https://doi.org/10.1140/epjp/i2019-12592-3
Regular Article
Effects of using obstacles on the dam-break flow based on entropy generation analysis
1
Department of Civil engineering, Hakim Sabzexvari University, Sabzevar, Iran
2
Department of Mechanical engineering, Hakim Sabzevari University, Sabzevar, Iran
* e-mail: e.lakzian@hsu.ac.ir
Received:
6
January
2019
Accepted:
22
February
2019
Published online:
28
May
2019
In the present research, the entropy generation analysis has been done in the dam-break flow with obstacles in different shapes. The damage to the downstream of dams is done by fluid energy. So, entropy generation was introduced as a measurement criterion of destruction. In this way, a numerical model has been developed to evaluate the dam-break phenomenon. In the developed model, the governing equations were discretized and solved using the simplified marker and cell method. Free-surface tracking has been done using the volume-of-fluid method. Based on the results, the averaged entropy generation is maximized, when square obstacles are installed at a distance of 
-1.9. In this equation, do is the distance between dam and obstacle, and H0 is the water depth. The results also show that the averaged entropy generation is maximized when the sidewall angle of the triangle obstacle is increased. However, based on the stability analysis, the sidewall angle of the triangle obstacle must be less than 
. Therefore, the triangle obstacle with sidewall angle is suggested as the optimum obstacle.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2019
