TY - JOUR

T1 - Introduction of the open-source boundary element method solver hams to the ocean renewable energy community

AU - Liu, Yingyi

N1 - Funding Information:
The author thanks Inaki Zabala (SENER Ingenier??a) for developing the pre- and post-processing interface in BEMRosetta for HAMS, and Garrett Barter (NREL) for developing PyHAMS as a Linux version of HAMS.
Publisher Copyright:
© European Wave and Tidal Energy Conference 2021.

PY - 2021

Y1 - 2021

N2 - A floating offshore renewable energy (ORE) device, such as an offshore wind turbine or wave energy converter, often consists of a floating foundation anchored by a mooring system. Wave interactions with the substructure are essential to its survivability and performance. In the recent decade, an open-source numerical solver HAMS has been developed based on the potential flow theory in analyzing wave-interactions with a three-dimensional arbitrarily-shaped floating or submerged body. The hybrid source-dipole boundary integral equation provides a high degree of accuracy. The so-called irregular frequencies are removed by applying the least-squares method, avoiding the additional numerical work in resolving the wave potentials on the water-plane cross-section. The lower–upper (LU) decomposition method is then used to solve the complex linear algebraic system. Planes of symmetry and parallelism techniques are employed to speed up the computation. Wave diffraction forces, radiation hydrodynamic coefficients and response amplitude operators (RAOs) are evaluated after the wave potentials are obtained. The freesurface elevation and the wave pressure field are also available at the users’ choice. A numerical benchmark of the DeepCwind semisubmersible platform is supplied for illustration of using the solver.

AB - A floating offshore renewable energy (ORE) device, such as an offshore wind turbine or wave energy converter, often consists of a floating foundation anchored by a mooring system. Wave interactions with the substructure are essential to its survivability and performance. In the recent decade, an open-source numerical solver HAMS has been developed based on the potential flow theory in analyzing wave-interactions with a three-dimensional arbitrarily-shaped floating or submerged body. The hybrid source-dipole boundary integral equation provides a high degree of accuracy. The so-called irregular frequencies are removed by applying the least-squares method, avoiding the additional numerical work in resolving the wave potentials on the water-plane cross-section. The lower–upper (LU) decomposition method is then used to solve the complex linear algebraic system. Planes of symmetry and parallelism techniques are employed to speed up the computation. Wave diffraction forces, radiation hydrodynamic coefficients and response amplitude operators (RAOs) are evaluated after the wave potentials are obtained. The freesurface elevation and the wave pressure field are also available at the users’ choice. A numerical benchmark of the DeepCwind semisubmersible platform is supplied for illustration of using the solver.

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M3 - Conference article

AN - SCOPUS:85120087881

SP - 2196-1-2196-5

JO - Proceedings of the European Wave and Tidal Energy Conference

JF - Proceedings of the European Wave and Tidal Energy Conference

SN - 2706-6932

T2 - 14th European Wave and Tidal Energy Conference, EWTEC 2021

Y2 - 5 September 2021 through 9 September 2021

ER -