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    Wyświetlanie 1-9 z 9
    Tytuł:
    Rotating Rayleigh-Benard convection
    Autorzy:
    Majchrowski, W.
    Tuliszka-Sznitko, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943236.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Gdańska
    Tematy:
    DNS
    Rayleigh-Benard convection
    Opis:
    In the this paper our results on the natural convection in an enclosed rotating cavity are presented. We have focused our attention on the influence of the Rayleigh and Taylor numbers on the flow structure. DNS computations have been performed for the geometry of aspect ratio L=9 and curvature parameter Rm=1.5.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2008, 12, 3-4; 267-272
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Open-Source CFD analysis of multi-domain unsteady heating with natural convection
    Autorzy:
    Sosnowski, P.
    Pozorski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943189.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska
    Tematy:
    CFD
    open source software
    unsteady heating
    natural convection
    multi-domain heat transfer
    Opis:
    The paper presents the capabilities of open-source programs used for numerical simulation of fluid flow and heat transfer phenomena. These tools are applied for unsteady problems with natural convection and, in particular, the heating of an automotive headlight. To perform these studies, a solver was created using an open-source C++ library OpenFOAM. The implementation problems encountered were, inter alia, dealing with multi-domain computation and coupling of sub-domains. The presented simulation results clearly show that open-source software can readily be applied also to engineering problems and can compete with commercial packages.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2009, 13, 4; 403-414
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New model of convection based on particle approach
    Autorzy:
    Alda, Witold
    Dzwinel, Witold
    Kitowski, Jacek
    Mościński, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1953480.pdf
    Data publikacji:
    1997
    Wydawca:
    Politechnika Gdańska
    Opis:
    A new model for thermal convection simulations using molecular dynamics (MD) approach is reported briefly. Preliminary results are presented. Development of the method is discussed in short.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1997, 1, 1; 82-88
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel analytic-numerical model of free convection: with leading edge considered
    Autorzy:
    Leble, S.
    Lewandowski, W. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954434.pdf
    Data publikacji:
    2022-02-01
    Wydawca:
    Politechnika Gdańska
    Tematy:
    Navier-Stokes equations
    Fourier-Kirchhoff equations
    free convection
    heat transfer
    isothermal surface
    boundary layer
    vertical plate
    leading edge
    Równania Naviera-Stokesa
    równanie Fouriera-Kirchhoffa
    przenikanie ciepła
    izoterma powierzchni
    warstwa graniczna
    płyty pionowe
    Opis:
    A novel solution of the free convection boundary problem is represent ed in analytical form for velocity and temperature for an isothermal vertical plate, as an example. These fields are built as a Taylor Series in the x coordinate with coefficients as functions of the vertical coordinate (y). We restrict ourselves by cubic approximation for both functions. The basic Navier-Stokes and Fourier-Kirchhoff equations and boundary conditions give links between coefficients and connected with free convection heat transfer phenomen on which define the analytical form of the solution as a function of the Grashof number only. In t he solution the non zero velocity of a fluid flow through a leading edge of the plate is take n into account. The solution in the form of velocity and temperature profiles is numerically evaluated and illustrated for air.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2014, 18, 2; 167--185
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical modelling and analysis of cooling system of electrical transformer dipped into polymerised resin
    Autorzy:
    Smołka, J.
    Nowak, A. J.
    Wrobel, L. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955729.pdf
    Data publikacji:
    2003
    Wydawca:
    Politechnika Gdańska
    Tematy:
    dry electrical transformer
    heat transfer
    natural convection
    coupled analysis
    Opis:
    This paper discusses a numerical model of the heat dissipation processes in an electrical transformer dipped into polymerised resin. The transformer is cooled by both natural convection (via the ambient air) and forced convection (via the water cooling system attached to one of the transformer casing walls). Two cases have been compared, i.e. the cooler connected to the bottom or the top wall of the transformer container, respectively. In order to improve the modelling of the natural convection problem, an independent geometrical model of the surrounding air was created and considered separately. The continuity of temperature and heat flux along the interface between the transformer and air was enforced by an iterative procedure. This procedure allowed one to calculate and then prescribe local heat fluxes to the external walls of the transformer. The numerical results obtained in this project have yielded information on the efficiency of the analysed cooling system.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 3; 439-448
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytic-numerical model of a convective boundary layer and heat transfer on a horizontal cone
    Autorzy:
    Leble, S.
    Pelc, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943220.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska
    Tematy:
    natural convection
    Fourier-Kirchhoff equations
    boundary layer equation
    isothermal cone
    matching of Frobenius expansions
    Opis:
    An approximate analytical solution of a two dimensional problem for stationary Navier-Stokes, continuity and Fourier-Kirchhoff equations describing a free convective heat transfer from an isothermal cone is presented. The problem formulation is based on assumptions typical for natural convection: non-compressibility and the Boussinesq approximation. The solution is based on Frobenius expansions at the vicinities of two points: the initial point and the singular point of the boundary layer equation. Numerical matching of the expansions and Nusselt number evaluations are traced.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2009, 13, 1-2; 133-144
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulations of the effect of time-dependent random mass density field on frequencies of sound waves
    Autorzy:
    Murawski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955804.pdf
    Data publikacji:
    2001
    Wydawca:
    Politechnika Gdańska
    Tematy:
    numerical simulations
    convection - Sun
    oscillations - turbulence
    time-dependent random mass density field
    space-dependent random field
    Opis:
    Numerical simulations of the effect of random mass density field on frequencies of sound waves are considered for driven and impulsive sound waves which are described by one-dimensional hydrodynamic equations, with the ponderomotive force which depends stochastically both on space and time. The numerical results reveal frequency increase for short waves and both wave damping and amplification for the overall range of wavenumbers. Moreover, a space- and time-dependent random field leads to a generation of a wide frequency spectrum which contains both retarded and speeded up waves.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 2; 229-238
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On free convection heat transfer from vertical plate - proposition of a new model
    Autorzy:
    Leble, S.
    Lewandowski, W. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1938587.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska
    Tematy:
    Navier-Stokes equations
    Fourier-Kirchhoff equation
    free convective heat transfer
    analytical solution
    sothermal surface
    boundary layer
    vertical plate
    Opis:
    The free convection heat transfer from an isothermal vertical plate in open space is investigated theoretically. In contrast to conventional approaches we use neither boundary layer nor self-similarity concepts. We base on expansion of the fields of velocity and temperature in a Taylor Series in x coordinate with coefficients being functions of the vertical coordinate (y). In the minimal version of the theory we restrict ourselves by cubic approximation for both functions. The Navier-Stokes and Fourier-Kirchhoff equations that describe the phenomenon give links between coefficient functions of y that after exclusion leads to the ordinary differential equation of forth order (of the Mittag-Leffleur type). Such construction implies four boundary conditions for a solution of this equation while the links between the coefficients need two extra conditions. All the conditions are chosen on the basis of the experience usual for free convection. The choice allows us to express all the theory parameters as functions of the Rayleigh number and the temperature difference. To support the conformity of the theory we derive the Nusselt-Rayleigh numbers relation that has the traditional form. The solution in the form of velocity and temperature profiles is evaluated and illustrated for air by examples of plots of data.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 2; 249-265
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An algorithm of velocity field evaluation via temperature field measurement on the basic of streamline-defined coordinates
    Autorzy:
    Leble, S.
    Shaban, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1940181.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska
    Tematy:
    free convective heat transfer
    isothermal surface
    numerical analysis
    natural convection
    streamline coordinate system
    ciepło konwekcyjne
    przepływ ciepła
    powierzchnia izotermiczna
    analiza numeryczna
    konwekcja naturalna
    transformacja współrzędnych
    Opis:
    A new algorithm is presented for evaluating the velocity field of the heat convection flow from a vertical solid flat plate using the temperature field. Using the coordinate transformation of Cartesian coordinates, to coordinates defined via streamlines, and visible in such coordinate approximations, it is possible to express the basic flow fields in terms of the temperature gradients only. After discretization we formulate approximated sufficient finite-difference formulas to evaluate the velocity field using the experimental data.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2017, 21, 3; 247-259
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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