National Repository of Grey Literature 513 records found  beginprevious499 - 508next  jump to record: Search took 0.00 seconds. 
Numerická simulace aerodynamické interakce křídla a trupu
Šimurda, David ; Popelka, Lukáš ; Zelený, L. ; Matějka, Milan
In order to investigate and understand extent of the wing-body interaction effects taking place during operation of a particular self-launching sailplane, commercial code Fluent 6.3 was used for numerical simulation of flow past a simplified model of TST-10a. Several methods were used to identify vortex structures originating due to interference effects in this part of the aircraft. 3D effects and distortions of pressure and velocity distributions taking place in the junction of the body and the fuselage were observed.
Interpretace CFD generovaných oscilací svazku bublin pro analýzu provozu bioreaktoru typu bublaná kolona
Fialová, Marie ; Staykov, P. ; Vlaev, S. D.
The aim of this study is to generate the unsteady flow behaviour of a bubble column bioreactor and to interpret its flow conditions in terms of oxygen availability in bioreactor performance analysis.
Numerické a experimentální řešení nelineární aeroelastické odezvy nosníku mostu
Pospíšil, Stanislav ; Král, Radomil ; Náprstek, Jiří ; Hoffer, R. ; Lachmann, S.
Analysis of the bridge girder under self-excited load is performed numericaly and experimentally.
Lokální charakterizace tokového pole v bublané koloně generované pomocí CFD
Fialová, Marie ; Staykov, P. ; Vlaev, S.D.
This study is aimed at 3-D simulation of bubble column using commercial CFD code Fluent and generating experimental local gas hold-up distribution profiles at different bed height positions, comparing these profiles with model solutions and demonstrating the flow field variation (vector plots for air and liquid movement) obtained by CFD modeling. Overall gas volume fraction values predicted by the CFD simulation were matched to measured values and showed comparable. CFD modeling was found to describe satisfactorily bubble bed formation in the bubble column operating with water and low viscosity solution.
Numerical simulation of the fire diffusion in mining passage
Michalec, Zdeněk ; Kozubková, M. ; Bojko, M.
Numerical simulations of the stable stratified flow in a 3D passage affected by a thermal source have been calculated with a standard k-e model. Furthermore, the radiation heat transfer model is implemented and species transport equations are defined too. The model allows a correct stratification and produces fairly accurate heat wall transfer.
Numerical solution of some 2D incompressible flow using dynamical effects
Honzátko, R. ; Horáček, Jaromír ; Kozel, K.
The work deals with a numerical solution of 2D inviscid incompressible flow throuht a cascade and over a profile in a channel. The finite volume method in a form of cell-centered scheme at triangular and qudrilateral mesh is used. the composite scheme applied to a numerical solution consists of more dissipative part adn less dissipative par. Governign system of equations is the system of Euler equations.
Modelling of cavitated flows in hydraulic machinery using viscous flow computation and bubble dynamics model
Sedlář, M. ; Maršík, František ; Šafařík, Pavel
Numerical solution of the 3D Reynolds averaged Navier-Stokes equation is based on FEM. The turbulence is modelled through the high Reynolds number k-epsilon model. The cavitation region is modelled as a region of the lower density . The local radius of cavitating bubbles is obtained as a solution of Rayleigh-Plesset equation. The flow past the blades of an axial flow mixer is calculated.
Počítačová simulace a experimentální studie hydrodynamického chování toku tuhá fáze kapalina
Křišťál, Jiří ; Jiřičný, Vladimír ; Staněk, Vladimír
In this paper basic parameters of multiphase flow simulation and experimental determination of particle velocity profiles are described.

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