Civil and Project journal

Numerical investigation of the water entry problem of reticulated pounders with matrix arrangement

https://doi.org/10.22034/cpj.2024.451993.1267
Volume 6, Issue 4 - Serial Number 62
June 2024
Pages 26-42
Civil and Project journal

Document Type : Research Article

Authors

Mohammad Hossein Taghizadeh Valdi 1
Edris Merufinia 2

1 Ph.D. in Geotechnical Engineering, Lecturer of University and Guilan Construction Engineering Organization, Rasht, Iran

2 Young Researchers and Elite Club, Mahabad Branch, Islamic Azad University, Mahabad, Iran & West Azerbaijan Regional Water Company, Urmia, Iran.

Abstract
In this article, the water entry problem of reticulated pounder including 4, 9, 16, 25 and 64 holes which are distributed with a matrix arrangement on the surface of the pounder, is investigated numerically and to model the interaction between the pounder and fluid, an explicit dynamic analysis was employed using the Eulerian-Lagrangian couple formulation available in the commercial finite element software Abaqus 6.14-2. The results of the numerical solution were validated by comparing and matching the numerical, theoretical and experimental results of the trajectory of a spherical projectile in the depth of water, including the shape of the air bubble formed and the pinch-off time and depth, which indicated the accuracy and application of the numerical algorithm used. The results of the current research showed that the 9-hole pounder reaches the model bed at a depth of 100 cm in less time than other pounders with different arrangement and number of holes. In 16- and 25-hole pounders, the ratio between the mass of the pounder and the area of the holes is unstable, and due to the decrease in the area of the holes, the effect of water resistance on the bottom of the pounder increases when it moves in its depth. The effect of increasing the mass of the pounder on reducing the duration of its immersion in the water depth is more evident in the 64-hole pounder. So that this pounder has a smaller area of holes compared to other pounders, it has more mass with smaller holes than other pounders, and despite the smaller dimensions of the holes and the increase in the life of the reticulated pounder, which is the factor that increases the resistance of the water entering the pounder floor, due to the large mass of the pounder, it overcomes the water resistance that is applied as an upward force on the bottom of the reticulated pounder, and the duration of its movement in the depth of the water is reduced from the moment it hits the free surface of the water until it reaches the model bed.

Keywords

Reticulated pounder
Matrix arrangement
Eulerian-Lagrangian couple
Water entry problem
Pinch-off Time and depth
Subjects
Akbari, M. A., Mohammadi, J., & Fereidooni, J. (2021). A dynamic study of the high-speed oblique water entry
of a stepped cylindrical-cone projectile. Journal of the Brazilian Society of Mechanical Sciences and
Engineering, 43, 1-15.
Aristoff, J. M., Truscott, T. T., Techet, A. H., & Bush, J. W. (2010). The water entry of decelerating
spheres. Physics of fluids, 22(3).
Bai, X. D., Zhang, W., & Wang, Y. (2020). Deflected oscillatory wake pattern behind two side-by-side circular
cylinders. Ocean Engineering, 197, 106847.
Bo, H., Yang, B., Du, C. J., Dai, H., & Liu, L. W. (2022). Influence rule of projectile density on the characteristics
of high-speed water-entry cavity. Journal of Applied Fluid Mechanics, 15(6), 1901-1912.
Chen, T., Huang, W., Zhang, W., Qi, Y., & Guo, Z. (2019). Experimental investigation on trajectory stability of
high-speed water entry projectiles. Ocean Engineering, 175, 16-24.
Epps, B. P., Truscott, T. T., Lafoy, R. R., & Techet, A. H. (2009, November). Resolving the unsteady deceleration
and forces after water entry by low mass-ratio spheres. In APS Division of Fluid Dynamics Meeting
Abstracts (Vol. 62, pp. AG-001).
Forouzani, H., Saranjam, B., Kamali, R. and Abdollahi-far, A., (2016), Elasto-plastic time dependent impact
analysis of high speed projectile on water surface, Journal of Solid and Fluid Mechanics, Vol. 3, p. 281-298.
Civil and Project Journal, 2024, 6(4), 26-42
https://doi.org/10.22034/cpj.2024.451993.1267
42
Guo, Z. T., Zhang, W., & Wang, C. (2012). Experimental and theoretical study on the high-speed horizontal water
entry behaviors of cylindrical projectiles. Journal of Hydrodynamics, 24(2), 217-225.
Li, D., Zhao, X., Kong, D., Shentu, J., Wang, G., & Huang, B. (2020). Numerical investigation of the water entry
of a hydrophobic sphere with spin. International Journal of Multiphase Flow, 126, 103234.
Li, Y., Zong, Z., & Sun, T. (2021). Crushing behavior and load-reducing performance of a composite structural
buffer during water entry at high vertical velocity. Composite Structures, 255, 112883.
Lu, L., Wang, C., Li, Q., & Sahoo, P. K. (2021). Numerical investigation of water-entry characteristics of highspeed
parallel projectiles. International Journal of Naval Architecture and Ocean Engineering, 13, 450-465.
Lu, L., Wang, C., Li, Q., & Sahoo, P. K. (2021). Numerical investigation of water-entry characteristics of highspeed
parallel projectiles. International Journal of Naval Architecture and Ocean Engineering, 13, 450-465.
Schouveiler, L., Brydon, A., Leweke, T., & Thompson, M. C. (2004). Interactions of the wakes of two spheres
placed side by side. European Journal of Mechanics-B/Fluids, 23(1), 137-145.
Schwalbach, D. S., Shepard, T., Kane, S., Siglin, D., Harrington, T., & Abraham, J. P. (2014). Effect of impact
velocity and mass ratio during vertical sphere water entry. Dev. Appl. Oceanic Eng, 3, 55-62.
Sooraj, P., Khan, M. H., Sharma, A., & Agrawal, A. (2019). Wake analysis and regimes for flow around three
side-by-side cylinders. Experimental Thermal and Fluid Science, 104, 76-88.
Spinosa, E., & Iafrati, A. (2021). Experimental investigation of the fluid-structure interaction during the water
impact of thin aluminium plates at high horizontal speed. International Journal of Impact Engineering, 147,
103673.
Sun, T., Wang, H., Zou, L., Zong, Z., & Li, H. (2019). Experimental study on the cavity dynamics of oblique
impact of sphere on a viscous liquid floating on water. Ocean Engineering, 194, 106597.
Wang, Z., Feng, P., Liu, G., Zhao, X., & Qin, X. (2022). Load and motion behaviors of ogive-nosed projectile
during high-speed water entry with angle of attack. Ocean Engineering, 266, 112937.
Xia, S., Wei, Y., Wang, C., Cao, W., & Hu, X. (2023). Numerical investigation of the high-speed vertical water
entry of a cylindrical shell. Physics of Fluids, 35(3).
Yao E., Wang H., Long Pan., Wang X. and Woding R., (2014), Vertical Water-Entry of Bullet-Shaped Projectiles,
Journal of Applied Mathematics and Physics, Vol. 2, p. 323-334.
Yu, Y., Shi, Y., Pan, G., Chen, X., & Gao, S. (2022). Effect of asymmetric nose shape on the cavity and mechanics
of projectile during high-speed water entry. Ocean Engineering, 266, 112983.
  • Receive Date 11 April 2024
  • Revise Date 19 April 2024
  • Accept Date 20 April 2024
  • First Publish Date 20 April 2024
  • Publish Date 21 June 2024

Home

Submit

Contact Us

Forthcoming Articles