"During the shipbuilding processes carried out in the shipyards, there is a need to transport the sections of ship structure, from the place where they are built to the assembly location. When the shape and structure of the sections allow, they are built in an inverted position, and after finishing all the works that can be performed in this type of placement, the section will have to be turned to continue the section building process and subsequent the assembly. Loads that appear in the structure during these maneuvers are different from those that appear during the operation and from those for which calculations were made at the stage of the initial project. Therefore, it is necessary to calculate them and design a lifting / turning installation, which should also contain stiffening elements where required, in order to prevent both accidents and deformations or detachments that could occur at the section level. From this necessity appears the plan generically called ""lifting plan"" and which contains the installations, the schemes, the necessary instructions to remove the units from the section building hall, turn it to the gantry cranes and brought into the mounting position."

In order to reduce the pollution caused by the expanding economy, solutions are sought to find new forms of energy instead of the one based on the burning of fossil fuels. In this context, the Nordic countries (Sweden, Denmark, the Netherlands, England, Norway) use the wind as a source of electricity generation. Thus, in the North Sea of the European continent, "windmills" appeared, which, through the generators, are coupled to a system of pale energy production. These complex installations are installed in large winds with strong winds that produce waves with high heights and short periods. Vessels that service these complicated installations must respond to safe sailing requirements for maintenance personnel and transported equipment. Since classical ships do not exactly fit these requirements, they look for forms of hulls that give good behavior to such large ones. In the paper, the Trimaran type ship is approached, using the CFD numerical methods, the shape of the bodies as well as the distance between the bodies so that the ship's behavior meets the safety requirements of the offshore installation.