prof. Ing. František Pochylý, CSc.
E-mail:   pochyly@fme.vutbr.cz  Dept.:   Energy Institute Victor Kaplan Dept. of Fluid Engineering Position:   Professor Room:   A1/0519

Supervised courses:

• Diploma Project (M-FLI) (MD5)
• Fluid Power (MIM)
• Fluid Power Modeling (MTM)
• Fluid Structure Interactions (MZH)
• Fluid Structure Interactions (RIT)

Publications:

• POCHYLÝ, F.; KRAUSOVÁ, H.; FIALOVÁ, S.:
  Application of the Shannon-Kotelnik theorem on the vortex structures identification,
  IOP Conference Series-Earth and Environmental Science, pp.1-11, (2014), IOP Publishing
  conference paper
  akce: 27th IAHR Symposium on Hydraulic Machinery and Systems, Montreal, 22.09.2014-26.09.2014
• KLAS, R.; POCHYLÝ, F.; RUDOLF, P.:
  Analysis of novel low specific speed pump designs,
  Earth and Environmental Science, pp.1-11, (2014), IOP Science
  conference paper
  akce: 27th IAHR Symposium on Hydraulic Machinery and Systems, Montreal, 22.09.2014-26.09.2014
• FIALOVÁ, S.; POCHYLÝ, F.:
  Identification and experimental verification of the adhesive coefficient of hydrophobic materials,
  Proceedings of 18th International Seminar on Hydropower, pp.1-11, ISBN 978-3-9501937-9-4, (2014)
  conference paper
  akce: 18th International Seminar on Hydropower Plants, Vienna, 26.11.2014-28.11.2014
• JANČULA, D.; MIKULA, P.; MARŠÁLEK, B.; RUDOLF, P.; POCHYLÝ, F.:
  Selective method for cyanobacterial bloom removal: hydraulic jet cavitation experience, Springer Science+Business Media Dordrecht
  journal article in Web of Science
• KLAS, R.; POCHYLÝ, F.; RUDOLF, P.:
  Hydraulic Losses in the Spiral Case of Low Specific Speed Pumps,
  EPJ Web of Conferences, pp.1-8, ISBN 978-80-260-5375-0, (2014), EDP Sciences
  conference paper
  akce: Experimental fluid mechanics 2013, Kutná Hora, 19.11.2013-22.11.2013
• POCHYLÝ, F.; FIALOVÁ, S.; KRUTIL, J.:
  New mathematical model of certain class of continuum mechanics problems,
  Engineering Mechanics, Vol.21, (2014), No.1, pp.61-66, ISSN 1805-4633, Association for Engineering Mechanics
  journal article - other
• Pochylý František, Habán Vladimír, Fialová Simona:
  Bulk Viscosity - Constitutive Equations
• MALENOVSKÝ, E.; POCHYLÝ, F.; POHANKA, L.; CHLUD, M.:
  Application of the dynamic compliance method for fluid structure interaction,
  COMPUTERS & FLUIDS, Vol.44, (2011), No.1, pp.143-152, ISSN 0045-7930
  journal article - other

List of publications at Portal BUT

Abstracts of most important papers:

• POCHYLÝ, F.; KRAUSOVÁ, H.; FIALOVÁ, S.:
  Application of the Shannon-Kotelnik theorem on the vortex structures identification,
  IOP Conference Series-Earth and Environmental Science, pp.1-11, (2014), IOP Publishing
  conference paper
  akce: 27th IAHR Symposium on Hydraulic Machinery and Systems, Montreal, 22.09.2014-26.09.2014
  This paper presents a decomposition of unsteady vector fields, based on the principle of Shannon-Kotelnik theorem. The decomposition is derived from the Fourier transform of the Kotelnik series. The method can be used for the analysis of both forced and self-excited oscillation.
• KLAS, R.; POCHYLÝ, F.; RUDOLF, P.:
  Analysis of novel low specific speed pump designs,
  Earth and Environmental Science, pp.1-11, (2014), IOP Science
  conference paper
  akce: 27th IAHR Symposium on Hydraulic Machinery and Systems, Montreal, 22.09.2014-26.09.2014
  Centrifugal pumps with very low specific speed present significant design challenges. Narrow blade channels, large surface area of hub and shroud discs relative to the blade area, and the presence of significant of blade channel vortices are typical features linked with the difficulty to achieve head and efficiency requirements for such designs. This paper presents an investigation of two novel designs of very low specific speed impellers: impeller having blades with very thick trailing edges and impeller with thick trailing edges and recirculating channels, which are bored along the impeller circumference. Numerical simulations and experimental measurements were used to study the flow dynamics of those new designs. It was shown that thick trailing edges suppress local eddies in the blade channels and decrease energy dissipation due to excessive swirling. Furthermore the recirculating channels will increase the circumferential velocity component on impeller outlet thus increasing the specific energy, albeit adversely affecting the hydraulic efficiency. Analysis of the energy dissipation in the volute showed that the number of the recirculating channels, their geometry and location, all have significant impact on the magnitude of dissipated energy and its distribution which in turn influences the shape of the head curve and the stability of the pump operation. Energy dissipation within whole pump interior (blade channels, volute, rotor-stator gaps) was also studied.
• FIALOVÁ, S.; POCHYLÝ, F.:
  Identification and experimental verification of the adhesive coefficient of hydrophobic materials,
  Proceedings of 18th International Seminar on Hydropower, pp.1-11, ISBN 978-3-9501937-9-4, (2014)
  conference paper
  akce: 18th International Seminar on Hydropower Plants, Vienna, 26.11.2014-28.11.2014
  This work presents a methodology for the setting of an adhesive coefficient of a liquid flow over a hydrophobic surface. The starting point for the work was a study [5], which provides the general boundary condition for shear stress on a general curvilinear surface depending on the adhesive coefficients. The adhesive coefficient is determined on the basis of an experiment that utilizes the motion of a droplet on an inclined plane [7].
• JANČULA, D.; MIKULA, P.; MARŠÁLEK, B.; RUDOLF, P.; POCHYLÝ, F.:
  Selective method for cyanobacterial bloom removal: hydraulic jet cavitation experience, Springer Science+Business Media Dordrecht
  journal article in Web of Science
  The aim of this study was to investigate the suitability of hydraulic jet cavitation as a method for cyanobacterial water-bloom management. Effects of cavitation were studied on laboratory culture of the cyanobacterium Microcystis aeruginosa, on a culture of a green alga Chlorella kessleri (as a non-target species) as well as on a real cyanobacterial biomass with Microcystis sp. as a dominant species. Our results suggested that the cavitation treatment of cyanobacteria is capable of causing the disintegration of their gas vesicles. Using this treatment, up to 99 % removal efficiency of cyanobacteria was achieved. Moreover, no effect on cyanobacterial membrane integrity or metabolic activity was detected by flow cytometry; thus, hydraulic cavitation seems to be harmless from the viewpoint of possible release of cyanotoxins into the water column. The green algae (here C. kessleri) were not affected negatively by the cavitation, and thus, they may still act as the natural nutrient competitors of cyanobacteria in lakes, ponds or reservoirs treated by cavitation.
• KLAS, R.; POCHYLÝ, F.; RUDOLF, P.:
  Hydraulic Losses in the Spiral Case of Low Specific Speed Pumps,
  EPJ Web of Conferences, pp.1-8, ISBN 978-80-260-5375-0, (2014), EDP Sciences
  conference paper
  akce: Experimental fluid mechanics 2013, Kutná Hora, 19.11.2013-22.11.2013
  This contribution is focused on analysis of pressure losses in spiral case of centrifugal pump with thick trailing edges and with recirculation channels. Recirculation channels have different geometrical configuration and influence the size of available specific energy as well as hydraulic efficiency. Subsequently, the contribution analyses the flow in spiral case itself with respect to its function and its filling with liquid. Studied phenomena affect the research of pumps with low specific speed, the stability of specific energy characteristic curves and also the configuration of recirculation channels.