Review Paper:
A Comprehensive
approach using CFD and GIS for dam break risk analysis: A case study on Nagarjuna
Sagar earthen dam
Nanna Sri Ramya, Reddy Madhusudhan M., Reddy Suryaprakash V., Saikumar R. and Tanuja
D.V.
Disaster Advances; Vol. 17(3); 35-47;
doi: https://doi.org/10.25303/173da035047; (2024)
Abstract
This study presents a comprehensive approach utilizing Computational Fluid Dynamics
(CFD) and Geographic Information Systems (GIS) to assess dam break risks with a
specific focus on the Nagarjuna Sagar earthen dam. The study examines the numerical
analysis of water flow dynamics resulting from a dam break. To depict this phenomenon,
a two-dimensional numerical model employing the volume of fluid method was developed.
The mathematical framework incorporates the Reynolds-averaged incompressible Navier-Stokes
equations with the turbulent k-e model and was employed. The computational approach
employed in this study is the SIMPLE algorithm. The CFD analysis involved meshing
with 42,282 nodes and 41,680 elements, while boundary conditions included one velocity
inlet and three pressure outlets open to the atmosphere. The flow was initialized
with a 5 m dam site, scaled down at 1:10 (1 meter in the model representing 10 meters
in reality). Data were collected for various time intervals (1s, 2s, 2.5s, 3s and
5s), The results of this study reveal the flow velocity patterns following dam break
events for the specified time intervals.
The outcomes are presented in terms of velocity magnitude vectors, static pressure,
dynamic pressure, total pressure, turbulence kinetic energy, volume fraction contours
and velocity magnitude profiles at different distances from the dam site (1m, 2m,
5m and 7m). A total of 250 iterations were performed to achieve these results, providing
valuable insights into the dynamics of dam break scenarios. This research contributes
to a better understanding of the potential consequences of dam failures and aids
in improving risk assessment and mitigation strategies for dams.
