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Effects of using obstacles on the dam-break flow based on entropy generation analysis

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Abstract.

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 \( d_o/H_0=1.8\)-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 \( 55^{\circ}\). Therefore, the triangle obstacle with \( 55^{\circ}\) sidewall angle is suggested as the optimum obstacle.

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Authors and Affiliations

  1. Department of Civil engineering, Hakim Sabzexvari University, Sabzevar, Iran

    Hassan Saghi

  2. Department of Mechanical engineering, Hakim Sabzevari University, Sabzevar, Iran

    Esmail Lakzian

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  1. Hassan Saghi
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  2. Esmail Lakzian
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Correspondence to Esmail Lakzian.

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Saghi, H., Lakzian, E. Effects of using obstacles on the dam-break flow based on entropy generation analysis. Eur. Phys. J. Plus 134, 237 (2019). https://doi.org/10.1140/epjp/i2019-12592-3

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