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A mesoscopic coarse-grain model for computationally-efficient simulations ofbiomembranes is presented. It combines molecular dynamics simulations for thelipids, modeled as elastic chains of beads, with multiparticle collisiondynamics for the solvent. Self-assembly of a membrane from a uniform mixture oflipids is observed. Simulations at different temperatures demonstrate that itreproduces the gel and liquid phases of lipid bilayers. Investigations of lipiddiffusion in different phases reveals a crossover from subdiffusion to normaldiffusion at long times. Macroscopic membrane properties, such as stretchingand bending elastic moduli, are determined directly from the mesoscopicsimulations. Velocity correlation functions for membrane flows are determinedand analyzed.

Coarse-Grain Model for Lipid Bilayer Self-Assembly and Dynamics: Multiparticle Collision Description of the Solvent