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    Wyświetlanie 1-11 z 11
    Tytuł:
    A Comparison of Simplified Two-dimensional Flow Models Exemplified by Water Flow in a Cavern
    Autorzy:
    Prybytak, D.
    Zima, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/241287.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    potential flow
    Stokes flow
    Navier-Stokes flow
    BEM
    OpenFOAM
    Opis:
    The paper shows the results of a comparison of simplified models describing a two-dimensional water flow in the example of a water flow through a straight channel sector with a cavern. The following models were tested: the two-dimensional potential flow model, the Stokes model and the Navier-Stokes model. In order to solve the first two, the boundary element method was employed, whereas to solve the Navier-Stokes equations, the open-source code library OpenFOAM was applied. The results of numerical solutions were compared with the results of measurements carried out on a test stand in a hydraulic laboratory. The measurements were taken with an ADV probe (Acoustic Doppler Velocimeter). Finally, differences between the results obtained from the mathematical models and the results of laboratory measurements were analysed.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2017, 64, 3-4; 141-154
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The prediction of hull gesture and flow around ship based on Taylor expansion boundary element method
    Autorzy:
    Gong, Jiaye
    Li, Yunbo
    Powiązania:
    https://bibliotekanauki.pl/articles/258520.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    TEBEM
    potential flow
    flow field
    hull gesture
    surface pressure
    Opis:
    Based on the potential flow theory and traditional boundary element method (BEM), Taylor expansion boundary element method (TEBEM) is introduced in this paper for the prediction of the flow field around ship, as a result, hull gesture and pressure distribution on hull surface are obtained. By this method, dipole strength of every field point is expanded in Taylor expansion, so that approximately continuous hull and free surface boundary condition could be achieved. To close the new equation system, the boundary condition of tangent velocity in every control point is introduced. With the simultaneous solving of hull boundary condition and free surface condition, the disturbance velocity potential could be obtained. The present method is used to predict the flow field and hull gesture of Wigley parabolic hull, Series 60 and KVLCC2 models. To validate the numerical model for full form ship, the wave profile, the computed hull gesture and hull surface pressure of KVLCC2 model are compared with experimental results.
    Źródło:
    Polish Maritime Research; 2019, 2; 198-211
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation of cushioning problem for blunt bodies using boundary element method
    Autorzy:
    Barjasteh, M.
    Zeraatgar, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/259027.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Air cushion
    compressible potential flow
    water entry
    slamming
    Opis:
    Induced air pressure and resulting free surface profile due to air cushioning layer is studied. The study is mainly focused on 2D blunt circular bodies with constant downward speed. The problem is first solved for the air flow between the body and the free surface of the water. Then the results are employed to solve the problem for the water problem, numerically. Both air and water problem are assumed to be governed by Laplace potential equation. Depending on the induced pressure and velocity of the escaping air flow from cushioning layer, compressibility of the air is also included in the modeling. Gravitational acceleration is also included in the model. An iterative boundary element method is used for numerical solution of both air and water problems. Instantaneous pressure distribution and free surface profile are evaluated for different bodies. The results of calculation for large blunt bodies show that inviscid potential method can fairly approximate the problem for large blunt bodies. Additionally, the behavior of the air pressure for the very blunt body is impulsive and the magnitude of the peak pressure is in order of impact pressure of water entry. The obtained results are compared with analytical method. The comparison shows that as the bluntness of a body increases, the better agreement is concluded.
    Źródło:
    Polish Maritime Research; 2018, S 1; 85-93
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on ship hull optimisation of high-speed ship based on viscous flow/potential flow theory
    Autorzy:
    Zhang, Baoji
    Powiązania:
    https://bibliotekanauki.pl/articles/259772.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    potential flow theory
    CFD
    high speed ship
    ship form optimisation
    Opis:
    In order to quickly obtain practical ship forms with good resistance performance, based on the linear wave-making resistance theory, the optimal design method of ship forms with minimum total resistance is discussed by using the non-linear programming (NLP) method. Taking the total resistance as the objective function (the Michell integral is used to calculate the wave-making resistance and the equivalent plate friction resistance formula is used to calculate the frictional resistance), the hull surface offset as the design variable and appropriate displacement as the basic constraints, and considering the additional constraints, the hull bow shape and the whole ship are optimised, and an improved hull form is obtained. The resistance of the ship before and after optimisation is calculated by the CFD method to further evaluate the resistance reduction effect and performance after optimisation. Finally, an example of optimisation calculation of an actual high-speed ship is given. The obvious resistance reduction results confirm the reliability of the optimisation design method.
    Źródło:
    Polish Maritime Research; 2020, 1; 18-28
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accuracy of Potential Flow Methods to Solve Real-time Ship-Tug Interaction Effects within Ship Handling Simulators
    Autorzy:
    Jayarathne, B. N.
    Ranmuthugala, D.
    Fei, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/117010.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    ship handling
    ship handling simulator
    hydrodynamics
    Computation Fluid Dynamics (CFD)
    potential flow
    ship-tug interaction
    real time
    hydrodynamic interaction effect
    Opis:
    The hydrodynamic interaction effects between two vessels that are significantly different in size operating in close proximity can adversely affect the safety and handling of these vessels. Many ship handling simulator designers implement Potential Flow (PF) solvers to calculate real-time interaction effects. However, these PF solvers struggle to accurately predict the complicated flow regimes that can occur, for example as the flow passes a wet transom hull or one with a drift angle. When it comes to predicting the interaction effects on a tug during a ship assist, it is essential to consider the rapid changes of the tug’s drift angle, as the hull acts against the inflow creating a complicated flow regime. This paper investigates the ability of the commercial PF solver, Futureship®, to predict the accurate interaction effects acting on tugs operating at a drift angle during ship handling operations through a case study. This includes a comparison against Computation Fluid Dynamics (CFD) simulations and captive model tests to examine the suitability of the PF method for such duties. Although the PF solver can be tuned to solve streamline bodies, it needs further improvement to deal with hulls at drift angles.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8 no. 4; 497-504
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    O potrzebie uwzględniania zasysania w praktycznych zagadnieniach filtracji wody podziemnej
    On the need of consideration of suction in practical problems of groundwater filtration
    Autorzy:
    Hauryłkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075852.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    przepływ wody gruntowej
    ssanie
    ujemny potencjał przepływu
    Prawo Darcy
    groundwater flow
    suction
    negative flow potential
    Darcy’s law
    Opis:
    Seven examples of issues have been pointed out, when one should take into account the suction exerting on groundwater by capillary attraction from fine sands or similar other fine soils.
    Źródło:
    Przegląd Geologiczny; 2018, 66, 8; 481--482
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A note on discrete descriptions of water flows in material variables
    Autorzy:
    Szmidt, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/241055.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    potential motion
    vortex flow
    material variables
    discrete integration
    Opis:
    The paper describes the problem of discrete formulation of plane fluid flows in material description. The investigation is confined to chosen cases of stationary potential and vortex motion of an incompressible inviscid fluid within circular domains with perfect boundaries. The paths of fluid particles are obtained by numerical integration of momentum equations within a discrete time space. Brownian type random disturbances are attached to the displacement field obtained by the integration. It has been shown, that the discrete formulation may lead to solutions in which a small distance between two material points may grow to a relatively large value after a finite elapse of time. The last feature of the procedure may be a serious drawback of the discrete formulation in the material variables.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2005, 52, 2; 163-175
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport and logistic potential of the western Ukrainian borderland
    Autorzy:
    Hrytsevych, Volodymyr
    Senkiv, Mariana
    Powiązania:
    https://bibliotekanauki.pl/articles/1201830.pdf
    Data publikacji:
    2017-06-30
    Wydawca:
    Uniwersytet Gdański. Instytut Geografii
    Tematy:
    transport
    logistics
    Western Ukrainian borderland
    freight traffic flow
    index
    potential
    Opis:
    Arrangement of logistic companies over oblasts of the Western Ukrainian borderland is studied and characterised. Main logistic centers within the oblasts are singled out. Availability of subjects of transportation and distributional logistics is studied. Railway and automobile networks are comprehensively assessed. Capacity and peculiarities of railway and automobile freight traffic flows are studied. Customs posts and crossing points at Western Ukrainian State border are described. Methods of numerical evaluation of transport and logistic potential index for borderland oblasts are suggested and index values for the Western Ukrainian borderland oblasts are calculated. Numerical evaluation of transport and logistic index is conducted.
    Źródło:
    Journal of Geography, Politics and Society; 2017, 7, 2; 81-86
    2084-0497
    2451-2249
    Pojawia się w:
    Journal of Geography, Politics and Society
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Current state and prognoses of the structure of cargo transport on Polish and European inland water transport area
    Autorzy:
    Czermanska, R.
    Kowalczyk, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/963458.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    inland water transport
    Europe
    state
    flow of cargo
    potential for development
    Opis:
    The present report was prepared within the framework of research activities carried out in the Maritime Institute in Gdansk, when taking part in the international research project EUREKA E! 3065 INCOWATRANS, the goal of which was working out preliminary designs of new-generation ships for inland and coastal navigation, and preparing technical and economic structure for the revitalisation of inland waterways in Poland, with their further incorporation to the European transportation system. The article aims at analysing the present state and assessing the future potential of cargo routes observed in inland East-West water transport, i.e. between Poland and Western Europe countries.
    Źródło:
    Polish Maritime Research; 2007, S 1; 21-29
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Material Flow Analysis of Waste Electrical and Electronic Equipment in Ukraine
    Autorzy:
    Hlavatska, Lilia
    Ishchenko, Vitalii
    Pohrebennyk, Volodymyr
    Salamon, Ivan
    Powiązania:
    https://bibliotekanauki.pl/articles/1955567.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    resource potential
    electronic device
    waste electrical and electronic equipment
    material flow analysis
    metals
    Opis:
    The composition of widespread electronic devices (mobile phone, computer mouse, keyboard, web-camera, monitor) was studied by manual dismantling. The material flow analysis was conducted for e-waste components. For the case study of Ukraine, five devices under investigation contain over 4 thousand tons / year resources. Most of them (first of all, plastic and metal) can be easily recovered. The content of chemical elements in the components of the electronic devices was determined by X-ray fluorescence analysis. Taking into account the mass of electronic waste generated in Ukraine, the resource potential of metals was estimated. Most of metals are concentrated in mobile phones and monitors (about 2000 tons/year). Apart from common metals, silver, molybdenum, vanadium, rubidium, zirconium, antimony, yttrium, rhodium, bismuth, and gallium were also found.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 9; 198-207
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of transit and socio-economical potential of Eastern Ukraine on the example of Lugansk region
    Razvitie tranzitnogo i socialno-ehkonomicheskogo potenciala Vostochnojj Ukrainy na primere Luganskojj oblasti
    Autorzy:
    Slobodyanyuk, M.
    Lapaeva, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/793060.pdf
    Data publikacji:
    2012
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    traffic flow
    transportation
    transit
    socioeconomic potential
    interregional cooperation
    transit communication
    logistic infrastructure
    cargo traffic
    Ukraine
    Lugansk Region
    Opis:
    This article considers the questions of creating the Euro-region on the example of Lugansk region, Ukraine. International, inter-regional cooperation is an important component in the development of foreign economic relations of Ukraine. Reforming of social - economic relationships in Ukraine, structural rearrangement of all mechanisms of society vital functions creates the background for the acceleration of territorial development of every region, first of all at the expense of beneficial geographical position and technological accessibility of transport - logistic service.
    В данной статье рассматриваются вопросы создания Еврорегиона на примере Луганской области, Украины. Международное, межрегиональное сотрудничество является важной составляющей в развитии внешнеэкономических связей Украины. Реформирование социально – экономических отношений в Украине, структурная перестройка всех механизмов жизнедеятельности общества создает предпосылки для ускорения территориального развития каждого из регионов прежде всего за счет выгодности географического расположения и технологической доступности транспортно – логистических услуг.
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 3
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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