Example 4: Wigley Hull

This example shows the necessary steps in the hydrodynamic calculation of the so-called Wigley hull, with the Froude number set to 0.316 (see Equation 2) using the NAVAL module of Tdyn.

This example corresponds to a non-viscous case. In order to make the simulation easier, the symmetry of the geometry will be taken into account.

Note that this example cannot be run with the free-limited version of NAVAL module of Tdyn.

-         Wigley hull

-         Froude number equal to 0.3

-         Non-viscous case

Wigley hull is standard model for validation of both experimental and numerical data. The geometry of this model can be seen in Figure 47.

Figure 47. Wigley hull geometry.

A Wigley hull is created according to Equation 1, where parameters L, D and B represent length, beam and draft respectively.

Equation 1: Wigley hull

 For the example to be solved:

-         L=6                  (length)

-         B=0.6               (beam)

-         D=0.375         (draft)

The Froude number is given by Equation 2. In this equation v is the speed of the ship, g the gravity constant and L the characteristic length of the ship.

Equation 2 Froude number

By substituting the variables for its value in Equation 2, we obtain the speed:

v = 2.424 m/s