Continuity equation does not solve in the Simulation of nanoparticles using DDPM
 

I am using Fluent 15.0 for simulation of nonfluid flow through oil wellbore. The mesh was generated using ICEM 15.0, and its quality is very acceptable. However, as the nanoparticle tracked the residual of the continuity goes high (over 20). Please, can anyone have a solution for that problem?


Thank you