ISPH Numerical Modeling of Dam Break Waves in a Dry Bed with a Hump

Sajedeh Farmani Khanehkahdani, Gholamabbas Barani, Mahnaz Ghaeini-Hessaroeyeh, Rasoul Memarzadeh

Thursday 2 july 2015

17:33 - 17:36h at Amazon (level 1)

Themes: (T) Water engineering, (ST) River and coastal engineering, Poster pitches

Parallel session: Poster pitches: 13B. River Engineering

In this paper, dam break waves are modeled on uneven bed using Incompressible Smoothed Particles Hydrodynamics method. ISPH is a lagrangian and meshless method based on particles, which is robust to simulate flows with large deformations and complicated surface flows. Governing equations are mass and momentum conservation equations that are solved using a two- step fractional method. In the first step, Navier-Stokes equations are solved by omitting pressure term and in the absence of incompressible condition. In the second step, the pressure term is applied and velocity values and exact particles position are computed. In the present model, a new technique is applied to allocate density to the particles. By employing this technique, ISPH method is stabled. In order to study of model applicability and its validation, dam break problem in bumpy channel with open end is studied. Finally The simulated results indicate that many complicated flow phenomena occurred in dam break flows particular as clashing with obstacle such as, shock front propagation, partial reflections, hydraulic jumps and wave interaction, can be well simulated using ISPH method. Also the error maximum of numerical model comparison with experimental data is computed 11.7 percent. The good agreement between the results of present model and experimental data shows that ISPH model is powerful device to simulate complicated problems.