Poslední příspěvky

  • Spatio-temporal description of the cavitating flow behavior around NACA 2412 hydrofoil 

    Rudolf, Pavel; Štefan, David; Sedlář, Milan; Kozák, Jiří; Habán, Vladimír; Huzlík, Rostislav (IOP Publishing, 2015-12-06)
    Spatio-temporal description of the cavitating flow around hydrofoil with 8 degrees incidence using proper orthogonal decomposition (POD) is presented. POD is a suitable tool, which provides information not only about the ...
  • New boundary conditions for fluid interaction with hydrophobic surface 

    Pochylý, František; Fialová, Simona; Havlásek, Michal (EDP Sciences, 2018-06-04)
    Solution of both laminar and turbulent flow with consideration of hydrophobic surface is based on the original Navier assumption that the shear stress on the hydrophobic surface is directly proportional to the slipping ...
  • Comparison of two inlet boundary approaches in numerical simulation of car ventilation outlet flow 

    Talanda, Tomáš; Niedoba, Pavel; Lízal, František; Jícha, Miroslav (EDP Sciences, 2015-11-17)
    The paper is concerned with the comparison of two inlet boundary approaches of numerical simulations. The first approach is based on the simulation of a sufficiently long duct upstream the area of interest with known ...
  • Bulk viscosity of water in acoustic modal analysis and experiment 

    Kůrečka, Jan; Habán, Vladimír; Himr, Daniel (EDP Sciences, 2018-06-04)
    Bulk viscosity is an important factor in the damping properties of fluid systems and exhibits frequency dependent behaviour. A comparison between modal analysis in ANSYS Acoustics, custom code and experimental data is ...
  • Dynamics of the nozzle valve with regard to the properties of the piping system 

    Klas, Roman; Habán, Vladimír; Rudolf, Pavel (EPJ Web of Conferences, 2018-06-04)
    It is obvious that the main function of the nozzle valve is to shut off the stream of fluid in the piping system. The response rate of the valve to the decreasing or reversing flow in the system will then depend on the ...
  • Study of the nozzle check valve with respect to its operating characteristics 

    Klas, Roman; Habán, Vladimír; Rudolf, Pavel (EPJ Web of Conferences, 2018-06-04)
    Several modifications were developed when designing the nozzle valve. This study offers an assessment of the properties of new modifications of the nozzle valve design. The main operating characteristics, such as loss and ...
  • Energy transformation and flow topology in an elbow draft tube 

    Štefan, David; Rudolf, Pavel; Skoták, Aleš; Motyčák, Lukáš (University of West Bohemia, 2012-06-01)
    Paper presents a computational study of energy transformation in two geometrical configurations of Kaplan turbine elbow draft tube. Pressure recovery, hydraulic efficiency and loss coefficient are evaluated for a series ...
  • Proper Orthogonal Decomposition of Pressure Fields in a Draft Tube Cone of the Francis (Tokke) Turbine Model 

    Štefan, David; Rudolf, Pavel (IOP Publishing, 2015-01-06)
    The simulations of high head Francis turbine model (Tokke) are performed for three operating conditions - Part Load, Best Efficiency Point (BEP) and Full Load using software Ansys Fluent R15 and alternatively OpenFOAM ...
  • Numerical and experimental investigation of swirling flow in a conical diffuser 

    Štefan, David; Zubík, Pavel; Hudec, Martin; Rudolf, Pavel (EDP Sciences, 2014-11-18)
    The decelerated swirling flow often breaks down into helical structure which is unstable and causes unsteady velocity and pressure fields. The numerical and experimental investigation of this flow pattern is carried out ...
  • The influence of spill-line geometry on a spray generated by a pressure-swirl atomizer 

    Malý, Milan; Janáčková, Lada; Jedelský, Jan; Jícha, Miroslav (EDP Sciences, 2016-03-28)
    An experimental investigation of characteristics of spray generated by a pressure-swirl atomizer (spill-return type) was performed using shadowgraphy and Phase-Doppler Anemometry (PDA). Several different geometries of the ...
  • Evaluation of Steadiness and Drop Size Distribution in Sprays Generated by Different Twin-Fluid Atomizers 

    Zaremba, Matouš; Mlkvik, Marek; Malý, Milan; Jedelský, Jan; Jícha, Miroslav (EDP Sciences, 2014-11-18)
    Dvoumédiové trysky prodělaly značný vývoj v posledních desetiletích. Jsou běžné v mnoha průmyslových aplikacích jako rozprašování paliv, rozprašování tavenin a v potravinářství. Tento článek se soustředí na zhodnocení ...
  • Comparison of turbulent models in the case of a constricted tube 

    Elcner, Jakub; Lízal, František; Jícha, Miroslav (EDP Sciences, 2016-11-15)
    The validation of a proper solution is an indispensable phase of every numerical simulation. Nowadays, many turbulent models are available, whose application leads to slightly different solution of flow behaviour depending ...
  • Influence of operating conditions and atomizer design on circumferential liquid distribution from small pressure-swirl atomizer 

    Malý, Milan; Janáčková, Lada; Jedelský, Jan; Jícha, Miroslav (EDP Sciences, 2017-05-12)
    The spray symmetry is an important aspect in most practical applications. However, it is often an overlooked parameter. A measurement of circumferential distribution was carried out by a circular-sectored vessel on several ...
  • Experimental validation of mathematical model for small air compressor 

    Tuhovčák, Ján; Hejčík, Jiří; Jícha, Miroslav; Šnajdárek, Ladislav (EDP Sciences, 2017-05-12)
    Development process of reciprocating compressors can be simplified by using simulation tools. Modelling of a compressor requires a trade-off between computational effort and accuracy of desired results. This paper presents ...
  • Simulation of the acoustic wave propagation using a meshless method 

    Bajko, Jaroslav; Niedoba, Pavel; Čermák, Libor; Jícha, Miroslav (EDP Sciences, 2017-05-12)
    This paper presents numerical simulations of the acoustic wave propagation phenomenon modelled via Linearized Euler equations. A meshless method based on collocation of the strong form of the equation system is adopted. ...
  • Airflow Measurement of the Car HVAC Unit Using Hot-wire Anemometry 

    Fojtlín, Miloš; Planka, Michal; Fišer, Jan; Pokorný, Jan; Jícha, Miroslav (EDP Sciences, 2016-03-28)
    Thermal environment in a vehicular cabin significantly influence drivers’ fatigue and passengers’ thermal comfort. This environment is traditionally managed by HVAC cabin system that distributes air and modifies its ...
  • Modelling fluid flow in a reciprocating compressor 

    Tuhovčák, Ján; Hejčík, Jiří; Jícha, Miroslav (EDP Sciences, 2015-05-06)
    Efficiency of reciprocating compressor is strongly dependent on the valves characteristics, which affects the flow through the suction and discharge line. Understanding the phenomenon inside the compressor is necessary ...
  • Comparison of methods for flow border detection in images of smoke visualization 

    Caletka, Petr; Pech, Ondřej; Jedelský, Jan; Lízal, František; Jícha, Miroslav (EDP Sciences, 2016-03-28)
    A separation of the flow region from the surroundings is an essential step in the analysis of smoke visualization images. The separation can be performed using several detection methods from the image segmentation group. ...
  • Investigation of the Airflow inside Realistic and Semi-Realistic Replicas of Human Airways 

    Lízal, František; Jedelský, Jan; Bělka, Miloslav; Zaremba, Matouš; Malý, Milan; Jícha, Miroslav (EDP Sciences, 2015-05-06)
    Measurement of velocity in human lungs during breathing cycle is a challenging task for researchers, since the measuring location is accessible only with significant difficulties. A special measuring rig consisting of ...
  • Modelling of fluid flow and heat transfer in a reciprocating compressor 

    Tuhovčák, Ján; Hejčík, Jiří; Jícha, Miroslav (IOP Conference Series, 2015-08-17)
    Efficiency of reciprocating compressor is strongly dependent on several parameters. The most important are valve behaviour and heat transfer. Valves affect the flow through the suction and discharge line. Heat flow from ...

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