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Tytuł:
Numerical analysis of open channel steady gradually varied flow using the simplified Saint-Venant equations
Autorzy:
Artichowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1934022.pdf
Data publikacji:
2011
Wydawca:
Politechnika Gdańska
Tematy:
dynamic equation
open-channel flow
open-channel networks
steady flow
Opis:
For one-dimensional open-channel flow modeling, the energy equation is usually used. There exist numerous approaches using the energy equation for open-channel flow computations, which resulted in the development of several very efficient methods for solving this problem applied to channel networks. However, the dynamic equation can be used for this purpose as well. This paper introduces a method for solving a system of non-linear equations by the discretization of the one-dimensional dynamic equation for open-channel networks. The results of the computations using the dynamic and energy equations were compared for an arbitrarily chosen problem. Also, the reasons for the differences between the solution of the dynamic and energy equation were investigated.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2011, 15, 3-4; 317-328
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lagrangian Model for a Single Saltating Grain in the Near-Wall Region of an Open-Channel Flow
Autorzy:
Czernuszenko, W.
Powiązania:
https://bibliotekanauki.pl/articles/241181.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
Lagrangian model
open-channel flow
particle-particle interaction
Opis:
A mathematical model for the continuous saltation of a particle near the granular bed in an open-channel flow is developed in detail. The model is based on the Lagrangian equations governing particle motion, and it takes into account the following forces: drag, lift, gravitation, virtual mass and the force responsible for particle-particle interactions. A model of particle-particle collisions is developed and used to determine the mean impulsive force acting upon a particle flowing and rebounding from the channel bed. The model can simulate the continuous saltation trajectories of a single particle in the near-bed region of turbulent flows, in which particle motion is controlled by collisions. The model has been calibrated and verified with available published data in a rather wide range of grain sizes from 0.53 mm to 15 mm. All parameters, such as lift, drag, restitution, friction coefficients and roughness height, have been set on the basis of a reanalysis of these published data.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2013, 60, 1-4; 31-50
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Analysis of Relations Between Coherent Turbulent Structures and Formation of Bedforms
Autorzy:
Termini, D.
Sammartano, V.
Powiązania:
https://bibliotekanauki.pl/articles/241077.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
open channel flow
sediment transport
bed forms
flow turbulence structure
Opis:
The present paper describes an experimental investigation on the interactions between flow turbulence and sediment motion. During the experiments, detailed measurements of flow velocity components were carried out using an Acoustic Doppler Velocimeter (ADV). The occurrence of turbulent events (inward interaction, ejection, sweep and burst) was verified through conditioned quadrant analysis. The quantitative information on the spatial and temporal evolution of turbulent events was obtained through space-time correlations of the conditioned data. As the primary objective was to analyse how turbulent structures influence formation of bedforms, the spatial scale of turbulent event evolution has been compared with the wavelength of bed-forms (alternate bars) observed on the bed. The analysis has essentially highlighted that such spatial scale compares well with the wavelength of the bars.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2008, 55, 3-4; 125-143
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lax-Wendroff and McCormack Schemes for Numerical Simulation of Unsteady Gradually and Rapidly Varied Open Channel Flow
Autorzy:
Machalińska-Murawska, J.
Szydłowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/973864.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
open channel flow
mathematical modeling
numerical simulation
FDM schemes
Opis:
Two explicit schemes of the finite difference method are presented and analyzed in the paper. The applicability of the Lax-Wendroff and McCormack schemes for modeling unsteady rapidly and gradually varied open channel flow is investigated. For simulation of the transcritical flow the original and improved McCormack scheme is used. The schemes are used for numerical solution of one dimensional Saint-Venant equations describing free surface water flow. Two numerical simulations of flow with different hydraulic characteristics were performed – the first one for the extreme flow of the dam-break type and the second one for the simplified flood wave propagation problem. The computational results are compared to each other and to arbitrary solutions.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2013, 60, 1-4; 51-62
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation of open channel flow between bridge piers
Autorzy:
Szydłowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1934025.pdf
Data publikacji:
2011
Wydawca:
Politechnika Gdańska
Tematy:
numerical simulation
open channel flow
mathematical modeling
bridge piers
Opis:
Free-surface flow in the vicinity of bridge piers on a fixed channel bed is a classical problem of open-channel hydraulics. This problem is usually analyzed using one-dimensional hydraulic models for steady-flow problems. The aim of this paper is to present a two-dimensional numerical simulation of water flow around obstacles, such as cylinders, which can act as a simplified model of real piers. The depth-averaged Navier-Stokes equations describing unsteady free-surface flow are solved using an explicit scheme of the finite-volume method. The numerical solution prepared for the simulations of unsteady free-surface flows was used here to analyze the case of steady flow. A numerical simulation of flow in the channel with the obstruction was performed for two different inflow discharges determining, respectively, the subcritical and supercritical flow in the cross-section of a channel constriction. In the second simulation, a hydraulic jump was observed downstream of the bridge section. The numerical results were compared with measurements. Water surface profiles were measured for both discharges in the hydraulic laboratory of the Faculty of Civil and Environmental Engineering at Gdansk University of Technology (GUT). Comparisons with laboratory data showed that the proposed approach constitutes a sufficiently accurate and reliable technique for predicting basic flow parameters. The method of two-dimensional modeling of flow in a river channel between bridge piers can be also integrated with the simulation of unsteady flood wave propagation, ensuring a uniform approach to the problem of flood modeling in river valleys. Moreover, a two-dimensional simulation yields detailed information about flow structure near the obstruction, which can be used to better elucidate debris transport and river bed deformation processes.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2011, 15, 3-4; 271-282
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Modelling of Fish Passage with Turning Pools
Autorzy:
Maniecki, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/241474.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
open channel flow
fishway
turbulence
numerical model
turning pool
Opis:
An assessment of operating conditions in a baffled fish passage with pool dimensions of 2:2 3:0 m, and 180 horizontally turning pools, was carried out using numerical computations and a site survey of water flow velocity distribution. Velocity was measured with a PMS electromagnetic flowmeter and a hydrometric current meter in representative cross-sections of the fish passage in the pool centres and in the baffle barrier cross-section area. Numerical computations were also performed for two alternative baffle locations in the fishway. One reflected the actual conditions, and the other was an alternative arrangement designed to improve hydraulic conditions for fish migration. The numerical model used the Large Eddy Simulation (LES) method, which makes it possible to detect large vortexes. The study pays close attention to the velocity field analysis as well as the distribution and sizes of vortexes in the turning pool of the culvert. The results of numerical computations and the site survey show high consistency, and the proposed baffle placement modification significantly improves flow conditions, especially in the entry section of the passage.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2018, 65, 1; 41-66
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Analysis of Horizontal Turbulence of Flow over Flat and Deformed Beds
Autorzy:
Termini, D.
Powiązania:
https://bibliotekanauki.pl/articles/241285.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
open-channel flow
flow turbulence structure
burst cycle
bed forms
laboratory experiments
Opis:
Laboratory experiments in a straight flume were carried out to examine the evolution of large-scale horizontal turbulent structures under flat-bed and deformed-bed conditions. In this paper, the horizontal turbulence of flow under these conditions is analyzed and compared. The conditioned quadrant method is applied to verify the occurrence of turbulent events. The distributions of horizontal Reynolds shear stress and turbulent kinetic energy are also presented and discussed. Results show the occurrence of an “initial” sequence of horizontal vortices whose average spatial length scales with the channel width. Under deformed-bed conditions, this spatial length does not change.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2015, 62, 3-4; 77-99
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A turbulence model for 3-d flows with anisotropic structure of turbulence
Autorzy:
Czernuszenko, W.
Rylov, A.
Powiązania:
https://bibliotekanauki.pl/articles/241364.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
3D flow
mathematical model
numerical simulation
open channel flow
turbulence model
Opis:
A new turbulence model for flows in open channels with compound cross-sections is presented. The structure of turbulence in these channels can be anisotropic. This structure is described by the turbulent stress tensor that is presented here as the sum of two tensors, namely, normal and shear stress tensors. The normal and shear turbulent stresses are expressed by the turbulence intensities and the mixing length tensor (MLT), respectively. The turbulence intensities can be learned from measurements or another suitable approaches. One such approach that allows calculating the main component of the normal stresses is presented in the paper. The components of MLT are defined based on a new concept of generic mixing length (GML). The generic mixing length is assumed to depend on both distances; from the nearest wall and from the water surface. To demonstrate how the new model works the basic hydrodynamic equations (parabolic approximation of Reynolds equations) together with the turbulence model are solved. The well-known Patankar and Spalding (1972) algorithm was used when solving these equations. A series of numerical simulations were performed for different components of MLT and different channel geometries.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2005, 52, 4; 303-320
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydraulic Loss Coefficients in 1D Flows
Autorzy:
Sawicki, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/241418.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
hydraulic loss
closed-conduits flows
water hammer
open channel flow
Opis:
Determination of hydraulic losses is a very important problem, both from the cognitive and practical points of view. For the uniform and steady fluid streams these losses are described by the well known algebraic expressions, containing some experimental coefficients. In technical practice it is commonly assumed, that these coefficients can be applied also for more complex kinds of flow (non-uniform and even unsteady). However, the problem analysis shows that the proper level of conformity between the results of calculations and measurements can be obtained only after a considerable enlargement of the loss coefficient. Investigation of available characteristics of non-uniform and unsteady 1D velocity fields, presented in this article, leads to the conclusion that this enlargement is physically justified and in some cases it is possible to determine correction factors, which enable recalculation of "basic" coefficients into their new values, suitable for more complex models of 1D flows.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2007, 54, 2; 95-116
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of cumulants to flow routing
Autorzy:
Romanowicz, Renata J.
Doroszkiewicz, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/108562.pdf
Data publikacji:
2019
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
open channel flow
linearized St. Venant equation
analytical solutions
moments
cumulants
Opis:
This paper aims to fill a gap between present and past research approaches to modelling flow in open channels. In particular, a history of the analytical solutions of a linearized St. Venant equation is presented. A solution of the linearized St. Venant equation, describing the response of a river channel to a single impulse forcing, the so called Instantaneous Unit Hydrograph (IUH), can be described using cumulants, defined as the moments of a logarithm of a variable. A comparison of analytical and numerical solutions of flood wave propagation under various flow conditions is given. The river reach of Biała Tarnowska is used as an illustration of both approaches. A practical application of simplified solutions to the emulator of a flood wave propagation is suggested showing a link between theory and practice.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2019, 7, 1; 15-21
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study on two dimensional distribution of streamwise velocity in open channel turbulent flows with secondary current effect
Autorzy:
Mohan, S.
Kundu, S.
Ghoshal, K.
Kumar, J.
Powiązania:
https://bibliotekanauki.pl/articles/38616700.pdf
Data publikacji:
2021
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
velocity distribution
open channel flow
turbulent flow
RANS equations
secondary current
finite difference method
Opis:
For studying mechanism of sediment transport in river flows, open channel flow is a prototype. Flow has always three components of velocity for all types of channel geometry and for a time independent uniform flow along streamwise or main flow direction, all the components of velocity are functions of lateral and vertical coordinates. The present study investigates the two dimensional distribution of streamwise (or longitudinal) velocity starting from the Reynolds averaged Navier–Stokes equation for a turbulent open channel flow which is steady and uniform along the main flow direction. Secondary flows both along the vertically upward direction and along the lateral direction are considered which are also taken as functions of lateral and vertical coordinates. Inclusion of the secondary current brings the effect of dip phenomenon in the model. The resulting second order partial differential equation is solved numerically. The model is validated for all the cross-sectional, transverse and centreline velocity distribution by comparing with existing relevant set of experimental data and also with an existing model. Comparison results show good agreement with data as well as with the previous model proving the efficiency of the model. It is found that the transverse velocity distribution depends on the formation of circular vortex in the cross-sectional plane and becomes periodic as the number of circular vortex increases for increasing aspect ratios.
Źródło:
Archives of Mechanics; 2021, 73, 2; 175-200
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Study of Flow Characteristics of Mobile Fans under Real Operating Conditions (Case Study)
Badania eksperymentalne charakterystyk przepływowych mobilnych wentylatorów w rzeczywistych warunkach pracy (studium przypadku)
Autorzy:
Kaczmarzyk, Piotr
Noske, Rafał
Janik, Paweł
Krawiec, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/35009181.pdf
Data publikacji:
2022
Wydawca:
Centrum Naukowo-Badawcze Ochrony Przeciwpożarowej im. Józefa Tuliszkowskiego
Tematy:
Positive Pressure Ventilator
PPV
mobile fan
full scale experiment
open flow
air flow rate
wentylator nadciśnieniowy
wentylator mobilny
eksperyment na pełną skalę
przepływ otwarty
natężenie przepływu powietrza
Opis:
Aim: The aim of this article is to evaluate the effect of selected positioning parameters of the fan (positioning distance and impeller angle) on the ability to pump a volumetric airflow stream through a construction object. Method design: Mobile fans used during rescue operations are an important tool to reduce the spread of smoke during interior fires in buildings. Due to the nature of the use of these devices, the characteristics that determine their performance should be tested using test methodologies with characteristics similar to their actual conditions of use. The article presents the author's method for studying the volumetric flow rate of air. In addition, a flow resisting curtain (FRC) test stand for determining flow characteristics in real building systems was presented. The flow tests were carried out at a facility with a volume of 282 m3, which is a training room of the Scientific and Research Centre for Fire Protection – National Research Institute. Results: As part of the performed research, the flow characteristics for the mobile fan sample were determined. The completed tests showed that the fan pumped a volumetric flow rate ranging from 2471 to 17997 m3/h. It was determined that the most favourable positioning distance of the tested fan calculated from the inlet opening to the room is 5 meters. At this distance, the highest values of volumetric flow rate were obtained for both studied slope angles – 0 and 8° (recorded values are 17298 and 17997 m3/h, respectively). Conclusions: Proper positioning of the mobile fan has a significant impact on the amount of airflow pumped through the building. The positioning parameters of the mobile unit are, respectively, the mechanism for changing the angle of the air supply and its mobility – the ability to move to another location. This article presents the results of a test of the volumetric flow characteristics of an air jet generated by a mobile fan. The test results showed that the parameters of fan positioning have a significant impact on the effectiveness of tactical mechanical ventilation during rescue operations. Observations made during the tests indicate that it is reasonable to implement requirements for the mandatory use of information boards showing the optimal positioning parameters for mobile units to achieve the highest possible expenditure.
Cel: Celem artykułu jest ocena wpływu wybranych parametrów pozycjonowania wentylatora (odległości ustawienia i kąta nachylenia wirnika) na zdolność do przetłaczania objętościowego strumienia przepływu powietrza przez obiekt budowlany. Projekt metody: Mobilne wentylatory wykorzystywane podczas działań ratowniczych stanowią ważne narzędzie pozwalające ograniczyć rozprzestrzenianie się dymu podczas pożarów wewnętrznych obiektów budowlanych. Z uwagi na charakter wykorzystania tych urządzeń, cechy warunkujące ich skuteczność działania powinny być poddane badaniom z wykorzystaniem metodyk badawczych o charakterystyce zbliżonej do ich rzeczywistych warunków stosowania. W artykule przedstawiono autorską metodę badań objętościowego strumienia przepływu powietrza. Ponadto zaprezentowane zostało stanowisko badawcze FRC (ang. flow resisting curtain) przeznaczone do wyznaczania charakterystyk przepływowych w rzeczywistych układach obiektów budowlanych. Badania przepływowe wykonano na terenie obiektu o kubaturze 282 m3 stanowiącego salę szkoleniową Centrum Naukowo- -Badawczego Ochrony Przeciwpożarowej – Państwowego Instytutu Badawczego. Wyniki: W ramach wykonanych badań określona została charakterystyka przepływowa dla próbki mobilnego wentylatora. W wyniku zrealizowanych testów wykazano, że wentylator przetłoczył objętościowy strumień w zakresie od 2471 do 17997 m3/h. Stwierdzono, że najkorzystniejsza odległość pozycjonowania badanego wentylatora liczona od otworu wlotowego do pomieszczenia wynosi 5 metrów. Przy tej odległości uzyskano największe wartości objętościowego strumienia przepływu dla obu zbadanych kątów nachylenia – 0 i 8° (odnotowane wartości to odpowiednio 17298 i 17997 m3/h). Wnioski: Odpowiednie ustawienie mobilnego wentylatora ma znaczący wpływ na wielkość tłoczonego strumienia powietrza przez obiekt budowlany. Parametrami pozycjonowania mobilnej jednostki są odpowiednio mechanizm zmiany kąta nawiewu oraz jego mobilność – możliwość przeniesienia w inne miejsce. W artykule przedstawiono wyniki badań charakterystyki przepływu objętościowego strugi powietrza generowanej przez mobilny wentylator. Uzyskane rezultaty testów wykazały, że parametry pozycjonowania wentylatora mają znaczący wpływ na efektywność działania taktycznej wentylacji mechanicznej podczas działań ratowniczych. Obserwacje przeprowadzone w trakcie testów wskazują na zasadność wdrożenia wymagań dotyczących obowiązku stosowania tablic informacyjnych przedstawiających optymalne parametry pozycjonowania mobilnych jednostek pozwalające osiągnąć możliwie największy wydatek.
Źródło:
Safety and Fire Technology; 2022, 60, 2; 104-117
2657-8808
2658-0810
Pojawia się w:
Safety and Fire Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Koncepcja stanowiska do badania wypływu zanieczyszczeń z kanałów burzowych
Concept of an experimental stand for study the outflow of pollutants from combined sewer overflows
Autorzy:
Rząsa, M. R.
Boguniewicz-Zabłocka, J.
Powiązania:
https://bibliotekanauki.pl/articles/268350.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
przepływ w kanale otwartym
przepływ dwufazowy
komputerowa analiza obrazu
open channel flow
two-phase flow
computer image processing
Opis:
Pomiary przepływu mieszaniny polidyspersyjnej są jednymi z najtrudniejszych do zrealizowania w warunkach technicznych. W artykule opisano koncepcję systemu pomiarowego, który umożliwi obserwację przepływającej mieszaniny oraz wyznaczenia podstawowych parametrów jej ruchu. W pracy zaproponowano sposób opisu wydmy przesuwającego się piasku. Wymiary wydmy zdefiniowano za pomocą czterech charakterystycznych wymiarów. Zaproponowano stanowisko laboratoryjne umożliwiające badanie przepływu mieszaniny w kanale otwartym przy różnym nachyleniu kanału i różnym składzie granulometrycznym frakcji stałej. Stanowisko wyposażono w system rejestracji obrazu. Obrazy zarejestrowane kamerą poddawane są procesowi komputerowej analizy obrazu i na tej podstawie możliwe jest określenie podstawowych parametrów ruchu mieszaniny. Praca zawiera opis koncepcji stanowiska laboratoryjnego oraz ideę metody analizy obrazu.
A storm water system with open channels for the discharge of rainwater exists in most urbanised areas. The flow in these kind of channels is generally multiphase flow, in which there are solids and liquids and in some places there may be an additional gas phase. Therefore the ability to describe such flow is reduces to the description of the motion of the polydisperse mixture. Polydisperse mixture flow measurements are among the most difficult to achieve in technical terms. The article describes the concept of a measurement system that allows observation of the poly-dispersed flow and determine the basic parameters of its motion. Concept of experimental laboratory set-up was proposed to measure the parameters of the polydispersed mixture flow process in open channel with different slope of the channel and various granulometry of the solid fraction. In this work description of sand dunes with four typical parameters was proposed. A digital camera is used to interrogate the flow. Images recorded on the camera will be subjected to a process of image analysis, and from this the basic parameters of the movement are determined. The work includes a description of the experimental set-up with the idea of image analysis methods.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2015, 47; 155-158
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Boundary problem for equations of steady gradually varied flow in open channels
Autorzy:
Szymkiewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/241107.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
differential equations
steady flow
gradually varied flow
open channels
Opis:
In this paper the problem of solution of ordinary differential equations describing a steady, gradually varied flow is discussed. It is shown that, apart from the initial problem usually solved for open channels, the formulation of the boundary problem is necessary when water levels are imposed at ends of channel. This approach is the mathematically correct formulation of the solution problem for steady, gradually varied flow equations. It enables us to determine directly the water profile and discharge for a single channel, as well as for channel network, instead of the trial and error method usually used. Moreover the formulation of boundary problem with respect to the Manning coefficient and lateral inflow is presented. To solve the listed problems the finite differences method is used.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2001, 48, 4; 23-37
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a bicriteria optimal production plan
Autorzy:
Kuchta, D.
Powiązania:
https://bibliotekanauki.pl/articles/970401.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
production schedule
makespan
flow shop
open shop
Opis:
The classical mathematical programming problem used for the determination of a production plan maximising total income or profit is complemented with a second objective, concerning the makespan of the products being manufactured on two machines. As a result, a bicriterial integer linear programming problem is obtained, which can be solved by means of classical methods. A computational example is presented and discussed.
Źródło:
Control and Cybernetics; 2007, 36, 2; 357-366
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

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