Tag Archives: BEM


Boundary Element Methods are extensively used to model hydrodynamic forces in offshore devices like ships, offshore wind platforms and wave energy converters. These solvers use device geometry mesh to get some hydrodynamics coefficients as radiation damping, added mass, wave diffraction force, and wave excitation force. All these data is saved in file formats incompatible between them. These may avoid to use the coefficients between programs.

BEMRosetta allows to load the hydrodynamic coefficients from a format saving it in another. In addition it allows to compare the results obtained between programs, the results between similar geometries and the same geometry with different discretization levels.

In addition, BEMRosetta allows to view and visually compare the meshes from different programs.

BEMRosetta runs on Windows and Linux, it is done in C++ so install is simple, and it includes a GUI and a command line version.

Actually, BEMRosetta opens files from:

  • Wamit: .out, .3sc, 3fk, .1, .3, .4, .hst
  • Nemoh: Nemoh.cal, Mesh/Hydrostatics*.dat, Mesh/KH*.dat, RadiationCoefficients.tec, ExcitationForce.tec, DiffractionForce.tec, FKForce.tec, IRF.tec
  • FAST-Wamit: HydroDyn.dat, .1, .3, .hst
  • SeaFEM-Nemoh: .flavia.inf, RadiationCoefficients.tec, ExcitationForce.tec, DiffractionForce.tec, FKForce.tec
  • Ansys AQWA: .LIS, .AH1
  • COER FOAMM: .mat

BEMRosetta is free source. You can find all the code and resources in the Github page.


Nemoh – Open source BEM

Ladies and Gentleman, the moment you all have been waiting for is here – L’École Centrale De Nantes has released an open source boundary-element method (BEM) code called Nemoh for the computation of linear wave forces on and wave fields around floating bodies, i.e. wave energy converters (WECs). The software is being released under Apache License, Version 2.0.

An analysis with BEM software is the required first step in the design and modeling of a WEC. Commercial BEM codes can cost $25,000 and up. The release of a free and modifiable BEM software package can help a great number of small WEC developers and researchers who can’t afford the commercial version, and it has the potential to develop a community of users who are actively engaged in improving it!


You can obtain a copy of Nemoh here: http://lheea.ec-nantes.fr/doku.php/emo/nemoh/start?&#nemoh