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    Wyświetlanie 1-13 z 13
    Tytuł:
    Magnetohydrodynamic flow of viscous fluid in a slot between fixed surfaces of revolution
    Autorzy:
    Sawicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/260433.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    laminar flow
    incompressible magnetohydrodynamic flow
    method of perturbation
    Opis:
    The paper considers stationary magnetohydrodynamic flow of viscous fluid in the slot between fixed curvilinear surfaces of revolution exposed to azimuthal magnetic field. To solve the problem, the equations of boundary layer in the curvilinear coordinate system. x,θ,y , were applied. The equations of the boundary layer were solved analytically with the use of the small-parameter method. The formulas determine the field of velocity and pressure.
    Źródło:
    Polish Maritime Research; 2017, 3; 78-85
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Incompressible SPH Model for Simulating Violent Free-Surface Fluid Flows
    Autorzy:
    Staroszczyk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/241132.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    gravity water wave
    free surface
    incompressible flow
    Lagrangian description
    smoothed particle hydrodynamics
    Opis:
    In this paper the problem of transient gravitational wave propagation in a viscous incompressible fluid is considered, with a focus on flows with fast-moving free surfaces. The governing equations of the problem are solved by the smoothed particle hydrodynamics method (SPH). In order to impose the incompressibility constraint on the fluid motion, the so-called projection method is applied in which the discrete SPH equations are integrated in time by using a fractional-step technique. Numerical performance of the proposed model has been assessed by comparing its results with experimental data and with results obtained by a standard (weakly compressible) version of the SPH approach. For this purpose, a plane dam-break flow problem is simulated, in order to investigate the formation and propagation of a wave generated by a sudden collapse of a water column initially contained in a rectangular tank, as well as the impact of such a wave on a rigid vertical wall. The results of simulations show the evolution of the free surface of water, the variation of velocity and pressure fields in the fluid, and the time history of pressures exerted by an impacting wave on a wall.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2014, 61, 1-2; 61-83
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multiblock parallel computation of an incompressible 3D flow in turbomachines
    Autorzy:
    Papierski, A.
    Rabiega, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954540.pdf
    Data publikacji:
    1999
    Wydawca:
    Politechnika Gdańska
    Tematy:
    numerical simulations
    turbomachinery
    incompressible flow
    3D Navier-Stockes solver
    Navier-Stokes solver
    parallel computing
    Opis:
    A finite volume numerical method for the prediction of a fluid flow in complex geometries such as turbomachinery channels has been parallelized using a domain decomposition approach. A mathematical formulation of a 3-D incompressible steady flow has been presented on the basis of the N-S equations in a grid-oriented co-ordinate system with contravariant velocity components. A parallelized pressure-based implicit algorithm with discretization on a staggered grid has been developed. A message exchange system with a boundary exchange, developed by the authors, has been described. Exemplary calculations have been carried out for a laminar flow through a curved duct and for an inviscid flow through a stage of the centrifugal pump. A good agreement has been obtained in both the cases. Despite considerable simplification that has been introduced in the flow through the pump stage, the computations have shown nearly the same pressure rise in the stage as the measurements. Further directions of numerical investigations of a flow through turbomachines, including in particular those devoted to pressure losses related to the rotor-stator interaction, have been mentioned.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 1; 39-52
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Homotopy simulation of non-Newtonian Spriggs fluid flow over a flat plate with oscillating motion
    Autorzy:
    Ray, A. K.
    Vasu, B.
    Gorla, R. S. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/265238.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    przepływ nieściśliwy
    przepływy Stokes'a
    płyn nienewtonowski
    incompressible flow
    oscillatory plate
    Stokes second problem
    HAM
    non-Newtonian Spriggs fluid
    Opis:
    An incompressible flow of a non-Newtonian Spriggs fluid over an unsteady oscillating plate is investigated using the Homotopy Analysis Method (HAM). An analytic solution of sine and cosine oscillations of the plate has been obtained. The similarity transformation is introduced to reduce the governing partial differentia equations into a single non-linear dimensionless partial differential equation. The effects of the power index of Spriggs fluid and convergence control parameter of HAM for the flow are studied extensively. The range of the convergence control parameter for convergence of series solution for different values of the power index of Spriggs fluid is obtained. The solution for a Spriggs fluid is noticeably different from the solution obtained for a Newtonian fluid. The influences of the shear thinning and shear thickening fluid on the velocity profile are shown graphically. The transient flow effect is higher for non-Newtonian Spriggs fluid than that of a Newtonian fluid. It is also observed that the interval to reach the steady state for the cosine case is less than the sine case. The applications of Stokes’ second problem have been widely found in the variety of fields of biomedical, medical, chemical, micro and nanotechnology.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 2; 359-385
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation of channel flow over a skewed equilateral cavity
    Autorzy:
    Kamel, Abanoub G.
    Haraz, Eman H.
    Hanna, Sarwat N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839759.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    finite difference method
    incompressible flow
    channel flow
    lid-driven
    shear-driven
    skewed cavity
    Navier-Stokes equations
    równanie Naviera-Stokesa
    przepływ nieściśliwy
    metoda różnic skończonych
    przepływ kanałowy
    Opis:
    In this paper, an incompressible, two-dimensional (2D), time-dependent, Newtonian, laminar, and internal channel fluid flow over a skewed equilateral cavity is simulated using the finite difference method (FDM) and alternating direction implicit (ADI) technique. Navier-Stokes equations are solved numerically in stream function-vorticity formulation. The goal of tackling this problem depends on its academic significance by studying the difference between lid-driven and shear-driven cavity flows in terms of the formation of Moffatt eddies at the sharp corner, also to obtain the length and intensity ratios of these counter-rotating vortices. The value of velocity components along the centerlines of the skewed cavity was revealed at low and intermediate Reynolds numbers (Re), typically (Re = 200 and 2000) at two different skew angles of mainly 30° and 45°. Likewise, the blocked-off regions’ method is used to deal with the geometry of the skewed cavity especially the sharp corners. Furthermore, as Re increases, the main vortex approaches the skewed cavity center and the counter-rotating vortices get bigger in size and intensity, and their number increases.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 3; 29-43
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pressure stabilized finite elements simulation for steady and unsteady Newtonian fluids
    Autorzy:
    Elhanafy, A.
    Guaily, A.
    Elsaid, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/122595.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    unsteady incompressible viscous flow
    pressure stabilization technique
    equal low-order finite elements
    Galerkin least squares
    przepływ lepki
    stabilizacja ciśnienia
    Opis:
    A numerical simulation of an incompressible viscous flow using the finite element method is presented. In this study, the pressure stabilization technique is suggested for the treatment of the incompressibility constraint for both steady and unsteady flow cases. To the best of the authors’ knowledge, the pressure stabilization technique is used for steady flows only. The proposed technique allows for equal low-order interpolation polynomials to be used for all variables which circumvent the so-called LBB compatibility condition without pressure checker boarding and solution instabilities. Results are obtained for two benchmark problems, namely, lid-driven cavity flow and the vortex-shedding behind a circular cylinder. The results are compared with published numerical and experimental works with an apparent degree of success.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2017, 16, 3; 17-26
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Towards to efficiency maximum within a pressure increasing process
    Autorzy:
    Puzyrewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/175336.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    efficiency
    kinematic flow
    pumps
    incompressible fluid
    Opis:
    The article presents a mathematical description of compression process in a pump and an original concept to increase efficiency in this process.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 153-168
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferromagnetic flow of viscous fluid in a slot between fixed surfaces of revolution
    Autorzy:
    Sawicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/260429.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    laminar flow
    incompressible ferromagnetic fluid
    method of perturbation
    Opis:
    In this paper the steady laminar flow of viscous incompressible ferromagnetic fluid is considered in a slot between fixed surfaces of revolution having a common axis of symmetry. The boundary layer ferromagnetic equations for axial symmetry are expressed in terms of the intrinsic curvilinear orthogonal coordinate system x, θ ,y.The method of perturbation is used to solve the boundary layer equations. As a result, the formulae defining such parameters of the flow as the velocity components vx, vy, and the pressure , were obtained.
    Źródło:
    Polish Maritime Research; 2016, 4; 99-104
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stokes flow of an incompressible micropolar fluid past a porous spheroidal shell
    Autorzy:
    Iyengar, T.
    Radhika, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/202342.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Stokes flow
    incompressible micropolar fluid
    porous spheroidal shell
    Opis:
    Consider a pair of confocal prolate spheroids S0 and S1 where S0 is within S1. Let the spheroid S0 be a solid and the annular region between S0 and S1 be porous. The present investigation deals with a flow of an incompressible micropolar fluid past S1 with a uniform stream at infinity along the common axis of symmetry of the spheroids. The flow outside the spheroid S1 is assumed to follow the linearized version of Eringen’s micropolar fluid flow equations and the flow within the porous region is assumed to be governed by the classical Darcy’s law. The fluid flow variables within the porous and free regions are determined in terms of Legendre functions, prolate spheroidal radial and angular wave functions and a formula for the drag on the spheroid is obtained. Numerical work is undertaken to study the variation of the drag with respect to the geometric parameter, material parameter and the permeability parameter of the porous region. An interesting feature of the investigation deals with the presentation of the streamline pattern.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 1; 63-74
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Analysis of the Problem of Flow Past a Cylindrical Body Applying the R-Functions Method and The Galerkin Method
    Autorzy:
    Lamtyugova, S.N.
    Sidorov, M. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/410652.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    viscous incompressible fluid
    flow problem
    R-functions method
    Galerkin method
    Opis:
    The article considers the stationary problem of viscous incompressible fluid flow past a cylindrical body. For solving the problem it is proposed a numerical method, based on the joint use of R-functions method and the Galerkin method. The computational experiment has been conducted for the task of flow past square cylinder for different Reynolds numbers.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2014, 3, 3; 43-50
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analysis of numerical simulations of blood flow through the segment of an artery in the presence of stenosis
    Autorzy:
    Shaikh, Fozia
    Shaikh, Asif Ali
    Hincal, Evren
    Qureshi, Sania
    Powiązania:
    https://bibliotekanauki.pl/articles/24201504.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    incompressible
    isothermal
    blood flow
    stenosis
    finite element method
    izotermiczność
    przepływ krwi
    zwężenie
    metoda elementów skończonych
    Opis:
    A mathematical model is developed to study the characteristics of blood flowing through an arterial segment in the presence of a single and a couple of stenoses. The governing equations accompanied by an appropriate choice of initial and boundary conditions are solved numerically by Taylor Galerkin’s time-stepping equation, and the numerical stability is checked. The pressure, velocity, and stream functions have been solved by Cholesky’s method. Furthermore, an in-depth study of the flow pattern reveals the separation of Reynolds number for the 30 and 50% blockage of single stenosis and 30% blockage of multi-stenosis. The present results predict the excess pressure drop across the stenosis site than it does for the inlet of the artery with single and multiple stenosis and the increase in the velocity is observed at the center of the artery.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2023, 22, 2; 49--61
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical Modeling and Numerical Analysis of Nonstationary Plane-Parallel Flows of Viscous Incompressible Fluid by R-Functions and Galerkin Method
    Autorzy:
    Artyukh, A.
    Sidorov, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/411247.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    nonstationary flow
    incompressible fluid
    stream function
    method of successive approximation
    R-functions method
    Galerkin method
    Opis:
    This paper is dedicated to nonstationary plane-parallel flows of viscous incompressible fluid in finite simply connected domains. Theorem of the solution uniqueness is presented. The method of successive approximation, the Galerkin method and the R-functions method are used to obtain the numerical solution, which was tested on the problem with known solution.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2014, 3, 3; 3-11
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lipschitz stability of optimal controls for the steady-state Navier-Stokes equations
    Autorzy:
    Roubicek, T.
    Troltzsch, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/970527.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    sterowanie strumieniem danych
    stabilność Lipschitza
    incompressible viscous fluids
    flow control
    first and second order optimality conditions
    Lipschitz stability
    Opis:
    An optimal control problem with quadratic cost functional for the steady-state Navier-Stokes equations with no-slip boundary condition is considered. Lipschitz stability of locally optimal controls with respect to certain perturbations of both the cost functional and the equation is proved provided a second-order sufficient optimality condition holds. For a sufficiently small Reynolds number, even global Lipschitz stability of the unique optimal control is shown.
    Źródło:
    Control and Cybernetics; 2003, 32, 3; 683-705
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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