAO, Chuin-Shan CHEN*, Fu-Ling YANG, Shang-Hsien HSIEH (National Taiwan University) Discrete element simulation of a collision-rich solid-liquid flow using a liquid-modified contact model Fu-Ling YANG *, Wei-Tze CHANG, Shang-Hsien HSIEH, Chuin-Shan CHEN (National Taiwan University)