Paper Title
Numerical Simulation Of Unsteady Flow Due To Dam Break
Abstract
To analyze and fully understand the natural phenomena such as unsteady flow phenomena resulting from dam
Break, developing of numerical models that can simulate the boundary conditions on the free surface flows with large
displacement that can and also deepen our understanding of the physical details of the interaction process of dam defeat
waves is of great importance. The purpose of this study is to analyze the hydrodynamic flow of the dam Break in vertical
two-dimensional way using fluent software and solving Navier-Stokes equations. This is achieved by collecting and
processing all the necessary information, the correct definition of the physical model is presented. Then using test and
comparison, the optimized parameters of the network size, suitable turbulence model and the turbulence term (plan) was
determined for different separation. Then, the values of the dimensionless wave front position with the passage of time and
the values of dimensionless water depth and pressure in certain sections have been calculated. To evaluate the model and the
equations used, the simulation results were validated with experimental results and other numerical methods in the literature.
Comparison results show the high accuracy and reliability of the method used. Based on the findings of this study it was
proved that Fluent Model has great capabilities in simulation of analysis and evaluation the phenomenon of dam Break. In
addition, it has the possibility of adaptation to different conditions and limitations of different problems. And after creating a
model in the software environment, the effects of following scenarios on it can easily be observed:
Effect of downstream slope of the dam in the reservoir on negative wave
The effect of input varying with time (hydrograph) on the negative wave created in the tank
The effect of the initial depth on the progress of flow created by flood at the time of Break
Two important parameters' influence the grid size and time step option on results
The effect of velocity gradients in the tank drain
Software inflow effect on results at 6 and 8 seconds
Effect of substrate roughness and depth of the coastal on the wave progress due to dam Break
Keywords- Dam Break Flows, Fluent, Simulation, Turbulence Model..., Barrier-free Flow