Name: Danilo de Almeida Barbosa
Type: PhD thesis
Publication date: 12/03/2018
Advisor:

Namesort descending Role
Julio Tomás Aquije Chacaltana Advisor *

Examining board:

Namesort descending Role
Diogo Costa Buarque Internal Examiner *
Edmilson Costa Teixeira Internal Examiner *
Julio Tomás Aquije Chacaltana Advisor *
RIGOBERTO ELEAZAR MELGAREJO MORALES External Examiner *
Roger Matsumoto Moreira External Examiner *

Summary: The increasing exploitation of offshore oil and consequent increase in the number of
FPSO platforms and vessels to transport this fluid requires increasing attention to the
effects produced by the free surface oscillation in transport tanks and storage of
liquid petroleum and liquefied gas. In this thesis, a study on the impacts on the
sidewalls of rectangular containers provoked by sloshing is proposed. For this task
we recovered three experimental tests carried out by distinct authors of which two
simulated in a reduced scale the behavior of tanks under the action of horizontal
forces and a third the movement of pitch with the tank on an inverted pendulum type
platform. The quantitative and qualitative data of the hydrodynamic pressure on the
edges were collected from transducers installed on the walls of the containers. These
data were used to validate the proposed model that reproduced with good quality the
profile of the flow as well as the hydrodynamic loading in all the scenarios. Our model
was based on the Lagrangian method of free particles (mesh free) known as
SMOOTHED PARTICLE HYDRODYNAMISC - SPH, which in its genuine form for
incompressible fluid flow makes use of the force from the Lennard-Jones potential to
keep the particles inside the domain. Contributions to the method were also made: as
the alteration in the search system of neighboring particles; propose a relation
between the numbers of virtual particles and smoothing length; and pointing to an
"optimal number" of contour particles. However, the most relevant contribution was
the creation of a new contour treatment technique using the COULOMB FORCE,
which proved to be more robust than the classical technique. The mathematical
modeling passed through the equations of mass conservation and conservation of
linear momentum. With this, simulations with different geometries were made and
after identification of the causes and effects produced by sloshing, suppression
mechanisms were installed inside the tanks. The tests followed with baffles of two
different heights and with arrow-shaped deflectors acting as fins. All the baffles were
efficient in reducing the normal stresses, however, those in the arrow shape
presented superior to the standard vertical baffles, indicating that a suitable
morphology can reduce the damages generated by sloshing.

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