Author(s): Keisuke Yoshida; Satoru Ushijima; Ryuji Tanaka; Nobu Miyagi; Shiro Maeno
Linked Author(s): Keisuke Yoshida
Keywords: Hydrodynamic force; Natural stone; Open-channel flow; 3D numerical simulation
Abstract: This study examines a numerical method that accommodates hydrodynamic forces acting on natural stone in openchannel flows. Numerical accuracy was verified through comparison with experimentally obtained results. We conducted three experiments with a stone model made of reinforced plastic, adjusting the flow discharge in a straight rectangular open-channel with a flat bed. For those experiments, we measured not only the drag force and lift force, but also the vertical velocity distribution of streamwise flow approaching in front of the stone. Additionally, we conducted numerical simulations to evaluate the forces acting on the numerically modelled stone. We approximately generated the numerical stone using tetrahedron elements in terms of a stone shape, imitating the actual model stone. For the computation model, we considered the mechanical interactions between fluid motions and the modelled stone, which behaves as a rigid body. Results show that numerical data related to the hydrodynamic forces are consistent with the experimental measurements. Therefore, the validity of our computation method was demonstrated.
Year: 2015