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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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Numerical modelling of backward-facing step flow
Chára, Zdeněk ; Hoření, Bohumír
The contribution deals with a 3D numerical simulation of backward-facing step flow. The ratio of width to height of the channel before the expansion is 10:1, the height of the step is equal to the upstream channel height (expansion ratio is 2). Both the turbulent and the laminar flow regimes are simulated. The results will be used as a basis for experimental research, which will be focused on a mutual comparison of experimental methods – mainly LDA and PIV.
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Použití metody konečných objemů pro proudění s volnou hladinou
Hoření, Bohumír ; Chára, Zdeněk
The contribution deals with an application of discontinuous Galerkin method to free surface flow calculation. Both the super- and sub-critical flows are studied for steady and unsteady flow conditions. The numerical method is tested experimentally on flow over a broad crest weir of height to length ratio 1/8. Also VOF (volume of fluid) method is tested for the same geometrical configuration.
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Flow resistance of simple 2D bodies in wide range of Reynolds numbers
Hoření, Bohumír ; Chára, Zdeněk
Paper presents results of numerical simulation of flow resistance of selected 2D bodies (flat plate, cylinder and cylinder of square cross section) with help of program Fluent 6 for Reynolds numbers in the range Re=0.5 - 5000000 and the simulations are compared with available experimental data. The aim of the paper was to determine regions where the numerical calculations could give reasonably results.
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Použití "rovnic mělké vody" na proudění nenewtonských suspenzí
Hoření, Bohumír ; Chára, Zdeněk ; Vlasák, Pavel
The paper presents an attempt to use shallow water equations to solve a flow of non-Newtonian suspensions. Saint-Vennant set of equations of incompressible free surface flow in thin layers (frequently referred as "shallow water equations") forms a baseline for theoretical solution. The original set of equations established for Newtonian fluids is modified to solve also flow of non-Newtonian fluids with arbitrary rheological behaviour
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