Simulation of Colloid-Polymer Systems using Dissipative Particle Dynamics

Comprehensive boundary method for solid walls in dissipative particle dynamics

“…Both these techniques result in a strong wall repulsion and a depletion of particles near the wall in non-ideal systems (a > 0). Later the idea of reflecting the particles in the wall boundary was introduced to guarantee the wallÕs impenetrability [19,20]. Nevertheless, a high wall density is still required to approach no-slip in systems with flow as shown by Revenga et al [20], again producing undesirable density distortions near the wall.…”

“…Most of them modelled flat walls by locally freezing the DPD particles [15][16][17][18][19][20], similar to the way solid objects such as colloidal particles are constructed [2,21,22]. The frozen particles interact as normal fluid particles, but have a fixed position and velocity, i.e., the wall velocity.…”

Accurate method for including solid–fluid boundary interactions in mesoscopic model fluids

“…Under this operation the average of the pre-and post-interface collision velocity of the particles is zero, so in this sense it always enforces a stick boundary. To enforce the second condition, we follow other workers and introduce a ''dummy" region [33][34][35][36][37][38][39]. This is a region of minimum width r c that contains a fluid that is identical to the fluid in the real system (all parameters, including the density, are equal).…”

Responsive polymer conformation and resulting permeability of clay–polymer nanocomposites

“…The equilibrium bond length ranging from 0 to 0.85r c has been adopted for a polymer molecule [20,23,28,29]. This harmonic spring can also be used as a 'bond' in a rigid particle.…”