Wyniki wyszukiwania dla: CFD, BLOOD FLOW

• CFD analysis of fluid flow through the labyrinth seal

  Publikacja

  • P. B. Kaszowski
  • M. Dzida

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2015

  Steam and gas turbines are some of the fundamental means of power generation. The energy efficiency of the turbines, however, is not satisfactory. Ever since the start-up of the first turbine in the world, engineers have been striving for their increased efficiency. Multiple solutions to the problem of steam loss in an operating turbine are available. The use of seals is one of them. Empirical methods or numerical calculations...

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• CFD Simulations and Tests of a Prototype Flow Control Valve

  Publikacja

  • M. Zaleska-Patrosz
  • P. Patrosz
  • P. Śliwiński

  - Rok 2021

  In this paper a prototype of a flow control valve is described and numerically simulated. The flow control valve is used in hydraulic systems to maintain constant fluid flow despite changing loads of a receiver. The standard construction of this type of valves is modified mainly by eliminating the spring. The prototype consists the hydrostatically unloaded throttle valve and pressure ratio valve substituting pressure difference...

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• Estimation of the steam condensation flow via CFD methods

  Publikacja

  • W. Zakrzewski
  • M. Karcz
  • S. Kornet

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2012

  The results of numerical simulations to predict the performance of different steam models have been presented. All of the considered models of steam condensation have been validated on the base of benchmark experiment employing expansion in nozzle and next on the low pressure part of the steam turbine stage. For numerical analysis three models have been finally used – the ideal steam model without condensation, an equilibrium steam...

• Modelling of blood flow: from macro to microscales

  Publikacja

  • K. Kaczorowska-Ditrich
  • K. Tesch

  - Rok 2016

  The aim of this paper it to review various scale approaches to blood flow modelling. Blood motion may be described by three types of mathematical models according to the observed scales or resolutions, namely microscopic, mesoscopic and macroscopic description. The above approaches are discussed together with their advantages and disadvantages. Several results of mesoscopic simulations are presented.

• Numerical solutions for blood flow in elastic vessels

  Publikacja

  • H. Leszczyński
  • A. Poliński
  • M. Wrzosek

  - MATHEMATICAL METHODS IN THE APPLIED SCIENCES - Rok 2020

  We consider the differential–algebraic system for the blood flow and pressure in the systemic arteries. By the operator splitting method, we transform the system into the hyperbolic one, introduce the bicharacteristics, and perform the time–space nonuniform discretization, obtaining the innovative difference scheme. Our results are illustrated with numerical experiments.

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• Modeling of capillary fluid flow in concrete using a DEM-CFD approach

  Publikacja

  • M. Krzaczek
  • M. Nitka
  • J. Tejchman

  - Rok 2022

  Sformułowano połączone podejście do modelowania dwufazowego przepływu wody napędzanego hydraulicznie i kapilarnie w nienasyconym betonie. Proces przepływu analizowano numerycznie w mezoskali w warunkach dwuwymiarowych (2D), łącząc metodę elementów dyskretnych (DEM) z obliczeniową dynamiką płynów (CFD) w warunkach izotermicznych. Przeprowadzono w pełni sprzężone hydromechaniczne testy symulacyjne na małych próbkach betonu o uproszczonej...

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• Discrete-continuous optimisation of an axial flow blood pump

  Publikacja

  • K. Tesch
  • K. Kaczorowska-Ditrich

  - Journal of Physics : Conference Series - Rok 2018

  This paper presents results of discrete-continuous optimisation of an axial flow blood pump. Evolution Strategies (ES) are used as a global optimisation method in order to localise the optimal solution in relatively short time. The whole optimisation process is fully automated. This also applies to geometry modelling. Numerical simulations of the flow inside the pump is performed by means of the Reynolds-Average Navier-Stokes...

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• GENERALISED HERSCHEL MODEL APPLIED TO BLOOD FLOW MODELLING

  Publikacja

  • K. Tesch

  - TASK Quarterly - Rok 2012

  This paper introduces a new rheological model of blood as a certain generalisation of the standard Herschel-Bulkley model. This model is a rheological constitutive equation and belongs to the group of the so-called generalised Newtonian fluids. Experimental data is compared with results, obtained from the new model, to demonstrate that it allows for the best agreement together with Luo-Kuang model. The new model may be easily implemented...

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• Doppler blood flow recordings

  Dane Badawcze

  open access

  • T. Kocejko

  Vital signals registration plays a grate role in biomedical engineering and education process. Well acquired data allow future engineers to observe certain physical phenomenons as well learn how to correctly process and interpret the data. This data set was designed for students to learn about Doppler phenomena and to demonstrate correctly and incorrectly...

• Educational Dataset of Handheld Doppler Blood Flow Recordings

  Publikacja

  • T. Kocejko

  - Rok 2022

  Vital signals registration plays a significant role in biomedical engineering and education process. Well acquired data allow future engineers to observe certain physical phenomena as well learn how to correctly process and interpret the data. This dataset was designed for students to learn about Doppler phenomena and to demonstrate correctly and incorrectly acquired signals as well as the basic methods of signal processing. This...

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