| Περίληψη: | This thesis focuses on the simulation of liquid sloshing problems in flexible
tanks using the ABAQUS/EXPLICIT software, utilizing the smoothed particle
hydrodynamics (SPH) and finite element methods (FEM) to model the fluid and solid
parts respectively. The simulations involve complex and violent free surface flows with
both rigid and deformable structures.
The paper begins by presenting theoretical chapters on the importance of
sloshing studies and modeling, as well as separate chapters for presenting the SPH and
FEM methods for simulating fluids and solids, respectively. SPH-FEM coupling
formulation methods are also presented before the various simulation results to test
different phenomena. Rigid tank simulations are performed initially to validate the SPH
model's ability to simulate free surface flows accurately and its ability to demonstrate
the free surface return to its original position due to viscosity damping inside the liquid.
The simulations are then extended to investigate the sloshing of the tank in
sinusoidal excitation at different frequencies to detect the occurrence of resonance and
changes in contact forces and pressures in the tank walls due to different frequencies.
Impact simulations are also presented to evaluate the effect of the impact velocity of
the fluid on the contact pressure on the tank’s walls.
Finally, complete fluid-structure interaction (FSI) problem simulations are
performed using deformable shell elements for the tank walls, and the effect of the
shell’s thickness on the tank stress and deformation outputs will be studied to
investigate the occurrence of resonance phenomena due to the change of the system's
natural frequency. Overall, this paper aims to provide insights into sloshing behavior in
flexible tanks and improve the accuracy of sloshing simulations by coupling SPH and
FEM methods.
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