DFHYDRO is the Naval Architecture calculations module of DEFCAR system. The vessel hydrostatic and stability characteristics are calculated, undamaged or damaged, as in calm water as in waves of any length and height.

Ship Geometry
DFHYDRO allows to define the geometry of a vessel by means of the hull cross sections. These cross sections can be defined by three ways: 
  • in a numerical way with points of an offset table
  • importing a DXF file
  • importing directly the hull geometry defined in the DFform module. 
Next, you can complete the vessel geometry defining screws, rudders, superestructures, etc. 
Once the vessel geometry is completted, you can calculate the hydrostatics and inclined buoying for diverse trims.

DFHYDRO allows to compartment the vessel in order to define the tanks, holds, etc. The different spaces obtained  can be joined, cut, etc. to define forms more complex.

You can also define cylindrical  compartments, boxes, etc.  One permeability value is assigned to each defined compartment (percentage of maximum occupation possible with regard to its theoretic volume).

Once the compartments are defined, you can obtain capacity tables of each one of them, with its centres of gravity and momentums of inertia.

Graphic results
DFhydro shows the results of the calculations in the following ways: 
  • graphic way (screen or printer/plotter)
  • tables (screen or printer) saved in files for pasting into word processor documents.

Loading conditions
DFhydro permits to define an unlimited number of loading conditions. Each one of these loading conditions are defined by means of the weights that constitute them. These weights can be specific, distributed in one compartment or according to some law.

For each loading condition, the module calculates static and dynamic stability curves and the corresponding angle of heel. This calculation can be done with the vessel undamaged or with only one or several flooded compartments.

With the results of the diverse conditions, the module calculates the maximum KG curve. All calculations are done using the direct method, recalculating the real centre of gravity for each equilibrium position . For each loading condition, longitudinal streng is also calculated.

Other calculations
DFhydro also makes another calculations for vessel design. Some of them are: 
  • Probabilistic method (coming soon)
  • Power prediction. 
DFhydro works in a friendly and known Windows environment, and this makes its use to be really easy. Any user can obtain the best efficiency of the module from the very first day.

Cintranaval-Defcar S.L.
Lauroeta Etorbidea, 4 48180 Loiu, Bizkaia (Spain)
Tlf: +34 902158081
Fax: +34 944638552