Abstract:
Drag analysis based on CFD (computational Fluid Dynamics) simulation has become a
decisive factor in the development of new, economically efficient and environmentally
friendly ship hull forms. Recently, computational Fluid Dynamics (CFD) has been
experiencing rapid advances due to both computer technology progress and efficient
algorithms that have been developed to solve the Navier-Stokes(N-S) equations used in
the flow analysis around ship hulls. Three-dimensional finite volume method (FVM)
based on Reynolds averaged Navier-Stokes equations (RANS) has been used to simulate
incompressible flow around two conventional models namely Wigely parabolic and
Series 60 hull in steady-state condition. Different turbulence models such as Standard k-
ε, Realizable k-ε and Shear stress transport (SST) k-ω are used with standard wall
function to measure the drag coefficient. It is observed that k-ε turbulence model shows
better performance than any other model. The numerical solutions of the governing
equations have been obtained using commercial CFD software package FLUENT 6.3.26.
Model tests conducted with these two models are simulated to measure various types of
drag coefficient at different Froude numbers. The numerical results in terms of pressure
coefficient and drag coefficient for different Froude numbers have been shown
graphically or in the tabular form. The agreement between the numerical results and the
experimental indicates that the implemented code is able to reproduce correctly the drag
coefficient, pressure field, velocity field and the free-surface elevation around the Wigely
parabolic and Series 60 hull. Velocity vectors as well as contour of pressure distribution
have also been displayed graphically. The computed results show good agreement with
the experimental measurements/numerical results at a Froude number below 0.3.
