Numerical investigation on the impingement of spraying jet by an improved smoothed particle hydrodynamics method

Abstract

An improved smoothed particle hydrodynamics (SPH) method for simulating the high-velocity impingement of compressible jet flow is implemented. This improved SPH method proposes a treatment to restrict the undesired density dissipation in a specific case. In this research, a utility boundary treatment is proposed to simplify the assumption process of the particles approaching the solid boundary, and the principles of the equations employed in the simulation are illustrated in detail. A free surface condition considering the density and kernel function is employed to describe the gas jet accurately. Based on the improved SPH method we discussed, the case of a spraying jet impinging on a solid wall is simulated. The influence of the neglect of the surrounding particles is discussed. It is demonstrated that a closer distance near the free surface of fluid flow will lead to obvious decay of the density and pressure, the presented SPH method provides a reasonable approach to estimate the fluid characters when the amount of calculation is huge and the neglect of surrounding material is necessary.