In wet granulation processes, a particle adhesion mediated by a liquid bridge is one of the quite important phenomena. In an actual process, the liquid bridge shows dynamic motion due to motion of the particles. Therefore, understanding of a particle-particle adhesion by such a dynamic liquid bridge is an important issue. We have conducted a direct numerical simulation of the particle-particle adhesion by the dynamic pendular liquid bridge. In this review, our recent studies are presented. Firstly, a direct numerical simulation method is briefly explained. Secondly, verification and validation of the direct numerical simulation are presented. Finally, our work, where influence of the wettability of particles on the particle-particle adhesion of colliding particle through droplet was analyzed, is presented.