Experimental and Numerical Studies on Local Scour around Closely Spaced Circular Piles under the Action of Steady Current
Abstract
:1. Introduction
2. Experimental Model
2.1. Experimental Setup
2.2. Experimental Results and Discussion
3. Numerical Models
3.1. Model Setup
3.2. Verification of the Hydrodynamic Model
3.3. Verification of the Sediment Scour Model
4. Numerical Results and Discussion
4.1. Hydrodynamic Characteristics
4.2. Scour Features
5. Conclusions
- The scour depth around the closing spacing pile was much larger than the scour depth around a single pile with the same diameter under the same flow intensity.
- The shear stress increased rapidly with a decrease in the pile spacing. When was larger than O(3), the shear stress distribution of closely spaced piles could be treated as a single pile.
- The scour depth increased rapidly with a decrease in pile spacing. When was larger than O(4), the scour depth could be treated as a single pile.
- There were flat areas both in front of and behind the pile; the main hydrodynamic mechanics for those areas were the compressed horseshoe vortex and shedding vortex.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Exp. | (cm) | (m) | (h) | (cm) | ||
---|---|---|---|---|---|---|
1 | 30 | 0.44 | 0.10 | 1.50 | 5.0 | 12.2 |
2 | 30 | 0.44 | 0.10 | 1.25 | 5.0 | 18.0 |
(mm) | (kg/m3) | Entrainment Coefficient | Bed Load Coefficient | Angle of Response | |
---|---|---|---|---|---|
0.66 | 2650 | 0.029 | 0.20 | 0.50 | 32° |
Case | Model Type | |
---|---|---|
1 | Closely spaced circular piles | 1.5 |
2 | Closely spaced circular piles | 1.8 |
3 | Closely spaced circular piles | 2.0 |
4 | Closely spaced circular piles | 3.0 |
5 | Closely spaced circular piles | 4.0 |
6 | Single pile |
Case | Scale in the X-Direction | Scale in the Z-Direction | ||
---|---|---|---|---|
1 | 1.5 | 13.4 | ||
2 | 1.8 | 9.0 | ||
3 | 2 | 4.7 | ||
4 | 3 | 0 | 0 | 1.1 |
5 | 4 | 0 | 0 | 0.96 |
6 | 0 | 0 | 0.9 |
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Lu, Y.; Wang, Z.; Yin, Z.; Wu, G.; Liang, B. Experimental and Numerical Studies on Local Scour around Closely Spaced Circular Piles under the Action of Steady Current. J. Mar. Sci. Eng. 2022, 10, 1569. https://doi.org/10.3390/jmse10111569
Lu Y, Wang Z, Yin Z, Wu G, Liang B. Experimental and Numerical Studies on Local Scour around Closely Spaced Circular Piles under the Action of Steady Current. Journal of Marine Science and Engineering. 2022; 10(11):1569. https://doi.org/10.3390/jmse10111569
Chicago/Turabian StyleLu, Youxiang, Zhenlu Wang, Zegao Yin, Guoxiang Wu, and Bingchen Liang. 2022. "Experimental and Numerical Studies on Local Scour around Closely Spaced Circular Piles under the Action of Steady Current" Journal of Marine Science and Engineering 10, no. 11: 1569. https://doi.org/10.3390/jmse10111569
APA StyleLu, Y., Wang, Z., Yin, Z., Wu, G., & Liang, B. (2022). Experimental and Numerical Studies on Local Scour around Closely Spaced Circular Piles under the Action of Steady Current. Journal of Marine Science and Engineering, 10(11), 1569. https://doi.org/10.3390/jmse10111569