%0 Journal Article %A Taghizadeh Valdi, Mohammad Hossein %A Atrechian, Mohammad Reza %A Jafary Shalkoohy, Ata %A Chavoshi, Elham %T Numerical and Experimental Study of a Spherical Projectile Water Entry Problem and Investigation of Mass and Impact Velocity Effect on Pinch-off Time and Depth %J Journal Of Marine Engineering %V 14 %N 27 %U http://marine-eng.ir/article-1-662-en.html %R %D 2018 %K Coupled Eulerian-Lagrangian, Spherical Projectile, Water Entry, Pinch-off Time and Depth, Viscous Energy, %X The water entry problem of spherical projectile is simulated numerically and experimentally in this study. An explicit dynamic analysis method is employed to model the fluid-structure interaction using a Coupled Eulerian-Lagrangian (CEL) formulation that is available in finite element code Abaqus. The comparison of the numerical simulation results including displacement and velocity variations of spherical projectile in water depth as a function of time, with the theoretical results, indicates a good match between these results and the precision and applicability of the numerical algorithm used. The results reveal that pinch-off time is a very weak function of projectile mass and impact velocity on free water surface; while the pinch-off depth significantly increases along with increased this parameters. Additionally, the projectile mass has a subtle effect on viscous dissipation energy, while increasing the impact velocity on free water surface leads to decrese in dissipation energy. %> http://marine-eng.ir/article-1-662-en.pdf %P 35-48 %& 35 %! %9 Research Paper %L A-10-986-1 %+ Zanjan Branch, Islamic Azad University %G eng %@ 1735-7608 %[ 2018