Abstract
We developed a new boundary condition of constant pressure for an inlet and outlet of a particle method. This allows us to generate fluid particles at an inlet boundary and delete fluid particles at an outlet boundary where pressures are fixed. The positions of generating particles were determined by the steepest descent method and virtual cells. Dirichlet boundary condition was given to boundary particles indirectly by considering virtual particles. We simulated Poiseuille flows under various cases by using the developed boundary condition, and compared the simulated flow velocities with theoretical values. As a result, the flow velocities were close to the theoretical values, and the efficiency of the developed boundary condition was shown.
