This tutorial has demonstrated how a water-filled, land-based tank can be modelled and analysed in AquaSim using membrane type Shell and the Close Compartment load formulation.

A cylindrical tank with a flat bottom was generated using the Generate Net option and positioned in air by placing the baseline at z = 0 or above. Shell properties were assigned to both the side walls and the bottom, and the internal water was defined through the enclosed volume parameters — specifying fluid density, fill height, and free surface area. Fixed boundary conditions were applied at the base nodes to represent a rigid foundation, while the rim nodes were released horizontally and rotationally to reflect realistic top-edge conditions.

The static analysis results confirm that the internal pressure distribution follows the expected hydrostatic pattern, with pressure increasing linearly from zero at the free surface to a maximum at the tank base. The Von Mises stress results provide a basis for structural assessment of the tank wall and bottom under the applied water load.

Although this tutorial covers a simple, unstiffened tank, the same modelling approach can be extended to more complex configurations. Additional structural details, such as stiffened panels, composite cross-sections, or partial fill levels, can be introduced using standard elements available in AquaSim.