Unsteady two-phase simulation results using LB binary fluid model simulating two-phase flow through fibrous structure of carbon paper GDL; blue area is the liquid bubble and black colored area indicates solid obstacle (carbon fiber). 1~2: liquid droplet starts to move, driven by the mean flow and hit the porous surface, 3~8: droplet deforms and breaks up into smaller ligaments moving into the porous region, 9~12: detached droplets leave the porous area while the major part of liquid water is trapped and remains in the porous area. ReL = 0.1, Ca = 2.3 × 10-5.