Velocity boundary models of inlet flow using moving particle semi-implicit method

The distinct velocity boundary models were established according to the different deformation degrees of the newly added liquid around the inlet area and on the basis of the moving particle semi-implicit method for the finite space inlet flow, semi-infinite space inlet flow and infinite space inlet flow in an open flow system. The velocity arrangement and the extra solid boundary were employed to avoid some problems such as discontinuous flow, and irregular and unsmooth free surface in the simulation with the models. With the present models, the three-dimensional injection and collision process of two liquid jets with circular cross sections was simulated. The results show that a typical liquid film is generated on the symmetrical plane by the collision. The data including the shape, thickness, saddle height and flow field of the film, and their unsteady changes can be gained from the calculation. The numerical simulation results agree with the physical principle. It appears that our findings not only significantly expand the application range of the moving particle semi-implicit method but also normalize the usage of the inlet flow models, which can improve the accuracy and convenience of the calculation.