De La Fuente Rodr?guez Juan Manuel

Underwater particle-fluid coupled simulation of a shaped object

Yutaka Fukumoto, Satoru Otsuka

The main objective of this research is the study and understanding of the simulations of particles in bodies of water for their later use in the simulations of different problems such as landslides. For this, DEM-LBM simulations are used, and different particle shapes (square, circle, L-shape). Therefore, real experiments where acrylic figures are used to imitate the proposed forms are also needed. Between the simulations and the experiments, the biggest difference will be that the simulation is done in 2D, while the experiments are in 3D. So, it's about avoiding the 3D effect, by using a box that is only slightly larger than the width of the figures. This simulation method can be very useful, but also costly and complicated to perform. For this reason, only one particle of each shape is used, reducing the time and cost of simulating many particles. For the experiment using an acrylic box, water, and a camera. Reference points are also placed to capture particle motion more accurately for proper analysis. In the simulations, different results were obtained for each of the figures. The difference is the change of discrete time and space grid. These data are calculated based on the water�Ls viscosity (1x10-6). The relationship between discrete time and space grid (��x/��t>10) is important. So, the increase in space grid was proposed to reduce the calculation time of the simulation. Based on the results obtained, it can be observed that the most complex movements usually do not appear, or a different movement is observed in the 2D simulations, this is the case of the L shape. While the circular shape is affected by the reduction of the space since the rebound of the figure after the fall is not observed. The square figure does not represent a large change between the experiment and the simulation, nor is it affected by the change in value of the space grid.