To satisfy the specific needs of our clients, the Gsea Design team is developing its own software.
Reliability, Innovation and Optimisation are the key words which drive us to develop our tooling.
Research and development program:

  • Thesis on Fluid-Structure Interaction (FSI) and on composite material fatigue (fatigue)
  • Member of the competitiveness clusters for innovation: Pôle Mer Bretagne, Pôle EMC2
  • Joint projects with research laboratories and universities: IFREMER (French Research Institute for Exploitation of the Sea, ENSTA Bretagne (French Graduate and Post-graduate engineering school and research institute), Institut de Recherche en Génie Civil et Mécanique (Research Institute for Mechanics and Civil Engineering), UBO (University of Western Brittany)


software_opheliaWe’ve developed a dedicated FEA design and optimisation tool (finite element calculations) for any beam pattern and hence masts. This tool relies on project references that have been tried and tested since 1986. Here are the main features:

  • Fast solutions (amounting to hours or a few days)
  • Validated by Nastran/Abaqus/Hyperworks
  • Interactivity with the design tool
  • Parametric tool

Furthermore, this software enables multiple calculations :

  • Linear static
  • Non-linear static
  • Linear buckling
  • Linear dynamics (requires data from an inertial platform)
  • Modal analysis – Eigenfrequency caculation
  • Optimisation module

As a result, we can study each load case influenced by the marine environment.


software_sofiaSOFIA is a software suite for the design of deformable lifting appendages (Foils, Rudders, Daggerboards for the watersports, blades on a wind turbine, etc.) using fluid structure interaction. It is in constant development with a doctor specialised in hydroelastic phenomena and fluid structure interaction in a fluid.

It is based on:

  • Linear and non-linear beam finite element method for the structural model
  • Method of tridimensional line lifting (ENSTA Bretagne- Gsea Design development) for the fluid model

The capabilities of this tooling enable the user:

  • To locate the equilibrium position of an appendage in a flow
  • To outline the hydrodynamic loads on an appendage
  • To optimise the structural design by taking into account the variations in load linked to appendage distortion
  • To optimise the appendage to obtain target stresses for the boat’s equilibrium in flight


sofware_alamoThis software is under continuous development with a materials doctor to help us accurately assess the mechanical properties of the multi-layered composite.

Prediction tooling:

  • elastic properties via various methods of homogenisation ranging from the rules of mixtures to the use of a micromechanical model of the breaking properties using various
  • mesoscopic criteria (Tsai-Hill, Tsai-Wu, Hashin, Puck) and specific analytical models (Fleck, Rosen, Argon, Budiansky) and, the micro-mechanical
  • properties over the long term under mechanical and thermal loading (using accelerated test methodologies and a micromechanical damage model)

The special interface enables elements from the constraint envelope to be visualised, instabilities in the composite to be calculated and sensitivity according to the rigidity and mass criteria to be realised.
It is a multi-scale tool, the likes of which does not exist among commercial tooling.

The strength of the tooling lies in the fact that it relies on an important database resulting from trials conducted on various matrixes, fibres and under various prompting.


SANDRASandra calculates the mechanical properties of hollow sections with slender shells.

The appeal of this software is that it is specially adapted to the specific features of composite materials, thus enabling the properties of a section associated with stacking to be quickly outlined.

Its strength lies in its ease of use, making it possible to iterate quickly so as to obtain an optimum structure, as well as having a variety of sections offered.
In this way, the software can calculate the properties of a boom, a boat’s float or a trimaran’s beam…