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Hull and Propulsor Design

Design and optimization of hull form
The design and optimization of the hull lines of the ships are based on:

  • Experience of studies and projects the use of the tests data base.
  • Mathematical simulations and hydrodynamic calculations of qualitative value

that make it possible to compare the modifications of a hull analyzing its hydrodynamic behavior, such as resistance, wave generation, its maneuverability and sea-keeping qualities.

At the preliminary phase of the project, the distribution of entropy on the hull is analyzed using a new method to get a qualitative idea about the resistance and the affecting zones that can be modified.

Salida de los programas de CFD de formas
Salida de los programas de CFD de formas

 

For a more detailed study of the ship lines we use CFD codes that calculate:

  • Potential, linear and non-linear flow.
  • Boundary layer.
  • Viscous flow.

These programs provide information for the analysis of ship form, especially at the bow. It is thus very useful in the design of bow bulbs. The information is also a key part of decision-making about the position of the appendages.

For the stern lines of single-propeller ships, the optimization is done by comparing predicted wake configurations.

Predicción de la configuración de la estela y Salidas gráficas de los programas de optimización de formas.

Design and optimization of propellers
For the design of the propellers, the classical “series - lifting-line – lifting surface” approach is used, together with some advanced codes obtained through a Consortium leaded by the Massachusetts Institute of Technology and the University of Texas and implemented in CEHIPAR.

The scope of those programs is quite wide, including:

  • Cavitation analysis of propellers functioning in steady and unsteady regimes.
  • Calculation of the six components of the forces and moments on the propeller shaft.
  • Pressure fluctuations acting on the stern of the hull.
  • Pressure distribution on both sides of the blades at given circumferential position.
Salida de los programas de predicción de funcionamiento de propulsores

Definition of hull lines
Once the design of the hull lines and propeller is complete, we proceed to following procedures:

  • Smoothing of the hull lines.
  • Calculations of straight or inclined hulls.
  • Preparation of high precision data for numerically-controlled manufacturing of the hulls and propellers.
Vista 3D de un propulsor listo para mecanizado
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