Abstract
Because of the soft potential that dissipative particle dynamics(DPD)employs,the boundary conditions are difficult to impose.A new boundary condition was proposed by giving a virtual velocity to the wall particles.The wall particles do not move in the simulation,and the virtual velocity is used in the calculation of the dissipative force between wall particles and fluid particles,which can increase the dissipative force of the fluid particles,thus,the new boundary model can achieve the no-slip boundary conditions.Poiseuille flow was simulated in a narrow channel to demonstrate the validity of this boundary model.The simulation results of velocity,density and temperature distribution in the channel show that the new boundary condition model is an effective way to implement no-slip boundary conditions,and effectively eliminates density fluctuations in the near wall region.But when density of the wall is more than 8.0,the new wall boundary condition will be unable to work well.The good agreements of the simulation results with the theoretical solution of Navier-Stokes equation also verify the validity of the new model and DPD program.
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