3-DIMENSIONAL ANALYSIS OF DAM BREAK FLOW USING ANSYS

Abstract

Dams have been recognized for giving power which is the type of renewable energy, for surge insurance, and for making water accessible for agriculture and human needs. Dam break analysis is very crucial for investigating future effects caused to human life and property by the sudden release of large volume of water to the inundation area of a dam. The society gets profited in many ways from the dams but what will happen if dam fails. The consequences are devastating to the society, causes loss of human life due to short warning time available and extensive damage to properties. At the point when a dam is broken, catastrophic flooding will happen as the appropriated water escapes through the breach and streams into the downstream valley which may causes destruction in the downstream area. So, the safety of downstream area is one of the most important aspects during the planning and designing of dam. It is always assumed that large magnitude of flood wave is generated due to failure of dam and inundates large area along the downstream portion of river. Every well-constructed as well as proposed dams need to be examined for the possibility of dam break because even with advanced technology, failure cannot be fully rooted out based on the huge level risks associated with it. With the analysis of velocity profiles, pressure variation and turbulence effect in the downstream locations, we can reduce the vulnerabilities of dam break flood. The primary motivation behind the study was to examine an unsteady dam break flow. The work displayed here comprise of numerical study on dam break streams. Analyses were focused to assemble extensive information on an unsteady 3D Dam break streams. Dam break simulations were done by using a computational fluid dynamics package, ANSYS FLUENT. The 3D numerical simulations of dam break flow are vi

done using the large eddy simulation (LES) and the k-epsilon turbulence models and volume of fluid method is used for tracking the free surface of the dam break flow. Dam failure was simulated in ANSYS FLUENT. The gate was not specifically formed, it was just defined as a face without any named boundary conditions. The non-defined face will be taken as a sudden release dam break by the fluent.