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Taghizadeh Valdi, M., Atrechian, M., Jafary Shalkoohy, A., Chavoshi, E. (2019). Numerical Study of the Effect of Geometric Shape, Holes Distribution, and Drop Height of Projectile on Deepwater Velocity, Using Coupled Eulerian-Lagrangian Method. Electronic and Cyber Defense, 8(1), 25-42.
Mohammad hosein Taghizadeh Valdi; mohammadreza Atrechian; Ata Jafary Shalkoohy; Elham Chavoshi. "Numerical Study of the Effect of Geometric Shape, Holes Distribution, and Drop Height of Projectile on Deepwater Velocity, Using Coupled Eulerian-Lagrangian Method". Electronic and Cyber Defense, 8, 1, 2019, 25-42.
Taghizadeh Valdi, M., Atrechian, M., Jafary Shalkoohy, A., Chavoshi, E. (2019). 'Numerical Study of the Effect of Geometric Shape, Holes Distribution, and Drop Height of Projectile on Deepwater Velocity, Using Coupled Eulerian-Lagrangian Method', Electronic and Cyber Defense, 8(1), pp. 25-42.
Taghizadeh Valdi, M., Atrechian, M., Jafary Shalkoohy, A., Chavoshi, E. Numerical Study of the Effect of Geometric Shape, Holes Distribution, and Drop Height of Projectile on Deepwater Velocity, Using Coupled Eulerian-Lagrangian Method. Electronic and Cyber Defense, 2019; 8(1): 25-42.

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

مکانیک سیالات و آیرودینامیک
Article 3, Volume 8, Issue 1 - Serial Number 23, July 2019, Pages 25-42    PDF (1.49 M)
Document Type: Original Article
Authors
Mohammad hosein Taghizadeh Valdi1; mohammadreza Atrechian* 2; Ata Jafary Shalkoohy3; Elham Chavoshi4
1Department of Civil Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
2Department of Civil Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran
3Department of Civil Engineering, Bandar Anzali Branch, Islamic Azad University, Bandar Anzali, Iran
4Department of Civil Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
Receive Date: 28 January 2018,  Accept Date: 20 October 2018 
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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