Scientia Iranica

Scientia Iranica

Numerical Assessment of turbulence effect on Forces, Spray parameters, and secondary impact in wedge water entry problem using k-ε method

Authors
Roya Shademani
Parviz Ghadimi
Department of Marine Technology, Amirkabir University of Technology, Tehran, Iran
10.24200/sci.2017.4028
Abstract
The present paper focuses on the assessment of turbulent effects on the impact force, spray, and secondary impact force of the wedge water entry. For this purpose, a finite element based finite volume method code coupled with volume of fluid has been developed. The k-ε method has also been implemented to model the turbulence effects. The developed code is validated against experimental data with good accordance and is then used to model the water entry of wedges with deadrise angles ranging from 10 to 60 degrees at different velocities of 1 and 2 m/s with laminar and turbulent assumptions. Subsequently, the resulting forces and free surfaces are compared for three critical instances of “Peak”, “Hollow”, and “2nd impact”. It is illustrated that turbulence has negligible effects on the force and free surface in the main water entry process. However, turbulent effects rise up to 14.23% for the secondary impact forces.
Keywords
Wedge Water entry
Free Surface
Impact Force
Secondary Impact
Finite volume method
Volume of Fluid
Scientia Iranica
Volume 24, Issue 1 - Serial Number 1
Transactions on Mechanical Engineering (B)
February 2017
Pages 223-236

  • Receive Date 07 June 2016
  • Accept Date 27 July 2017