Peiyuan Liu, PhD, is a postdoctoral researcher in chemical engineering at the Univ. of Colorado, Boulder (Email: peiyuan.liu@colorado.edu). His experience covers discrete element modeling of particulate flows and multiphase flows, including interparticle forces, agglomeration, and breakage in gas-solid flows. Liu received his BS in materials science from the Univ. of Science and Technology Beijing, China and PhD from the Univ. of New South Wales, Australia.