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    Wyświetlanie 1-3 z 3
    Tytuł:
    A two-stage model of an arteriovenous fistula maturation process
    Autorzy:
    Jodko, Daniel M.
    Obidowski, Damian S.
    Reorowicz, Piotr
    Jóźwik, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/27324149.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hemodialysis
    anastomosis
    fluid structure interaction
    wall shear stress
    arteriovenous fistula AVF
    AVF maturation
    hemodializa
    zespolenie
    interakcja struktury płynu
    naprężenie ścinające ściany
    przetoka tętniczo-żylna AVF
    dojrzewanie AVF
    Opis:
    Purpose: An arteriovenous fistula has been a widely accepted vascular access for hemodialysis, however, a fistula maturation process is still not fully understood. In the short period of time, right after vein and artery shunting, the physical and biological changes take place mainly in the venous wall. A two-stage modeling method of arteriovenous fistula maturation process was proposed and presented. Methods: The first stage of the maturation was modeled with two-way coupled fluid structure interaction computer simulations. Whereas for the second, biological stage, a model was based on the change in the elasticity of the venous wall due to wall shear stress (WSS) modifications. Results: The relation between stress and radial and circumferential strain, based on Lame’s theory, makes possible to introduce a mathematical model defining modulus of elasticity, averaged WSS, and venous diameter as time functions. The presented model enables one to predict changes in the monitored parameters in the arteriovenous fistula taking place in the time longer than 90 days. Conclusions: We found that probably the majority of fistulas can be assessed to be mature too early, when the adequate blood flow rate is achieved but mean WSS still remains at the non-physiological level (>10 Pa).
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 2; 139--153
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of overset mesh approach in the investigation of the Savonius wind turbines with rigid and deformable blades
    Autorzy:
    Marchewka, Emil
    Sobczak, Krzysztof
    Reorowicz, Piotr
    Obidowski, Damian Stanisław
    Jóźwik, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/1955051.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CFD
    savonius
    deformable blade
    overset mesh
    sliding mesh
    Opis:
    Machines utilising renewable energy constantly undergo research aimed at raising their efficiency. One of them is a Savonius wind turbine, where scientists propose adjustments to improve its aerodynamic properties. At present, their assessment is usually performed by means of transient computational fluid dynamics simulations with two- or threedimensional models. In this paper, the overset (chimera) mesh approach was applied to investigate the performance of a Savonius wind turbine equipped with deformable blades. They were continuously deformed during rotation by a dedicated mechanism to increase a positive torque of the advancing blade, and meanwhile, decrease a negative torque of the returning blade. A quasi-two-dimensional model with a two-way fluid-structure interaction method was applied, where the structural solver determined blade deflection caused by the predefined deformation mechanism and aerodynamic loads, whereas the coupled computational fluid dynamics solver determined the transient flow. The deformable blades rotor performance was calculated and compared with a conventional rigid Savonius turbine, both simulated using the overset mesh approach. The average value of the power coefficient achieved a 55% rise in the case of deformable blades turbine. Additionally, to validate the overset method, its results were compared with the classical sliding mesh method for a conventional rigid rotor.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 4; 201-216
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inhaled drug airflow patterns and particles deposition in the paediatric respiratory tract
    Autorzy:
    Tyfa, Zbigniew
    Jóźwik, Paulina
    Obidowski, Damian
    Reorowicz, Piotr
    Jodko, Daniel
    Kapka, Krystyna
    Makosiej, Ryszard
    Czkwianianc, Elżbieta
    Powiązania:
    https://bibliotekanauki.pl/articles/27324137.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    patient-specific model
    particle tracking
    inhaled drug
    airflow CFD simulation
    paediatric respiratory tract
    śledzenie cząstek
    lek wziewny
    symulacja CFD przepływu powietrza
    respirator dziecięcy
    Opis:
    : The effectiveness of inhaled drugs is strictly related to areas reachable by drug particles. Unless particles reach the desired part of the bronchial tree, their influence might not meet the expectations. Consequently, the disease progress might not be stopped or even slowed down. Therefore, the primary objective of this research was to analyze the airflow patterns and particle deposition of a standard inhaled drug using computational fluid dynamics. Methods: The study was devoted to the analysis of the particle diameter influence on their deposition areas within the entire respiratory tract. Two patient-specific respiratory tract models, for 6 and 12-year-old patients, were reconstructed based on the computed tomography examinations. Numerical analyses were carried out as stationary ones with the constant inflow of the particles of various diameters (within the range of 1–50 μm). It was proven that depending on the particle size, their deposition within the respiratory tract varies significantly. Results: The vast majority of the particles with diameters over 20 μm is gathered on the walls of the throat, whereas particles of diameters 5–15 μm are accumulated mainly on the trachea walls, leaving the alveoli insufficiently supplied with the drug particles. Conclusions: The inhaled drug size cannot be treated as negligible factor during the drug spraying. An improper distribution of the particles might not inhibit the symptoms of the asthma. Numerical simulations may improve drugs selection and visualize their distribution along the airways, which might accelerate asthma treatment personalization.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 2; 101--110
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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