COMSOL Multiphysics^® version 5.6 simulation software from COMSOL, Burlington, MA, features four new products. A Fuel Cell & Electrolyzer Module enables accurate simulation of hydrogen fuel cells and water electrolyzers; the Polymer Flow Module analyzes non-Newtonian fluids; LiveLink™ for Simulink^® enables co-simulation of COMSOL Multiphysics and Simulink; and the Liquid & Gas Properties Module provides realistic fluid and fluid mixture properties. New application templates in the Application Builder, which is integrated in COMSOL Multiphysics, provide standardized layouts that include input fields, buttons, ribbon tabs, and graphics windows with options for desktop, tablet, and smartphone layouts. A new IPOPT optimization solver and realistic material rendering of plastics, metals, and organic materials also are included. Other features include faster solution time and faster ray tracing, nonlinear acoustics for high-intensity ultrasound, more efficient CFD solving, and CAD Import Module, Design Module, and LiveLink products for CAD.