International Journal of Maritime Technology
International Journal of Maritime Technology
ijmt
Engineering & Technology
http://ijmt.ir
1
admin
2345-6000
2476-5333
10.29252/ijmt
en
jalali
1393
12
1
gregorian
2015
3
1
3
winter 2015
online
1
fulltext
en
Investigation of Keel Curvature Effect on the Hydrodynamic Characteristics of a V-Shaped Planing Surface
Ship Hydrodynamic
مقاله پژوهشي
Research Paper
In this paper, three-dimensional two phase turbulent free surface flow is solved by an in-house code. The incompressible Reynolds average Navier-Stocks equations (RANS) with k-ε turbulence model are solved by the finite volume method in the non-orthogonal curvilinear coordinates. For the modeling of the free surface effect, Lagrangian propagation volume tracking method (VOF-PLIC) is used. The code is validated solving two-phase turbulent flow through the impact problem of a circular cylinder. Then, the horizontal movement of a NACA standard wedge with 20 degree deadrise angle is simulated. The flow field and generated waves is estimated with different velocities. Numerical results of the average wetted lengths show acceptable compatibilities with the available experimental data. In addition, some modifications on the V-bottom are done to investigate the effect of the keel curvature and deadrise angle on the hydrodynamic forces. In each cases the ratio of the lift and drag coefficient to the conventional wedge with 20 degree deadrise angle is evaluated. It is depicted that the convex curvature doubles the drag coefficient and has not any significant effect on the lift coefficient. The results confirm that the deadrise angle reduction decreases the needed engine power in take-off. However, this reduction has a destructive effect at the time of landing.
Free surface, Turbulent, NACA , VOF, Wedge
Free surface, Turbulent, NACA body, VOF, Wedge
41
48
http://ijmt.ir/browse.php?a_code=A-10-179-2&slc_lang=en&sid=1
Hashem
Moradi
h_moradikh@yahoo.com
`10031947532846003020`

10031947532846003020
No
Kabir University of Technology, Hafez Avenue, Tehran, Iran
Amir Hossein
Nikseresht
nikser@sutech.ac.ir
`10031947532846003021`

10031947532846003021
Yes
Shiraz University of Technology, Modares Blvd. Shiraz, Iran
Alireza
Mostofizadeh
ArMostofizadeh@mut-ac.ir
`10031947532846003022`

10031947532846003022
No
Ashtar University of Technology, Isfahan, Iran