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We are developing

To satisfy the specific needs of our clients, the Gsea Design team is developing its own software since 25 years.

Reliability, Innovation and Optimization are the key words which drive us to develop our software.

This way we are today equipped with a full suit of software from material properties  homogenization to fluid structure interaction FEA calculation tool.

This suit of software allow us to study an appendage, mast or a boat platform in record time.

This investment was rewarded in 2016 by obtaining the price of high technology from the Nautical Industries Federation for our appendage design tool SOFIA.

Research and development program :

  • Thesis on Fluid-Structure Interaction (FSI) and on composite material fatigue 
  • Member of the 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)

OPHELIA is a stick finite element software. Initially developed in 1986 to design masts for racing boats, we’ve since made it evolve to design any type of slender structure from a multihull float to cargoship masts.

The advantage of a stick model is the gain in calculation and analysis time, allowing to study different configurations quickly without loosing precision or quality of the results.

Here are some features :

  • Creation of a parametric mast model
  • Aerodynamic loading
  • Creation of cables elements
  • Creation of lattice structures


Type of calculation :

  • Linear static
  • Non-linear static
  • Linear buckling
  • Linear dynamics
  • Modal analysis (vibration)
  • Optimization module


Today we use OPHELIA to :

  • Design, tune, optimize and validate all types of masts
  • Make pre study of multihulls platform
  • Design and calculate any type of beam type structure

We use

In our project management tooling, we constantly have our finger on the pulse regarding technology, from the most classic through to the most innovative, so as to guarantee the best possible compromise between costs/timeframe.
We run some of our digital simulations using recognised 2D and 3D CAD and FEA software.

HYPERWORKS is a pre / post processing suite, which enables data setting and analysis of finite element models. It’s a multiple solver enabling data setting for different types of solver OPTISTRUC / NX NASTRAN / ABAQUS…

The special feature of this suite is that it is geared towards Optimisation. Once it is coupled with the OPTISTRUCT solver, this tool is capable of providing the optimum stacking for a structure or the optimum form for an opening in a bulkhead.

Included in the HyperWorks suite, this topological optimisation software quickly pinpoints the optimum structure of simple parts.

FEMAP is a piece of simulation software that provides high performance finite element modelling. This upgradeable software solution for structural calculation in pre / post processing is compatible with the market’s main solvers, including NX Nastran, which is our chosen option.

We also selected this solution as FEMAP is recognised in the sectors of:

  • Marine & Offshore
  • Aerospace & Defence
  • Industrial machines & Equipment
  • Transport

(FEMAP provides interactive support to a wide range of solutions from NX Nastran: Linear and non-linear static, clean modes, Eigenvalue, dynamic, frequential response, spectral response, and random response. Furthermore, NX Nastran for FEMAP includes options for aero-elasticity, super-elements, optimisation and DMAP (Direct Matrix Abstraction Program))

For the design of 2D designs, we use AutoCAD LT, the most common CAD software in the world.

From simple definition drawings to ply by bly laminate scheme drawing, our draftmen will comply with your  specifications.


We’ve chosen to use the latest version of SOLIDWORKS with its FEA capabilities for the design of our mechanical pieces and for its capacity to run FEA analysis.

We use the Finite Element Analysis (FEA) functionality to calculate the constraints and displacement of parts and assemblies caused by internal and external loads.


To accompagny the diversification of projects we are working on, especially in the industry, we equiped the team in 2020 with the Dassault system suite “3D experience”.

A multi tool platform in a single interface that allows our designers and engineers to work with an optimized flow and within the industry standards.