Abstract
The research described in this paper was carried out to determine the hydrodynamic forces on the multi-hull tunnel vessel in steady motion. The hull form of vessel is fairly generated by the tunnel hull form generator code using the non-uniform rational B-Spline method. Then, the hydrodynamics simulation is carried out based on finite volume discretization method using volume of fluid model to consider free surface between water and air phases around the vessel. A dynamic mesh restructuring method is applied for grid generation regarding to the heave and pitch motions of vessel in each time step. The calculations of the center of gravity arising, trim angle, pressure, resistance and effective power are studied at various vessel’s speeds. The resistance plot versus velocity has an increasing trend having a hump velocity while the power curve shows a linear-like changes respect to speed increasing. Pressure calculations show that the ratio of hydrostatic pressure to total pressure is decreased at the end point of keel from 100 to 1 % as velocity increases from 5 to 20 m/s. The proposed numerical algorithm is a promising method for hydrodynamic analyses of wide-ranging high speed vessel types, particularly tunnel vessels.
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Abbreviations
- \( \vec{a} \) :
-
Linear acceleration vector of mass cent
- F V :
-
Volume Froude number
- g :
-
Gravity acceleration
- I G :
-
Moment inertia matrix of vessel
- k i :
-
Knot vector values
- m :
-
Mass of vessel
- n + 1:
-
Number of control points
- N i,q (k):
-
B-Spline basis functions
- p :
-
Static pressure
- P i :
-
Control point values
- q :
-
Order of NURBS curve
- r + 1:
-
Size of knot vectors
- u′:
-
Random fluctuation linear velocity in x direction
- \( \bar{u} \) :
-
Time average linear velocity in x direction
- u, v, w :
-
Linear velocity in x, y, z direction
- U :
-
Linear vector of velocity
- V S :
-
Velocity of vessel
- W i :
-
Control point weights
- α :
-
Angle between keel and stagnation line
- \( \vec{\alpha } \) :
-
Rotational acceleration vector of mass center
- β :
-
Deadrise angle
- θ :
-
Angle between keel and whisker spray
- λ :
-
Volume fraction of air in cell
- \( \nabla \) :
-
Volume displacement of vessel
- μ w , μ a :
-
Dynamics viscosity of water and air
- ρ w , ρ a :
-
Mass density of water and air
- \( \sum {\vec{F}} \) :
-
Total force vector of mass center
- \( \sum {\vec{M}_{G} } \) :
-
Total moment vector about mass center
- τ :
-
Trim angle
- \( \vec{\omega } \) :
-
Rotational velocity vector of mass center
- BEM:
-
Boundary element method
- LCG:
-
Longitudinal center of gravity
- VCG:
-
Vertical center of gravity
- CFD:
-
Computational fluid dynamic
- DOF:
-
Degrees of freedom
- FVM:
-
Finite volume method
- NURBS:
-
Non uniform rational B-Spline
- RANS:
-
Reynolds-averaged Navier–Stokes
- THFG:
-
tunnel hull form generator
- UDF:
-
User define function
- VOF:
-
Volume of fluid
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Acknowledgments
This research was supported by High Performance Computing Research Center (HPCRC) at Amirkabir University of Technology, which is acknowledged. Authors would like to thank the reviewers for their valuable comments.
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Technical Editor: Francisco Ricardo Cunha.
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Ghassabzadeh, M., Ghassemi, H. Determining of the hydrodynamic forces on the multi-hull tunnel vessel in steady motion. J Braz. Soc. Mech. Sci. Eng. 36, 697–708 (2014). https://doi.org/10.1007/s40430-013-0110-2
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DOI: https://doi.org/10.1007/s40430-013-0110-2