Before applying high flow concrete to construction site, the flow characteristics of high flow concrete should be evaluated. However, it is difficult to evaluate the construction performance by the experience of the practitioner in the construction site. Therefore, quantitative approach has become a major issue in recent years.

In this study, numerical analysis model to simulate flow of high flow concrete is developed. The Smoothed Particle Hydrodynamics (SPH) method, which simulates the fluid flow by discretizing physical properties of fluid into particles, assumes that the fluid has weakly compressible to solve the Navier-Stokes equations and continuity equation. This assumption can lead to non-physical pressure fluctuations due to small density variations. There is a problem that the flow field becomes unstable due to the phenomenon of aggregation of particles. In this study to improve these problems, we developed a numerical model that can simulate flow of high flow concrete using Incompressible Smoothed Particle Hydrodynamics (ISPH), which assumes the fluid to be incompressible and coupling problem of velocity and pressure using projection method.

For the simulation, a computer program code for ISPH was implemented with MATLAB programming code. A piecewise cubic spline function was used for the kernel function of ISPH. Projection method was used to calculate the velocity and pressure of particles as a function of time. Fixed ghost particle was used for wall boundary condition. Free surface boundaries were determined by using virtual density of particles. In order to validate the model and the code, the simulation results of T500 test, slump flow test, L-box test, V-funnel test were compared with experimental ones. The simulation results were well matched with the experimental results. The simulation described successfully the characteristics of the flow phenomenon according to the change of the viscosity and yield stress of high flow concrete.