12.5 Free-Surface Flows
393
-3 1
'
I
I
L
I
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
1.2
Horizontal distance [rn]
Fig. 12.10. The free-surface profile in flow around NACA 0012 foil at 5" angle of
attack (Fr = 0.567), calculated on grids with 1004 CV, 4 016 CV, 16 064 CV, and
64 256 CV, compared with experimental data of Duncan (1983) (from Yoo, 1998)
In both the experiments and computations, the model is held fixed, i.e.
it is not allowed to sink and trim. The model moves at v = 1.697 m/s,
corresponding to a Froude number Fr = 0.7, based on the hull draft. The
Reynolds number, based on the hull length was around 3 . 4 ~
lo6.
Since wave breaking occurs, interface-capturing method is used. The grid
also extends 0.4 m into the air. Computations were carried out on three
numerical grids. The coarsest one had 103950 CVs, the medium one had
411180 CVs, and the finest one had 2147628 CVs.
Fig. 12.11. Geometry of the hull model
393
-3 1
'
I
I
L
I
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
1.2
Horizontal distance [rn]
Fig. 12.10. The free-surface profile in flow around NACA 0012 foil at 5" angle of
attack (Fr = 0.567), calculated on grids with 1004 CV, 4 016 CV, 16 064 CV, and
64 256 CV, compared with experimental data of Duncan (1983) (from Yoo, 1998)
In both the experiments and computations, the model is held fixed, i.e.
it is not allowed to sink and trim. The model moves at v = 1.697 m/s,
corresponding to a Froude number Fr = 0.7, based on the hull draft. The
Reynolds number, based on the hull length was around 3 . 4 ~
lo6.
Since wave breaking occurs, interface-capturing method is used. The grid
also extends 0.4 m into the air. Computations were carried out on three
numerical grids. The coarsest one had 103950 CVs, the medium one had
411180 CVs, and the finest one had 2147628 CVs.
Fig. 12.11. Geometry of the hull model