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Frontiers of Structural and Civil Engineering

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Front. Struct. Civ. Eng.    2016, Vol. 10 Issue (4) : 438-444    https://doi.org/10.1007/s11709-016-0337-y
RESEARCH ARTICLE
Numerical modeling of cavitation on spillway’s flip bucket
Abbas PARSAIE1(),Sadegh DEHDAR-BEHBAHANI2,Amir Hamzeh HAGHIABI1
1. Department of water Engineering, Lorestan University, Khorramabad, Iran
2. Hydro Structures, Shahid Chamran University, Ahvaz, Iran
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Abstract

Numerical modeling of hydraulic phenomenon by computational fluid dynamic (CFD) approaches is one of the main parts in the high cost hydraulic structure studies. In this paper, using Flow 3D as CFD commercial tool, the cavitation phenomenon was assessed along spillway's flip bucket of the Balaroud dam. Performance of numerical modeling was compared to the physical model, which was constructed to this purpose. During numerical modeling, it was found that RNG turbulence model is a suitable performance for modeling the cavitation. Physical modeling shows that minimum cavitation index is about 0.85 and minimum cavitation index based on Flow 3D results is about 0.665, which was related to the flood discharge with return period of 10000 years. The main difference between numerical and physical modeling is related to the head of velocity, which is considered in physical modeling. Results of numerical simulation show that occurrence of cavitation based on cavitation index equal to 0.25 is not possible along the spillway.
Keywords cavitation Index      numerical simulation      spillway’s flip Bucket      CFD      Balaroud Dam      physical modeling     
Corresponding Author(s): Abbas PARSAIE   
Online First Date: 19 October 2016    Issue Date: 29 November 2016
 Cite this article:   
Abbas PARSAIE,Sadegh DEHDAR-BEHBAHANI,Amir Hamzeh HAGHIABI. Numerical modeling of cavitation on spillway’s flip bucket[J]. Front. Struct. Civ. Eng., 2016, 10(4): 438-444.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-016-0337-y
https://academic.hep.com.cn/fsce/EN/Y2016/V10/I4/438
Fig.1  Sketch of scaled model of Balaroud spillway flip bucket
Fig.2  Sketch of 3D model of Balaroud dam spillway
Fig.3  Balaroud dam spillway model in Flow 3D
Fig.4  Results of Flow 3D simulation at Q = 0.0667 (m3/s)
Fig.5  Results of Flow 3D simulation at Q = 0.0859 (m3/s)
Fig.6  Results of Flow 3D simulation at Q = 0.1903 (m3/s)
Fig.7  Measured pressure along Balaroud Dam spillway
piezometer number distance from the crest σcr Q = 66.7 (m3/s) Q = 85.9 (m3/s) Q = 160 (m3/s) Q = 190.3 (m3/s)
physical model Flow 3D physical model Flow 3D physical model Flow 3D physical model Flow 3D
22 6.407 0.25 1.78 1.55 1.78 1.85 1.1 0.97 1.29 1.02
23 6.507 0.25 1.39 1.62 1.32 1.83 1.14 0.96 1.24 1
24 6.607 0.25 1.41 1.6 1.29 1.74 1.22 0.92 1.09 0.95
25 6.717 0.25 1.7 1.51 1.34 1.62 1.08 0.9 1.02 0.9
26 6.807 0.25 1.57 1.55 1.43 1.49 1.13 0.9 1.07 0.92
27 7.207 0.25 1.65 1.28 1.45 1.26 1.11 0.87 1.1 0.89
28 7.58 0.25 1.16 1.07 1.25 1.01 0.93 0.76 1.09 0.81
29 7.978 0.25 1.11 0.94 1.14 0.98 0.94 0.67 0.94 0.68
30 8.178 0.25 1.11 0.91 1.03 0.95 0.84 0.7 0.87 0.66
31 8.378 0.25 0.95 0.97 1.05 1 0.77 0.81 1 0.84
32 8.438 0.25 0.84 1.08 1.05 1.18 0.97 0.93 1.23 1.04
33 8.542 0.25 0.9 1.53 1.31 1.79 1.13 1.33 1.53 1.42
34 8.602 0.25 1.28 1.76 1.53 2.05 1.25 1.42 1.58 1.53
35 8.662 0.25 1.37 1.71 1.56 2.07 1.4 1.43 1.61 1.53
36 8.722 0.25 1.5 1.88 1.46 1.94 1.26 1.48 1.59 1.47
37 8.782 0.25 1.66 1.88 1.51 1.7 1.26 1.2 1.37 1.22
Tab.1  Results of the measuring and Flow 3D cavitation Index
Fig.8  Cavitation index in flip bucket at Q = 0.0667 (m3/s)
Fig.9  Cavitation index in flip bucket at Q = 0.0859 (m3/s)
Fig.10  Cavitation Index in flip bucket at Q = 0.1903 (m3/s)
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