Abstract
This paper investigates a calculation method for the heave and pitch motion of a trimaran, which includes direct and indirect calculation methods. In the direct calculation method, Computational Fluid Dynamics (CFD) simulation is applied to calculate trimaran motion. In the indirect calculation method, there exist three steps to achieve motion calculation: first, a standard wave spectrum is chosen to excite the wave force and moment acting on the trimaran; second, particle swarm optimization (PSO) and polynomial fitting methods are adopted to identify the function of wave force and moment; finally, the mathematical model of the trimaran is established. To compare the effectiveness of the direct and indirect methods, the model test of the trimaran is performed in a towing tank. The results of the model test proved that the direct and indirect methods are all effective for calculating the heave and pitch motions of a trimaran.
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Abbreviations
- PSO:
-
Particle swarm optimization
- \(W2F\) :
-
The transfer function of wave-to-force
- \(W2M\) :
-
The transfer function of wave-to-moment
- \(F2H\) :
-
The transfer function of force to heave
- \(F2P\) :
-
The transfer function of force to pitch
- \(M2H\) :
-
The transfer function of moment to heave
- \(M2P\) :
-
The transfer function of moment to pitch
- \(L\) :
-
Length of trimaran
- \(B\) :
-
Beam of trimaran
- \(D\) :
-
Depth of trimaran
- \(T\) :
-
Draught of trimaran
- VOF:
-
Volume of fluid
- \(S_{\zeta } (\omega )\) :
-
The function of spectrum density
- \(H_{S}\) :
-
Significant wave height
- \(T_{1}\) :
-
Wave period
- \(\omega\) :
-
Circle frequency
- \(\omega_{e}\) :
-
Encounter frequency
- \(z\) :
-
Heave (m)
- ITTC:
-
International Towing Tank Conference1
- \(a_{ij}\) :
-
Added mass
- \(b_{ij}\) :
-
Damping coefficients
- \(c_{ij}\) :
-
Restoring coefficients
- \(m\) :
-
Mass of the trimaran
- \(I\) :
-
Longitudinal inertia of the trimaran
- \(F_{3}\) :
-
Wave force
- \(M_{5}\) :
-
Wave moment
- CFD:
-
Computational Fluid Dynamics
- RANS:
-
Reynolds Averaged Navier–Stokes
- \(P\) :
-
Scale ratio
- \(v\) :
-
Speed of the trimaran
- PF:
-
Polynomial fitting
- EFD:
-
Experimental fluid dynamics
- SST:
-
Shear stress transport
- \(G(s,\alpha )\) :
-
The transfer function of wave-to-force and moment
- \(B(s,\alpha )\) :
-
Numerator term of the transfer function
- \(A(s,\alpha )\) :
-
The denominator of the transfer function
- \(J(\alpha )\) :
-
The cost function
- DOF:
-
Degree of freedom
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Funding
The work of Zhilin Liu was supported by National Natural Science Foundation of China, under Grant 51379044.
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Zheng, L., Liu, Z., Zeng, B. et al. Experimental and numerical study on heave and pitch motion calculation of a trimaran. J Mar Sci Technol 28, 136–152 (2023). https://doi.org/10.1007/s00773-022-00910-9
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DOI: https://doi.org/10.1007/s00773-022-00910-9