Dynamic Stability of Plane Free Surface of Liquid in Axisymmetric Tanks

Table 1

Slosh frequencies (rad/s) in axisymmetric tanks.

Mode	Cylindrical tank		Annular cylindrical tank
	Present FEM	Theory	Present FEM	Theory
𝑛 = 1	3.4304	3.4298	2.9827	2.9822
𝑛 = 2	6.8235	6.8158	6.4865	6.4828
𝑛 = 3	8.6915	8.6646	8.6211	8.6036
𝑛 = 4	10.2111	10.1484	10.3933	10.3449