Determination of the flooding zone during a dam break in a channel with a bend in the presence of several obstacles by the VOF method

This paper aims to investigate a dam break in a channel with a bend in the presence of several obstacles. To accurately determine the flood zones, it is necessary to take into account many factors such as terrain, reservoir volume. Numerical modeling was used to determine the flood zone. Numerical modeling based on the Navier-Stokes equations with a turbulent k-epsilon RNG model, the Volume of Fluid (VOF) method and the PISO algorithm were used to analyze the flow in a bend channel at an angle of 1⁰ with the obstacles. To verify the numerical model, a test on dam break in the 45⁰ channel was conducted. The simulation results were compared with experimental data and with the numerical data of existing data. Having been convinced of the correctness of the mathematical model, the authors carried out a numerical simulation of the main problem in three versions: without barriers, with one obstacle, with two obstacles. According to the obtained numerical results, it can be noted that irregular landforms held the flow, a decrease in water level and a slower time for water emergence could be seen. Thus, the water flow without an obstacle, with one obstacle and with two obstacles showed 4.2 s, 4.4 s and 4.6 s of the time of water appearance, respectively. This time shift can give a certain advantage when conducting various events to evacuate people.