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    Wyświetlanie 1-10 z 10
    Tytuł:
    Numerical and experimental analysis of balloon angioplasty impact on flow hemodynamics improvement
    Autorzy:
    Tomaszewski, Michał
    Sybilski, Kamil
    Małachowski, Jerzy
    Wolański, Wojciech
    Buszman, Piotr P.
    Powiązania:
    https://bibliotekanauki.pl/articles/27324133.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    angioplasty
    stent
    artery
    hemodynamics
    cfd analysis
    PIV method
    angioplastyka
    tętnica
    hemodynamika
    analiza CFD
    metoda PIV
    Opis:
    Purpose: The paper focuses on the numerical and experimental evaluation of the fluid flow inside chosen fragments of blood vessels. In the first stage of the study, the experimental tests were conducted using a research test stand, designed to be used in this evaluation. The study evaluated the blood flow through a silicone vessel with an implanted coronary stent. Methods: The PIV method was used in order to visualize the flow vectors inside a silicone vessel. Deformed vessel geometry implemented for computational fluid dynamics purposes was obtained owing to a non-linear simulation of the stent expansion (angioplasty process) in a silicone vessel. Additionally, a vessel model with a statistical 55% area stenosis and an irregular real vessel with an atherosclerotic plaque were also subjected to analysis from the hemodynamic flow point of view. A vessel with a statistical stenosis was also used to simulate the angioplasty process, which resulted in obtaining a flow domain for the vessel with an atherosclerotic plaque after the stent implantation. Results: For each case, distributions of parameters such as OSI or TAWSS were also analyzed and discussed. The areas of low TAWSS values appear close to the stent struts. Conclusions: Stents with increased diameters, compared to the normal vessel diameter, create a higher risk of occurrence of the areas with low WSS values. Excessive stent deformation can cause inflammation by injuring the vessel and can initiate the restenosis and thrombotic phenomena through the increased vessel diameter.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 3; 169--183
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CFD modeling of droplet generation process for medical applications using the electrostatic impulse method
    Autorzy:
    Cendrowski, Piotr
    Kramek-Romanowska, Katarzyna
    Lewińska, Dorota
    Grzeczkowicz, Marcin
    Korycka, Paulina
    Krzysztoforski, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/2202882.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    droplet generation
    electrostatic impulse method
    encapsulation
    CFD
    OpenFOAM
    generacja kropli
    metoda impulsu elektrostatycznego
    kapsułkowanie
    Kontrakty CFD
    Opis:
    The electrostatic impulse method is an established method for producing microbeads or capsules. Such particles have found application in biomedical engineering and biotechnology. The geometric properties of the droplets – constituting precursors of microbeads and capsules – can be precisely controlled by adjusting the geometry of the nozzle system, the physical properties and the flow rate of the fluids involved, as well as the parameters of the electrostatic impulse. In this work, a method of mathematical modeling of the droplet generation process using the electrostatic impulse method in a single nozzle system is presented. The developed mathematical model is an extension of the standard Volume of Fluid (VOF) model by addition of the effect of the electric field on the fluid flow. The model was implemented into the OpenFOAM toolkit for computational fluid dynamics (CFD). The performed CFD simulation results showed good agreement with experimental data. As a result, the influence of all process parameters on the droplet generation process was studied. The most significant change in droplet generation was caused by changing the electrostatic impulse strength. The presented modeling method can be used for optimization of process design and for studying the mechanisms of droplet generation. It can be extended to describe multi nozzle systems used for one-step microcapsule production.
    Źródło:
    Chemical and Process Engineering; 2022, 43, 3; 331--355
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Basic Equations of Fluid Mechanics in form Characteristic of the Finite Volume Method
    Podstawowe równania mechaniki płynów w formie charakterystycznej dla metody objętości skończonych
    Autorzy:
    Sobieski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/298275.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    CFD
    metoda objętości skończonych
    równania bilansowe
    finite volume method
    balance equations
    Opis:
    The article presents the derivation of the basic balance equations in form characteristic of the Finite Volume Method. In the following sections the origin of the balance equation of momentum, mass and energy is presented. Next, the conservation equations in vector form are described. The Finite Volume Method is used in Computational Fluid Mechanics for numerical modeling of fluid flows in wide range. The motivation for writing the article was the difficulty in finding short and concise articles on this subject in the literature. The current article is a first part of a cycle dedicated to the mathematical basis of the Finite Volume Method.
    W artykule przedstawiono wyprowadzenie podstawowych równań bilansowych w formie charakterystycznej dla metody objętości skończonych. Przedstawiono pochodzenie równania bilansu pędu, masy i energii, następnie równania zachowania w formie wektorowej. Metoda objętości skończonych jest stosowana w tzw. numerycznej mechanice płynów do numerycznego modelowania przepływów płynów w możliwie szerokim zakresie. Motywacją do napisania artykułu była trudność w znalezieniu podobnego rodzaju krótkich i zwięzłych opracowań na ten temat w literaturze. Artykuł jest pierwszą częścią cyklu poświęconego matematycznym podstawom metody objętości skończonych.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2011, 14(2); 299-313
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupled finite volume and finite element method analysis of a complex large-span roof structure
    Autorzy:
    Szafran, J.
    Juszczyk, K.
    Kamiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/264364.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    Finite Volume Method
    CFD simulation
    finite element method
    wind engineering
    metoda elementów skończonych
    inżynieria wiatrowa
    metoda objętości skończonych
    Opis:
    The main goal of this paper is to present coupled Computational Fluid Dynamics and structural analysis for the precise determination of wind impact on internal forces and deformations of structural elements of a longspan roof structure. The Finite Volume Method (FVM) serves for a solution of the fluid flow problem to model the air flow around the structure, whose results are applied in turn as the boundary tractions in the Finite Element Method problem structural solution for the linear elastostatics with small deformations. The first part is carried out with the use of ANSYS 15.0 computer system, whereas the FEM system Robot supports stress analysis in particular roof members. A comparison of the wind pressure distribution throughout the roof surface shows some differences with respect to that available in the engineering designing codes like Eurocode, which deserves separate further numerical studies. Coupling of these two separate numerical techniques appears to be promising in view of future computational models of stochastic nature in large scale structural systems due to the stochastic perturbation method.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 4; 995-1017
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Verification of heat flux and temperature calculation on the control rod outer surface
    Autorzy:
    Taler, J.
    Cebula, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/240728.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    strumień ciepła
    temperatura
    wymiana ciepła
    metoda inwersji
    CFD
    heat flux
    heat transfer
    inverse method
    temperature
    Opis:
    The paper presents heat transfer calculation results concerning a control rod of Forsmark Nuclear Power Plant (NPP). The part of the control rod, which is the object of interest, is surrounded by a mixing region of hot and cold flows and, as a consequence, is subjected to thermal fluctuations. The paper describes a numerical test which validates the method based on the solution of the inverse heat conduction problem (IHCP). The comparison of the results achieved by two methods, computational fluid dynamics (CFD) simulations and IHCP, including a description of the IHCP method used in the calculation process, shows a very good agreement between the methods.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 3; 157-173
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of blocks’ topologies on endothelial shear stress observed in CFD analysis of artery bifurcation
    Autorzy:
    Blagojevic, M.
    NIkolic, A.
    Živkovic, M.
    Stankovic, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/306720.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    artery bifurcation
    topology of blocks
    endothelial shear stress
    CFD
    FEM
    PAK
    układ krwionośny
    metoda elementów skończonych
    Opis:
    It is well known that endothelial shear stress affects occurrence of plaque in arteries. Lack of a method for measuring this physical quantity limits scientific understanding of this phenomenon. Application of numerical methods in this area has considerable amount of experimental verifications in terms of quantities that can be measured (velocity, pressure). On that basis we can rely on the results of endothelial shear stress calculations. The literature mainly documents the application of numerical methods to average geometries. However, arterial bifurcations are patient-specific. Moreover, occurrence of disease significantly complicates the geometry of the arteries and bifurcations. A multiblock concept provides the necessary geometrical flexibility and computational efficiency to generate patientspecific finite element models. For a particular class of problems different topologies of blocks are possible. This paper provides an overview of the possible block topologies required in finite element modeling using multiblock approach. In order to obtain accurate results of endothelial shear stress, two most general topologies are examined by numerical calculations. Favorable topology of the blocks is implemented in in-house software stl2fem.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 1; 97-104
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluid/solid coupled heat transfer analysis of a free rotating disc
    Autorzy:
    Bulat, P. V.
    Volkov, K. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/240377.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat transfer
    coupled analysis
    computational fluid dynamics
    finite element analysis
    disc
    rotating cavity
    transport ciepła
    sprzężona analiza
    CFD
    metoda elementów skończonych
    tarcza
    Opis:
    The coupled fluid/solid heat transfer computations are performed to predict the temperatures reached in the rotating disc systems. An efficient finite element analysis (FEA) and computational fluid dynamics (CFD) thermal coupling technique is developed and demonstrated. The thermal coupling is achieved by an iterative procedure between FEA and CFD calculations. In the coupling procedure, FEA simulation is treated as unsteady for a given transient cycle. To speed up the thermal coupling, steady CFD calculations are employed, considering that fluid flow time scales are much shorter than those for the solid heat conduction and therefore the influence of unsteadiness in fluid regions is negligible. To facilitate the thermal coupling, the procedure is designed to allow a set of CFD models to be defined at key time points/intervals in the transient cycle and to be invoked during the coupling process at specified time points. The computational procedure is applied to predict heat transfer characteristics of a free rotating disc.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 3; 169-192
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Three-dimensional modelling of thermal stresses in a planar solid oxide fuel cell of a novel design
    Modelowanie 3D termicznych naprężeń w płaskim stałotlenkowym ogniwie paliwowym o nowatorskiej konstrukcji
    Autorzy:
    Zinko, T.
    Pianko-Oprych, P.
    Jaworski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/408754.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    planar Solid Oxide Fuel Cell
    thermal stresses
    residual stresses
    finite element method
    computational fluid dynamics (CFD)
    płaskie stałotlenkowe ogniwo paliwowe
    naprężenie termiczne
    naprężenie szczątkowe
    Metoda Elementu Skończonego
    Numeryczna Mechanika Płynów
    Opis:
    The presented modelling investigation was carried out to analyze thermal stresses and expansion in an anode supported planar Solid Oxide Fuel Cell (pSOFC). The temperature distribution was based on previously developed thermo-electrochemical model predicting fuel cell operation. The design of a single pSOFC consisted of three ceramic layers of membrane electrode assembly: anode, electrolyte, cathode and two cross-flow bipolar plates with 26 ribs. The gases flowed diagonally from one cell corner to the opposite one. The fuel and air flows were cross-wise opposed on each bipolar plate side. The study allowed to indicate the most vulnerable to thermal damage area of the fuel cell in the operating conditions. The results will be useful in further design modification and performance optimization of the SOFC.
    Przeprowadzone symulacje numeryczne miały na celu analizę termicznych naprężeń i ocenę stopnia wydłużenia płaskiego stałotlenkowego ogniwa paliwowego typu pSOFC (ang. planar Solid Oxide Fuel Cell). Rozkład temperatury w ogniwie wyznaczono w oparciu o wcześniej opracowany model termiczno-elektrochemiczny [11]. Nowatorskie rozwiązanie ogniwa typu pSOFC objęło ceramiczną konstrukcję, w skład której weszły porowate elektrody – anoda i katoda, elektrolit oraz dwie płytki bipolarne z 26-cioma żebrami. Przepływ paliwa i powietrza odbywał się krzyżowo i przeciwprądowo, po przekątnej ogniwa. Wyniki symulacji pozwoliły na określenie obszarów ogniwa narażonych na uszkodzenie w wyniku wysokich wartości naprężeń termicznych. Uzyskane rezultaty FEM umożliwią dalszą modyfikację konstrukcji płaskiego ogniwa w celu optymalizacji wydajności pSOFC.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2016, 1; 69-72
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and numerical analyses of airflow around two cylinders angled to the direction of wind
    Autorzy:
    Padewska-Jurczak, Agnieszka
    Szczepaniak, Piotr
    Walentyński, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/2204499.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wind action
    CFD
    computational fluid dynamics
    FVM
    finite volume method
    ANSYS Fluent
    wind tunnel test
    water slide
    działanie wiatru
    obliczeniowa dynamika płynów
    metoda objętości skończonych
    testy w tunelu aerodynamicznym
    zjeżdżalnia wodna
    Opis:
    The analyses aim to determine aerodynamic force coefficients in the case of airflow around two smooth or rough cylinders positioned at different angles to the direction of wind velocity. Such systems, for instance, may be part of a tubular water slide. The results were compared with the values of the interference coefficient of the cylinders arranged in a row included in Eurocode EN 1991 part 4. The aerodynamic forces of the cylinder systems were determined on the basis of experimental tests conducted in a wind tunnel. To verify the above results, CFD (computational fluid dynamics) simulations were prepared. An important observation is that for the angle of yaw β = 0◦, the negative component of the lift force (lateral) fy is shown, while for the other cases, the situation is opposite and the lateral force points outside the gap (upward). The second is that the results of aerodynamic drag for rough cylinders arranged in a row and calculated according to EN 1991 part 4 may be underestimated. The flow around the pair of smooth cylinders is quite different from that of the rough ones, because during the experiment the first falls into the critical flow regime, while the second has supercritical characteristics.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 1; art. no. e144578
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A review of the numerical studies on planar and tubular solid oxide fuel cells within four EU projects of the 7th framework programme
    Autorzy:
    Pianko-Oprych, P.
    Jaworski, Z.
    Zinko, T.
    Palus, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185086.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Solid Oxide Fuel Cell
    stack
    fuel cell system
    Computational Fluid Dynamics
    CFD
    Finite Element Method
    FEM
    modelling
    process simulation
    ogniwo paliwowe z tlenkiem stałym
    system ogniw paliwowych
    obliczeniowa dynamika płynów
    metoda elementów skończonych
    MES
    modelowanie symulacje procesu
    Opis:
    The paper addresses the issues of quantification and understanding of Solid Oxide Fuel Cells (SOFC) based on numerical modelling carried out under four European, EU, research projects from the 7FP within the Fuel Cell and Hydrogen Joint Undertaking, FCH JU, activities. It is a short review of the main projects’ achievements. The goal was to develop numerical analyses at a single cell and stack level. This information was integrated into a system model that was capable of predicting fuel cell phenomena and their effect on the system behaviour. Numerical results were analysed and favourably compared to experimental results obtained from the project partners. At the single SOFC level, a static model of the SOFC cell was developed to calculate output voltage and current density as functions of fuel utilisation, operational pressure and temperature. At the stack level, by improving fuel cell configuration inside the stack and optimising the operation conditions, thermal stresses were decreased and the lifetime of fuel cell systems increased. At the system level, different layouts have been evaluated at the steady-state and by dynamic simulations. Results showed that increasing the operation temperature and pressure improves the overall performance, while changes of the inlet gas compositions improve fuel cell performance.
    Źródło:
    Chemical and Process Engineering; 2018, 39, 4; 377--393
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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