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20 H.AKYILDIZ

3. Results and discussions
3.1 Free surface elevation
Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig.9 denote the snapshots of the liquid motion including
the free surface deformation and the velocity at regular intervals during one period (T) of the
rolling tank for different baffle heights. In the case of the unbaffled tank, the liquid sloshing is
enough to reach to the top wall of the tank after impacting on the side walls of the tank as shown
in Fig. 6(a-d). When the tank has the vertical baffle or the T-shape baffle with the height of hB /
h = 0.2 and hB / h = 0.4, the pattern of liquid sloshing is almost similar to the case of the
unbaffled tank as shown in Fig. 7(a-d) and Fig. 8(a-d). T-shape baffle represents the shallow
water effects and the free surface behavior is getting stable slowly due to the wave breaking and
the inertial forces. As the vertical baffle height increases continuously, the rolling motion of the
liquid becomes slightly weaker due to the blockage effects of the baffles on the liquid
convection. Additionally, the free surface behavior is getting stable and the inertial forces are
not enough to propel the liquid to reach to the top wall of the tank as shown in Fig. 9, Fig. 10
and Fig. 11.
In the snapshots of the velocity vectors for one period (T) of the rolling motion of the tank for
the various hB / h, the velocity vectors near the left wall moves upward after the liquid impacts
on the left wall. The vortex almost starts to form left behind the vertical baffle and T-shape
baffle represents the shallow water effects. At this instant, the liquid shows the roof impact on
the left top corner of the tank. This pattern is almost a reverse result when the tank moves right
side.
As the vertical baffle height increases, the blockage effect of the vertical baffle on the liquid
convection is predominant to the tip vortex. the strength of the vortex by liquid flow separation
from the vertical baffle tip become weaker. The value of the maximum free surface elevation
also keeps decreasing.

(a) (b)

GiDB|DERGi Sayı 1, 2014