The Brake Water under Current Action. A Distortional
Professor Dumitru Dinu
Marine Engineering Department
Constantza Maritime University
104 Mircea Street, 900663 Constantza, Romania
Abstract: In many cases, it is very difficult to
represent the phenomena in one scale. For long conduit
(pipe-lines, gas transport tubes, long brake water) we
use a great scale for length. If we use the same scale
for diameter or breadth, it results a very thin line.
That’s why it is necessary to use a different scale for
diameter or breadth in our case, a small one. By
applying the similitude criterions, we obtain other
scales for physical magnitudes. Are there near the real
values? What are the differences between the two
approaches: one scale and two scales?
In the paper we propose to use the FLUENT program to
make a comparison between the results of application
normal similitude and distortional similitude in the
experiments regarding current action on the brake water.
First, we established the model law, taking into account
the physical magnitudes which influence the analyzed
phenomena. After, we calculated the scales of these
physical magnitudes for normal similitude (one
geometrical scale) and distortional similitude (two
geometrical scales). Using FLUENT we determined the
values of the forces acting on the brake water, putting
the pressure parameters and the dimensions of the
conduit according to the two cases of similitude.
Finally, we compare the "experimental" results with
theoretical results, calculated by application of scale
of physical magnitudes.
Brief Biography of the Speaker:
Professor Dumitru DINU was born in Constantza in 1948.
He graduated University of Galatzi and obtained the
degree of Diplomat Engineer, Naval Architect. He is
doctor in Fluid Mechanics.
Courses in France on Marine Technology, Deep Diving
Systems; Courses in Romania on Marine Pollution, Marine
Engineering; IMO Courses, etc;
Recognition as Supervisor of doctoral theses since 2001.
He worked as researcher in Romanian Marine Research
Institute (1972-1986) and Chief of Marine Technology
Laboratories (1986 – 1990).
Between 1993 and 2004 Professor Dinu was Rector of
Constantza Maritime University.
Key qualifications: Fluid Mechanics, Marine
Technologies, Marine Pollution, Maritime Education and
International Position: Member CIESM (Conseil
International pour Exploitation Scientifique de la Mer
Mediteranee), Member of IMLA Committee (International
Maritime Lecturers Association), Romania and IMLA
representative at IMO Assembly, Chairman in various
conferences on MET (Maritime Education and Training).
Scientific activities: 9 books on underwater
technologies, hydrodynamics, marine pollution; over 50
papers published on marine technologies, marine
pollution, maritime education and training; certificates
for inventions and innovations; research contract