Fluid Mechanics & Aerodynamics

Fluid Mechanics & Aerodynamics

Numerical Study of the Effect of Geometric Shape, Holes Distribution, and Drop Height of Projectile on Deepwater Velocity, Using Coupled Eulerian-Lagrangian Method

Document Type : Original Article

Authors
Mohammad hosein Taghizadeh Valdi 1
mohammadreza Atrechian 2
Ata Jafary Shalkoohy 3
Elham Chavoshi 1
1 Department of Civil Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
2 Department of Civil Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran
3 Department of Civil Engineering, Bandar Anzali Branch, Islamic Azad University, Bandar Anzali, Iran
Abstract
In this paper, water entry problem of three-dimensional projectiles with various geometrical shapes and different drop heights and holes distribution was numerically simulated by coupled Eulerian-Lagrangian (CEL) method and the effect of mentioned parameters on deepwater velocity and pinch-off time and depth was investigated by the commercial software Abaqus 6.14-2. The numerical results were verified by comparison and proper adaptation with available theoretical and experimental results, such as the movement trajectory of a spherical projectile in water depth, shape of formed air cavity, and pinch-off time and depth, which revealed the accuracy and capability of the numerical algorithm used. The results revealed that pinch-off depth is influenced by projectile geometrical shapes and significantly increases along with increased drop height from free water surface, while the pinch-off time is a very weak function of mentioned parameters. Also, the drag force of water has the highest and lowest effect on flat and pointy-nose projectiles, respectively. Hence, the cubical projectile with the highest velocity depreciation impact on the model bed with a velocity of 1.57m/sec and pinch-off depth occurs at a depth of 63cm, while the conical projectile with the lowest velocity depreciation has an impact velocity of 3.88m/sec and pinch-off depth occurs at a depth of 98cm.
Keywords
Water Entry
Geometric Shape
Holes Distribution
Drop Height
Coupled Eulerian–Lagrangian Method
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  • Receive Date 28 January 2018
  • Accept Date 20 October 2018
  • Publish Date 22 June 2019