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Nestacionární charakteristiky impaktního proudění do korýtkové kavity
Knob, Martin ; Antoš, Pavel ; Adamec, J.
In this contribution, the unsteady behaviour of a jet, impinging into a trough cavity is described. The mechanism of the switching of the jet is clarified and the effect of the impingement angle is discussed. The problem was studied both experimentally and numerically. The numerical investigation is performed using a commercial package Fluent 6.1, while the experimental data are obtained using the hot- wire probe. The experimental and the numerical data are compared and discussed.
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Comparison of experimental and numerical data in 2D impact flow
Knob, Martin ; Antoš, Pavel ; Adamec, J.
In the contribution, the experimentally obtained and the numerically computed data in a two- dimensional impinging jet flow are compared. The calculations were performed using a commercial solver Fluent v. 6.1, while the experimental data were obtained using a hot- wire probe. In the calculations, both the k-SST and the RSM models of turbulence were employed. The comparison has been done for three various jet hydraulic diamater and jet mean velocity based Reynolds numbers, 2800, 8400 and 1400, respectively.
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Modelování proudění s volnou hladinou pomocí VOF
Chára, Zdeněk ; Hoření, Bohumír
The contribution deals with an application of the method VOF ("Volume of Fluid" implemented in Fluent software) on free surface flow over obstacles placed on a channel bottom. The numerical results are compared with experimental observations of flows over two square cross section cylinders and over broad crest weir.
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FE heat conduction modeling of Rubber segment at mechanical harmonic excitation
Šulc, Petr ; Pešek, Luděk
This contribution deals with the numerical finite element modeling of rubber sample temperature field at the harmonic mechanical loading when the heat generated by absorbed mechanical energy is substituted by the constant heat rate input. As the study case a segment of the rubber-damped railway tram wheel was chosen. This segment was experimentally tested and the results were used for tuning the parameters of the FE model of heat conduction and transfer in program ANSYS 6.1.
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Chlazení vinutí synchronního motoru s využitím tepelné trubice
Vlach, Radek ; Ondrůšek, Č.
The paper is concerned with computational simulation of stator winding heating of synchronous machine. Software ANSYS 6.1 was used for computational modeling. Computational model consider heat pipe in the middle of winding slot. The results of computer simulation show effect of heat pipe on winding cooling. Other results show effect of heat pipe position and size of cooling surface on winding heating.
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Metodika navrhování řasových fotobioreaktorů: matematické modelování hydrodynamického míchání a předpověď parametrů světelného režimu
Papáček, Š. ; Rálek, P. ; Kopecký, Jiří ; Masojídek, Jiří ; Štys, Dalibor ; Petera, K.
Computational fluid dynamics (CFD) and process simulation are important tools for the design and optimisation of biochemical processes. In this contribution, the photobioreactor design methodology based on CFD is proposed. A widely used CFD package (Fluent 6.1, by Fluent Inc.) performs a numerical approximation of microalgae trajectory (pathline) inside tubular photobioreactor. Consequently, prediction of the level of hydrodynamic mixing and corresponding light regime inside the photobioreactor with effective use of strong light by high-density algal culture is possible. In the first approach, the algal suspension is considered as a single-phase incompressible viscous Newtonian fluid, which fills the whole section of the photobioreactor photic zone. Coupling the cell trajectories with the corresponding light conditions, the light histories of single cells are obtained. These records contain complete information about light regime in photobioreactor. Computer simulations for various photobioreactor design parameters and operating conditions allow to establish the quantitative relation between variables representing design and operating parameters and light regime parameters. Thus the problem of optimal PBR design could be resolved.
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