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    Wyświetlanie 1-7 z 7
    Tytuł:
    LES of converging-diverging channel flow with separation
    Autorzy:
    Kuban, L.
    Elsner, W.
    Tyliszczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943209.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska
    Tematy:
    LES
    turbulent boundary layer
    separation
    channel flow
    pressure gradient
    Opis:
    The paper presents the results of LES simulation of two different turbulent channels with inlet conditions corresponding to the Reynolds number Re =395. In both cases a varying pressure gradient was obtained by an adequate curvature of one of the walls. The first case is treated as a benchmark and is used to validate the numerical procedure. This case is characterized by the same cross-section area at the inlet and outlet and a bump of a smooth profile located on one of the walls designed to be identical to the one used in the experiment conducted at Laboratorie de Mecanique de Lille (LML) (Marquillie et al., 2008). The second case corresponds to the geometry which reproduces the real geometry of the turbomachinery test section of the Czestochowa University of Technology. The test section was created in such a way as to produce the pressure gradient which would correspond to the conditions present in the axial compressor blade channel. The shape of both channels produced initially favorable (FPG) and then adverse pressure gradients (APG), and in this way created conditions for boundary layer separation. Due to a reverse flow where the turbulence transport is dictated by the dynamics of the large-scale eddies such a case is well suited to demonstrate predictive features of the LES technique.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2010, 14, 3; 283-295
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    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:
    Efficient implementation of a compact-pseudospectral method for turbulence modeling
    Autorzy:
    Tyliszczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955215.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska
    Tematy:
    large eddy simulation
    compact scheme
    channel flow
    Opis:
    The paper is devoted to parallel implementation of a compact discretization scheme com-bined with the Fourier pseudospectral method. The idle time of processors resulting from the method of computating derivatives using compact schemes is eliminated by proper ordering of subtasks and by performing useful computations when processors are waiting for data from their neighbors. The correctnes of the algorithm is confirmed by comparison of results of LES simulations with DNS data for flow in a 3D channel with periodic non-slip wall boundary conditions.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 2; 125-138
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Second law analysis of mhd forced convective nanoliquid flow through a two-dimensional channel
    Autorzy:
    Miri, Rached
    Abbassi, Mohamed A.
    Ferhi, Mokhtar
    Djebali, Ridha
    Powiązania:
    https://bibliotekanauki.pl/articles/2204682.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    MHD
    LBM
    channel flow
    nanoliquids
    entropy generation
    Brownian motion
    Opis:
    The present study deals with fluid flow, heat transfer and entropy generation in a two-dimensional channel filled with Cu–water nanoliquid and containing a hot block. The nanoliquid flow is driven along the channel by a constant velocity and a cold temperature at the inlet, and the partially heated horizontal walls. The aim of this work is to study the influence of the most important parameters such as nanoparticle volume fraction (0%≤ϕ≤4%), nanoparticle diameter (5 nm≤dp≤55 nm), Reynolds number (50≤Re≤200), Hartmann number (0≤Ha≤90), magnetic field inclination angle (0≤γ≤π) and Brownian motion on the hydrodynamic and thermal characteristics and entropy generation. We used the lattice Boltzmann method (LBM: SRT-BGK model) to solve the continuity, momentum and energy equations. The obtained results show that the maximum value of the average Nusselt number is found for case (3) when the hot block is placed between the two hot walls. The minimum value is calculated for case (2) when the hot block is placed between the two insulated walls. The increase in Reynolds and Hartmann numbers enhances the heat transfer and the total entropy generation. In addition, the nanoparticle diameter increase reduces the heat transfer and the irreversibility, the impact of the magnetic field inclination angle on the heat transfer and the total entropy generation is investigated, and the Brownian motion enhances the heat transfer and the total entropy generation.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 4; 417--431
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Static instability of an inverted plate in channel flow: state-space representation and solution approximation
    Autorzy:
    Li, P.
    Zhang, D.
    Cui, J.
    Yin, H.
    Yang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/38697113.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    inverted cantilevered plate
    static aeroelastic instability
    channel flow
    state-space representation
    Glauert’s series
    the least squares method
    Opis:
    Plate-like structures in channel flow are commonly found in engineering. This paper reports a theoretical study on the static aeroelastic instability of an inverted cantilevered plate in an inviscid channel flow through the state space. This study begins with the kernel function of the flow potential determined in the Fourier domain with the help of the mirror image method. Then, the instability equation is derived from the operator theory and transformed in the state space. Finally, with Glauert’s expansion, model functions, and error functions, the instability problem of such a plate has been modeled as a mathematical function approximation problem and solved by the least squares method. The derived instability equation is considered at the continuum level of description, and no approximation appears at the first equation level. The convergence and reliability of the proposed modeling and its solutions approximation are entirely tested, and it can successfully predict the instability boundary, behavior, and the channel effect. Numerical results show that the decreased channel height and asymmetric plate placement in the channel significantly decrease the critical flow velocity. The plate instability modes are close to the plate’s first natural ones and not sensitive to the channel parameters. This conclusion allows further theoretical exploration of a semi-analytical approximation of the instability boundary from the obtained instability equation. The current modeling strategy in a continuum sense may provide a new idea and essential reference for other instability problems.
    Źródło:
    Archives of Mechanics; 2023, 75, 6; 695-727
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation of the micropolar fluid flow and heat transfer in a channel with a shrinking and a stationary wall
    Autorzy:
    Ali, K.
    Ashraf, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/949324.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    channel flow
    shrinking/stationary walls
    couple stress
    quasi-linearization
    Joule heating
    viscous dissipation
    Opis:
    We present the numerical study of hydromagnetic (MHD) flow and heat transfer characte- ristics of a viscous incompressible electrically conducting micropolar fluid in a channel with one wall shrinking and the other at rest in the presence of a transverse applied magnetic field. Different from the classical shooting methodology, we employ a combination of a di- rect and an iterative method (SOR with optimal relaxation parameter) for solving the sparse systems of linear algebraic equations arising from the FD discretization of the linearized self similar nonlinear ODEs. Effects of some physical parameters on the flow and heat transfer are discussed and presented through tables and graphs. The present investigation may be beneficial to the flow and thermal control of polymeric processing.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2014, 52, 2; 557-569
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of transversely-oriented wall corrugation on hydraulic resistance of a channel flow
    Wpływ poprzecznego pofalowania ścian na opory hydrauliczne przepływu w kanale
    Autorzy:
    Szumbarski, J.
    Blonski, S.
    Kowalewski, T. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/139979.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    przepływ w kanale
    opory hydrauliczne
    ściany pofalowane
    metody numeryczne
    channel flow
    hydraulic resistance
    corrugated walls
    numerical methods
    Opis:
    The impact of the transversely-oriented sinusoidal wall corrugation on the hydraulic drag is investigated numerically for the flow through the channel of finite width and with flat sidewalls. The numerical method, based on the domain transformation and Chebyshev-Galerkin discretization, is used to investigate the flow resistance of the laminar, parallel and pressure-driven flow. The obtained results are compared to the reference case, i.e., to the flow through the channel with rectangular cross section of the same aspect ratio. Simple explanation of the gain in the volumetric flow rate observed in the flow through spanwise-periodic channel with long-wave transversely-oriented wall corrugation is provided. In the further analysis, pressure drop in the flows with larger Reynolds numbers are studied numerically by means of the finite-volume commercial package Fluent. Preliminary experimental results confirm the predicted tendency.
    Przedmiotem artykułu jest analiza numeryczna wpływu poprzecznego sinusoidalnego pofalowania ścian na opory hydrauliczne przepływu cieczy lepkiej w kanale. Do wyznaczenia stacjonarnego pola ruchu cieczy lepkiej w kanale posłużono się transformacją obszaru i spektralną metodą Czebyszewa-Galerkina. Obliczone wartości strat ciśnienia porównano z przepływem laminarnym w kanale o ścianach płaskich i przekroju prostokątnym, przy zachowaniu takiej samej wartości stosunku szerokości kanału do jego wysokości. Podano objaśnienie efektu zmiejszenia oporów hydraulicznych w przypadku poprzecznego pofalowania o dużej długości fali. Omówiono również wyniki analizy wpływu pofalowania ścian na straty ciśnienia dla przepływów z większymi liczbami Reynoldsa, uzyskane przy pomocy komercyjnego programu Fluent. Przedstawiono wstępne wyniki badań eksperymentalnych, które potwierdzają zależności otrzymane w modelach numerycznych.
    Źródło:
    Archive of Mechanical Engineering; 2011, LVIII, 4; 441-466
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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