- Type of paper
: Paper in book
Title: Towards Complete Shape Optimization of Francis Turbine
Spiral Casing
- Authors:
- Sopta, Luka (74085)
- Mrša, Zoran (32573)
- Editors
- Wagner, S
- Hirschel, E.H.
- Periaux, J
- Piva, R.
Publisher: John Wiley & Sons Ltd
ISBN: 0 471 950637
Year: 1994
Pages: from 1025 to 1029
Number of references: 14
Language: engleski
Summary: Method for the shape optimization of Francis turbine
spiral casing is proposed. The method uses incompressible potential flow
model and finite elements for flow analysis. The shape of the spiral casing
is parametrized with a finite number of parameters and the object function
becomes a function of finite number of variables. Minimization of the
object function with the conjugate gradient method gives a solution of this
shape optimization problem.
Keywords: shape optimization, conjugate gradient method, finite elements method, potential flow, Francis turbine spiral casing design
- Type of paper
: Paper in book
Title: Turbomachinery Spiral Casing Optimum Design
- Authors:
- Mrša, Zoran (32573)
- Sopta, Luka (74085)
Year: 1995
Number of references: 15
Language: engleski
Summary: This paper presents the shape optimization method for
turbomachinery spiral casing design. The method consists of the finite
element compressible potential flow solver and constraint conjugate
gradient optimizer. The efficency of the method is improved by the domain
decomposition technicque. The goal, the circumferentialy constant
distribution of the spiral casing outflow velocities is achieved by finer
shape parametrization of the tongue and its neighbourhood.
Keywords: shape optimization, conjugate gradient method, domain decomposition, finite element method, potential flow, Francis turbine spiral casing design
Other: Knjiga će biti izdana 15.10.1995. Tada će biti poznati svi
potrebni podaci.
- Type of paper
: Paper in journal
Title: Convergence Analysis of Finite Element Method for Francis
Turbine Spiral Casing Flow Simulation
- Authors:
- Mrša, Zoran (32573)
Journal: Elektrotechnik und Informationstechnik
Number: 6
ISSN: 0932-383x
Volume: 111
Year: 1994
Pages: from 321 to 324
Language: engleski
Summary: The flow in the spiral casing of a Francis turbine is
modelled by potencial flow using finite element model. Software was
developed for mesh generation, model solution, pre- and postprocessing. The
rate of convergence, measured in outflow velocity angle convergence, was
tested numerically. For accuracy of 2% between two succesive mesh
refinements not more then 5 elements in radial and 3 in axial direction are
needed, while the number of elements in circumferential direction was kept
unchanged.
- Type of paper
: Paper in journal
Title: Hydraulic Turbomachinery Power Equation
- Authors:
- Mrša, Zoran (32573)
Journal: Bulletins for Applied Mathematics
Number: 964
ISSN: 0133-3526
Volume: 71
Year: 1994
Pages: from 41 to 51
Number of references: 5
Language: engleski
Summary: The equation for the power given by incompressible
fluid to the hydraulic turbomachine with constant speed of rotation of
impeler is derived. starting with the law of change of kinetic energy for
the fluid body contained in stream tube surrounding impeler in two
different coordinate systems we arrive at the final form of the equation
where the first part is classical Euler equation of turbomachinery and
aditional parts, depending on the shape of stream tube and instationarity
of the flow.
Keywords: Hydraulic turbomachinery, Power equation, Euler equation
- Type of paper
: Paper in journal
Title: Numerical Modelling of Hydraulic Transients in
Hydroelectric Power Plants
- Authors:
- Sopta, Luka (74085)
- Vuković, Senka
Journal: Bulletins for Applied Mathematics
ISSN: 0133-3526
Year: 1995
Language: engleski
Summary: The numerical model for transient states of water in a
pipeline of a hydroelectric plant is presented. The fundamental idea is
that theese transients are superposition of two phenomena. This leads to a
nonlinear initial - boundaty value problem to which we apply the method of
characteristics. The implementation of this model in our simulation program
gives good results as it can be seen from the comparison between computed
and measured data.
- Type of paper
: Paper in proceedings
Title: Finite Element Modelling of Laminar Flow of Incompressible
Viscous Fluid with Discretization of Directional Derivative
- Authors:
- Mrša, Zoran (32573)
- Editors
- Sorić, Jurica
- Vranković, Nikola
Proceedings title: Zbornik radova 1. Kongresa Hrvatskog društva za mehaniku
Language: engleski
Place: Zagreb
Year: 1994
ISBN/ISSN: 953-96243-0-4
Pages: from 430 to 438
Meeting: Prvi kongres Hrvarskog društva za mehaniku
Held: from 07/14/94 to 07/17/94
Summary: The finite element method has been developed for
laminar flow modelling of incompressible viscous fluid utilizing
quadrilateral isoparametric elements. The Galerkin weighted residual method
has been chosen with discretization of directional derivative of velocita.
Two test cases for lid driven cavity flow, for low and high Reynolds
numbers are solved. The results compare well with published ones.
Keywords: Finite elements, Fluid flow modelling, Navier-Stokes equation, Directional derivative discretization, Quadrilateral elements
- Type of paper
: Paper in proceedings
Title: Volume rate calculation of fresh air supply system in TE
Rijeka power plant
- Authors:
- Sopta, Luka (74085)
- Mrša, Zoran (32573)
- Editors
- Franković, Bernard
Proceedings title: Zbornik radova Međunarodnog kongresa "Energija i zaštita čovjekova okoliša"
Language: engleski
Place: Rijeka
Year: 1994
ISBN/ISSN: 953-96054-2-3
Pages: from 225 to 229
Meeting: Međunarodni kongres "Energija i zaštita čovjekova okoliša"
Held: from 10/26/94 to 10/28/94
Summary: The velocity fields of fresh air flow at the entrance
of a ventilation system, in front of fans, working separately and together,
were measured using an anemometer and specially chosen raster of points. A
computer program is developed for the calculation of volume rate based on
measured velocities. At the same time, the pressure at three different
cross-sections, in front of and behind the fans, was measured with
differential manometer. It is found that the volume rate calculated from
the static pressure measurements is in very good correlation with the
volume rate calculated from the velocity measurements.
- Type of paper
: Paper in proceedings
Title: Three-dimensional modelling of isothermal air flow in
boileres
- Authors:
- Mrša, Zoran (32573)
- Sopta, Luka (74085)
- Editors
- Franković, Bernard
Proceedings title: Zbornik radova Međunarodnog kongresa "Energija i zaštita čovjekova okoliša"
Language: engleski
Place: Rijeka
Year: 1994
ISBN/ISSN: 953-96054-3-1
Pages: from 159 to 166
Meeting: Međunarodni kongres "Energija i zaštita čovjekova okoliša"
Held: from 10/26/95 to 10/28/95
Summary: Isothermal air flow in boilers is three-dimensional
turbulent flow. The k-epsilon turbulence model with appropriate boundary
conditions is used to model the flow. FLUENT software package for personal
computers is applied for numerical simulation. Flows for different angles
of side inflow velocities are analyzed and particle trajectories are
tracked. this is the basic study for combustion modeling in boilers.
- Type of paper
: Paper in proceedings
Title: Aerodynamics of Fluidized Bed Combustion of Unburned Coal
Particles
- Authors:
- Mrša, Zoran (32573)
- Editors
- Melvan, Paško
Proceedings title: Zbornik radova međunarodnog stručno-znanstvenog simpozija "Uvjeti kvalitetne izg
Language: hrvatski
Place: Zagreb
Year: 1994
ISBN/ISSN: 953-6224-01-1
Pages: from 152 to 157
Meeting: Uvjeti kvalitetne izgradnje hrvatskih regija
Held: from 04/22/94 to 04/23/94
Summary: Results of the research of aerodynamics of fluidized
bubbling bed with side distribution of gas, thth is the basis of the new
technology of fluidized bed combustion of unburned coal particles in
boilers is presented. The main idea is to design two-dimensional jet with
greater penetration depth than three-dimensional. The research resulted in
design and construction of pilot plant which prooved new technology to be
economic, safe and stable.
- Type of paper
: Paper in proceedings
Title: Numerical analysis of natural convection of air in tall
laterally heated cavities
- Authors:
- Sopta, Luka (74085)
- Medić, Gorazd
- Editors
- Franković, Bernard
Proceedings title: Zbornik radova Međunarodnog kongresa "Energija i zaštita čovjekova okoliša"
Language: engleski
Place: Rijeka
Year: 1994
ISBN/ISSN: 953-96054-3-1
Pages: from 217 to 224
Meeting: Međunarodni kongres "Energija i zaštita čovjekova okoliša"
Held: from 10/26/94 to 10/28/94
Summary: Modeling of antural convection is very important for
engineering design. This paper presents the results of two-dimensional
numerical analysis of natural convection of air in tall laterally heated
cavities obtained using the adequate commercial software package. The
analysis is carried out calculating the corresponding heat flux for
different widths of cavity (Rayleigh numbers) and the existance of maximum
heat flux is found. The results of this analysis are applied on the natural
convection of air between window glasses.
- Type of paper
: Paper in proceedings
Title: Incompressible potential flow in multy-connected domain
with periodic boundary
- Authors:
- Sopta, Luka (74085)
- Editors
- Sorić, Jurica
- Vranković, Nikola
Proceedings title: Zbornik radova 1. kongresa Hrvatskog društva za mehaniku
Language: engleski
Place: Zagreb
Year: 1994
ISBN/ISSN: 953-96243-0-4
Pages: from 415 to 421
Meeting: Prvi kongres Hrvarskog društva za mehaniku
Held: from 09/14/94 to 09/17/94
Summary: This paper presents decomposition method for the
solution of incompressible potential flow in multy-connected domain with
periodic boudary. Kutta-Joukowsky condition comes as a condition for
determination of arbitrary parameters in multy-connected domain. Finite
element formulation gives linear systems with the same symetric matrix and
the computation costs are equal to the costs of a solution of the linear
system for simply-connected domain.
Keywords: incompressible potential flow, multy-connected domain, Kutta-Joukowsky condition, finite element method
- Type of paper
: Paper in proceedings
Title: Three-dimensional model of natural convection
- Authors:
- Sopta, Luka (74085)
- Medić, Gorazd
- Editors
- Franković, Bernard
Proceedings title: Zbornik tehničkog fakulteta Rijeka god. 14
Language: hrvatski
Place: Rijeka
Year: 1994
ISBN/ISSN: 0353-281x
Pages: from 155 to 164
Summary: In this paper, the possibility of numereical modelling
of a complex phenomena such as three-dimensional ntural convection is
presented. The results obtained with three-dimensional model are compared
with the ones obtained using two-dimensional model, and the additional
effects obtained with three-dimensional model arae emphasised. From the
analysis carried out, fine correlation of results obrtained with
two-dimensional and three-dimensional model is observed in certain
situations, and that assures cheaper and more detailed analysis. On the
other hand, todays software and hardware assure even the efficient
three-dimensional analysis.
Keywords: natural convection, three-dimensional model, control volume method
- Type of paper
: Paper in proceedings
Title: Zbornik Međunarodne konferencije o jadranskom priobalju
- Authors:
- Sopta, Luka (74085)
- Vuković, Senka
- Brnić, Josip
Proceedings title: Zbornik Međunarodne konferencije "Priobalje i podmorje Jadrana"
Language: engleski
Place: Rijeka
Year: 1995
Meeting: Međunarodna konferencija "Priobalje i podmorje Jadrana"
Summary: The modelling and analysis of pressure transients in
pipelines is important for preventing damages and environment pollution in
hydroelectric power plants, ships, off-shore objects etc. This paper
presents a numerical model of pressure transients in a series of pipes with
different boundary conditions imposed by reservoirs, pumps or valves. The
model is tested on known results and applied to the analysis of an oil
containing pipeline with upstream and downstream reservoirs and pumps and
valves connected by series of pipes. The connection between valve closure
time and amplitude and shape of the pressure fluctuation curve is evident
from our results.
Other: Zbornik je još u tisku te stoga nedostaju određeni
podaci.
- Type of paper
: Paper in proceedings
Title: Tidal Propagation in Shallow Waters
- Authors:
- Sopta, Luka (74085)
Proceedings title: Zbornik radova Međunarodne konferencije "Priobalje i podmorje Jadrana"
Language: engleski
Place: Rijeka
Year: 1995
Meeting: Međunarodna konferencija "Priobalje i podmorje Jadrana"
Summary: Today exists a lot of good models for the numerical
simulation of tidal propagation in shallow waters. This paper presents the
special mathematical model for propagation of tidal waves in estuaries.
Numerical solution of the two-dimensional shallow water equations is
achieved by coupling the finite elements with collocation economical model.
The model is tested on the open rectangular channel for which exists the
exact solution. The numerical results are applied to the Massachussetts Bay
and Rijeka Bay
Other: Zbornik je još u tisku te stoga nedostaju pojedini podaci.
- Type of paper
: Paper in proceedings
Title: Global Approach to the Marine Structures Optimization
Using Finite Element Method
- Authors:
- Brnić, Josip
- Sopta, Luka (74085)
Proceedings title: Zbornik radova Međunarodne konferencije "Priobalje i podmorje Jadrana"
Language: engleski
Place: Rijeka
Year: 1995
Meeting: Međunarodna konferencija "Priobalje i podmorje Jadrana"
Summary: This paper deals with aims, problems and methods of
structural optimization. Basic formulations of the marine structures
optimization are considered. Optimum structural design is understood as a
synthesis of several disciplines: design modelling, structural analysis,
behaviour sensitivity analysis, mathematical programming and the
interactive computer graphics. The finite method has been applied to this
optimization process.
Other: Zbornik je još u tisku te su stoga nepoznati određeni podaci.
- Type of paper
: Paper in proceedings
Title: Calculation of Water Discharge in Open Channels
- Authors:
- Sopta, Luka (74085)
Proceedings title: Zbornik radova 40. Jubilarni godišnji skup KoREMA
Language: hrvatski
Place: Zagreb
Year: 1995
Pages: from 207 to 213
Meeting: 40. Jubilarni skup KoREMA
Summary: Flow of water in open channels is turbulent. For
calculation of discharge from measured velocities at the grid points on the
given cross-section, it is necessary to choose interpolation functions from
the theory of turbulent flow. For boundary layer we need the law of the
wall and for the core of the cross-section the defect velocity law. Theese
two laws use the logarythm function. This paper presents the method for
calculation of discharge which uses Coons surfaces with logarythm functions
on the boundary. This method is applied for the analysis of hydraulic
measurement in the HE Senj done in 1994.
Other: Zbornik je još u tisku te su stoga pojedini podaci nepoznati.
- Type of paper
: Paper in proceedings
Title: Computational Fluid Mechanics Influence in Engineering
Design
- Authors:
- Sopta, Luka (74085)
Proceedings title: Zbornik radova Tehnologija i društvo
Language: hrvatski
Year: 1995
Meeting: Tehnologija i društvo
Other: Zbornik je još u tisku te su stoga neki podaci nepoznati
- Type of paper
: Paper in proceedings
Title: Mathematical models of water flow in Rijeka Bay
- Authors:
- Sopta, Luka (74085)
- Editors
- Franković, Bernard
Proceedings title: Zbornik Tehničkog fakulteta Rijeka 13
Language: hrvatski
Place: Rijeka
Year: 1993
ISBN/ISSN: 0353-281x
Pages: from 91 to 108
- Type of paper
: Summary in proceedings
Title: Optimum Guide Vanes Design for the Velicity
Homogeniztation in the Steam Generator
- Authors:
- Mrša, Zoran (32573)
- Sopta, Luka (74085)
- Medić, Gorazd
Proceedings title: Proceedings on the 6th International DAAAM Symposium "Intelligent Manufacturing
Language: engleski
Year: 1995
Meeting: 6th International DAAAM Symposium "Intelligent Manufacturing Systems"
Held: from 10/26/95 to 10/28/95
Summary: This paper presents the optimum guide vanes design for
homogenization of the velocities of burned gases in the Pi-formed bend of
the coal fired steam generator. The computer simulation of turbulent
nonisothermal flow of viscous gas, with different guide vanes geometry,
position and number of guide vanes has been carried out, leading to the
optimum solution with small number of guide vanes.
Other: Zbornik će tek biti u tisku te su stoga nepoznati neki
podaci.
- Type of paper
: Summary in proceedings
Title: The Backward Facing Step Test for Finite Element Model of
Stationary Incompressible Laminar Fluid Flow
- Authors:
- Mrša, Zoran (32573)
- Jurjević, Robert
Proceedings title: Collection of Summaries of the 5th International DAAAM Symposium
Language: engleski
Place: Beč, Austrija
Year: 1994
ISBN/ISSN: 3-901509-00-3
Pages: from 287 to 288
Meeting: 5th International DAAAM Symposium
Held: from 10/27/94 to 10/29/94
Summary: Modelling of laminar flow of incompressible viscous
fluid is of great importance in engineering. Navier-Stokes equations serve
as model equations for turbulence modelling. We apply discretization of
velocity directional derivative in an iterative solution method. For
numerical solution we use Galerkin weighted residual method and finite
approximation with eight node isoparametric elements for velocity
components and four nodes superparametric elements for pressure to avoid
pressure solution oscillations.
- Type of paper
: Computer program
Title: Automatic preprocessor for 20-nodal isoparametric finite
element mesh generation for the Francis turbine spiral casing
- Authors:
- Sopta, Luka (74085)
- Mrša, Zoran (32573)
Odering party: Turboinštitut Ljubljana
Institution depot: Turboinštitut Ljubljana
HW platform: PC
Operating system: MS-DOS
Programming language: Fortran
Year: 1992
- Type of paper
: Computer program
Title: Finite element numerical model frontal solver
- Authors:
- Mrša, Zoran (32573)
- Sopta, Luka (74085)
Odering party: Turboinštitut Ljubljana
Institution depot: Turboinštitut Ljubljana
HW platform: PC, radna stanica
Operating system: MS-DOS, Unix
Programming language: Fortran
Year: 1993
- Type of paper
: Computer program
Title: Fluid flow numerical simulation graphic results
presentation postprocessor
- Authors:
- Sopta, Luka (74085)
- Mrša, Zoran (32573)
Odering party: Turboinštitut Ljubljana
Institution depot: Turboinštitut Ljubljana
HW platform: PC, radna stanica
Operating system: MS-DOS, Unix
Programming language: Fortran
Year: 1993
- Type of paper
: Computer program
Title: Programm package for hydroelectric power plants transients
computer simulation
- Authors:
- Vuković, Senka
- Sopta, Luka (74085)
Odering party: HEP Sliv Rijeka
Institution depot: HEP Sliv Rijeka
HW platform: PC
Operating system: MS-DOS,Win
Programming language: Turbo C/C++,Visual C/C++
Year: 1995
- Type of paper
: Computer program
Title: Viscous fluid flow finite elements simulation with
discretization of total derivative programm
- Authors:
- Mrša, Zoran (32573)
HW platform: radna stanica
Operating system: Unix
Programming language: Fortran
Year: 1994
- Type of paper
: Computer program
Title: Open channel water flow rate computation programm
- Authors:
- Sopta, Luka (74085)
Odering party: HEP Sliv Rijeka
Institution depot: HEP Sliv Rijeka
HW platform: PC
Operating system: MS-DOS
Programming language: Fortran
Year: 1994
- Type of paper
: Computer program
Title: Fan characteristics graphical presentation programm
- Authors:
- Karabaić, Damir
- Sopta, Luka (74085)
Odering party: HEP, TE Rijeka
Institution depot: HEP, TE Rijeka
HW platform: PC
Operating system: MS-DOS
Programming language: Basic
Year: 1995
- Type of paper
: Survey/Study
Title: Modelling of water flow in Rijeka bay
- Authors:
- Sopta, Luka (74085)
- Legović, Tarzan
Ordering party: JVP Hrvatska vodoprivreda
Institution depot: Podružnica Rijeka
Year: 1993
Number of pages: 51
Language: hrvatski
- Type of paper
: Survey/Study
Title: Analysis of the results of hydraulic measurements in HE
Senj
- Authors:
- Sopta, Luka (74085)
- Mrša, Zoran (32573)
- Medić, Gorazd
- Sopta, David
Ordering party: HEP Sliv Rijeka
Institution depot: HEP Sliv Rijeka
Year: 1994
Number of pages: 249
- Type of paper
: Survey/Study
Title: Aerodynamic analysis of fan and fresh air supply in power
plant TE Urinj
- Authors:
- Sopta, Luka (74085)
- Mrša, Zoran (32573)
- Karabaić, Damir
- Kranjčević, Lado
Ordering party: HEP, TE Rijeka
Institution depot: HEP, TE Rijeka
Year: 1995
Number of pages: 227
- Type of paper
: Survey/Study
Title: Burned gases velocity homogenization in the boiler of TE
Plomin using guide vanes
- Authors:
- Mrša, Zoran (32573)
- Sopta, Luka (74085)
- Medić, Gorazd
- Kranjčević, Lado
Ordering party: HEP, TE Plomin
Institution depot: HEP, TE Plomin
Year: 1995
Number of pages: 100
- Type of paper
: Survey/Study
Title: Hydrodynamic and thermodynamic analysis of combustion in
CO boiler
- Authors:
- Mrša, Zoran (32573)
- Sopta, Luka (74085)
- Medić, Gorazd
- Kranjčević, Lado
Ordering party: INA, Rafinerija Rijeka
Institution depot: INA, Rafinerija Rijeka
Year: 1995
Number of pages: 100
- Type of paper
: Survey/Study
Title: Hydraulic measurements and turbine/pump efficiency
coefficient evaluation in CHE Fužine
- Authors:
- Sopta, Luka (74085)
- Mrša, Zoran (32573)
- Medić, Gorazd
- Sopta, David
Ordering party: HEP Sliv Rijeka
Institution depot: HEP Sliv Rijeka
Year: 1995
Other: Elaborat je još u tisku i stoga su određeni podaci još
nepoznati.
- Type of paper
: Survey/Study
Title: Computer simulation of hydraulic transients in CHE Fužine
- Authors:
- Sopta, Luka (74085)
- Vuković, Senka
Ordering party: HEP Sliv Rijeka
Institution depot: HEP Sliv Rijeka
Year: 1995
Other: Elaborat je još u tisku i stoga su određeni podaci još
nepoznati.
- Type of paper
: Invited lecture
Title: Turbomachinery spiral casing optimal shape design
Institution: Universitat der Bundeswehr Munchen, Institut fur Wasserwessen
Year: 1995
- Type of paper
: Invited lecture
Title: Hydraulic transients in hydroelectric power plants
Institution: Universitat der Bundeswehr Munchen, Institut fur Wasserwessen
Year: 1995
- Type of paper
: Invited lecture
Title: Application of CFD (programm package FLUENT) in combustion
problems and modelling of fluid flow
Institution: Universitat der Bundeswehr Munchen, Institut fur Wasserwessen
Year: 1995
- Type of paper
: Invited lecture
Title: Finite elements in fluid dynamics
Institution: University o Ljubljana, FGG - Hydraulics Department
Year: 1995
- Type of paper
: Invited lecture
Title: Hydraulic transients in hydroenergetic pipeline systems
Institution: University o Ljubljana, FGG - Hydraulics Department
Year: 1995
