Collisional Coupling to Embedded Particles

7 Boundary Conditions and Embedded Objects 7.1 Collisional Coupling to Embedded Particles 

A very simple procedure for coupling embedded objects such as colloids or polymers to a MFC solvent has been proposed in [68]. In this approach, every colloid panicle or monomer in the polymer chain is taken to be a point-particle which participates in the SRD collision. If monomer i has mass mm and velocity w , the center of mass velocity of the particles in the collision cell is 

In order to use SRD to model suspended colloids with a radius of order 1 pm in water, this approach would require approximately 60 solvent particles per cell in order to match the Feclet number [16]. This is much larger than the optimum number (see discussion in Sect. 2.2.1), and the relaxation to the Boltzmann distribution is very slow. Because of its simplicity and efficiency, this monomer-solvent coupling has been used in many polymer [14,71-74] and colloid simulations [15,16,75,76]. 

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