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National Repository of Grey Literature

18 records found  11 - 18  jump to record:

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	Numerical simulation of jet flow using LES Louda, Petr ; Kozel, K. ; Příhoda, Jaromír The work deals with the numerical method for the large eddy simulation (LES) of incompressible flow. Governing system of filtered Navier-Stokes equations is completed by the Smagorinsky turbulence model and the Poisson equation is used for pressure instead of the continuity equation. The numerical method is based on an explicit scheme with fourth order accurate central approximation for convection and resolved diffusion. Preliminary results for the plane turbulent free jet are shown. Problem of the prescription of boundary conditions is discussed in detail. Detailed record
	Numerické řešení proudění v turbínové mříži s užitím různých modelů turbulence Fořt, J. ; Dobeš, J. ; Fürst, J. ; Halama, J. ; Kozel, K. ; Louda, Petr ; Příhoda, Jaromír The paper shows examples of the use of in-house developed numerical codes in the design procedure of a turbine blade cascade. Numerical results of the flow field in axial turbine stator cascade with alternative shapes of blade profiles achieved by these codes are presented. Further, effects of grid, numerical scheme and turbulence model on numerical results are discussed. A model of laminar/turbulent transition together with preliminary numerical results for flow through a stator turbine cascade is also presented. Detailed record
	Numerické řešení subsonického a transsonického turbulentního proudění dvourozměrnými mřížemi Kozel, Karel ; Louda, P. ; Příhoda, Jaromír The work deals with the numerical solution of 2D steady turbulent subsonic and transonic flows through turbine cascades. The numerical solution is carried out by the finite volume method using an implicit AUSM scheme. The Reynolds averaged Navier-Stokes equations are closed by the eddy viscosity SST model and/or the explicit algebraic Reynolds stress model. Numerical results are compared with experimental data for two turbine blade cascades – SE1050 and NT24. Detailed record
	Numerické řešení dvourozměrného proudění v kanálu Trefilík, J. ; Šimonek, J. ; Kozel, K. ; Příhoda, Jaromír The work deals with the numerical simulation of viscous incompressible and compressible 2D flows. Numerical solution was carried out by the finite volume method and the Mc Cormack predictor-corrector scheme. Turbulent flow is modelled by an algebraic model and by the two-equation model. Numerical solution of incompressible and compressible flow over the DCA profile in a channel is presented. Detailed record
	Project: Transition to turbulence modeling Horák, V. ; Hoření, Bohumír The project is focused on the transition from laminar to turbulent flow modelling. Developed code will be formulated in such a way to enable an effective parallel processing. Detailed record
	Modelling of flow over a backward-facing step in streams with various turbulence level Příhoda, Jaromír ; Sedlář, M. Turbulent flow over a backward-facing step in streams with a various turbulence level was numerically simulated using software ANSYS CFX-5. Numerical solution carried on with the two-equation SST model and/or with a k-omega based Reynolds stress model was compared with experimental data obtained for three different values of free-stream turbulence level. The predicted length of the recirculation region corresponds well with experimental data but the dependence of the ratio xr/h on free-stream turbulence level is smaller. Detailed record
	Numerical simulation of flow in a curved channel with the square cross-section Příhoda, Jaromír ; Vlášek, Karel The paper presents results of numerical simulation of water flow in a 90-deg curved channel with the square cross-section. Obtained loss coefficients correspond to data given in literature. Detailed record
	Numerical simulation of the wall jet on a circullar cylinder Příhoda, Jaromír ; Sedlář, M. The wall jet on a circular cylinder was simulated numerically using the CFX-TASCflow software. The calculation was carried out for the relative slot height h/R=0.04 and the Reynolds number Reh from 3500 to 21000. Results obtained by the k-eps model and by the BSL and SST models proposed by Menter were compared with experimental data and with empirical relations. Detailed record

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