Multi-scale and multi-physics modeling is useful and important for all areas in engineering and sciences. Particle Methods for Multi-Scale and Multi-Physics systematically addresses some major particle methods for modeling multi-scale and multi-physical problems in engineering and sciences. It contains different particle methods from atomistic scales to continuum scales, with emphasis on molecular dynamics MD, dissipative particle dynamics DPD and smoothed particle hydrodynamics SPH.This book covers the theoretical background, numerical techniques and many interesting applications of the particle methods discussed in this text, especially in micro-fluidics and bio-fluidics e.g., micro drop dynamics, movement and suspension of macro-molecules, cell deformation and migration environmental and geophysical flows e.g., saturated and unsaturated flows in porous media and fractures and free surface flows with possible interacting solid objects e.g., wave impact, liquid sloshing, water entry a