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| rdf:type
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| Description
| - This work deals with the numerical simulation of fluid flow (for tested case water was applied) in the vessel without baffles focusing on the creation of the vortex and its shape on the free surface. The vessel is stirred by impeller with three curved blades with particular geometry. CFD program ANSYS FLUENT is used for the simulations. Steady flow regime is assumed. SST k-omega and Reynolds Stress turbulent models are used for the simulation of turbulence and MRF approach is used for simulation of impeller motion. VOF model is used to solve multiphase flow. The one geometry of stirred vessel without baffles is solved and the sensitivity analyses of mesh roughness were performed. Higher rotation speeds of 200, 250 and 300 rpm are set to establish a large central vortex. Further experiments were carried out with the same geometry. The shapes of vortices and flow fields are compared for different meshes and turbulent models. Furthermore, the value of power numbers and depth of vortices are compared. The results showed that application of two-equation turbulent models isn’t suitable in this case. Despite the good convergence of the SST k-omega model its solution isn’t correct and the shape of vortex doesn’t correspond with experiment. More realistic shape of the central vortex is achieved by using the model Reynolds Stress, which has worse convergence, but it is preferable in cases, where is the dominant anisotropic turbulence (strong central vortex). Power number obtained by simulations with the model Reynolds Stress coincides with the value obtained by experiment. The results also showed that the obtained shapes of vortices and flow fields aren’t significantly sensitive to mesh roughness. Also power numbers are almost identical. Mesh roughness has the effect on the sharpness of the interface between phases, therefore it is appropriate to use finer mesh where place of the interface is expected.
- This work deals with the numerical simulation of fluid flow (for tested case water was applied) in the vessel without baffles focusing on the creation of the vortex and its shape on the free surface. The vessel is stirred by impeller with three curved blades with particular geometry. CFD program ANSYS FLUENT is used for the simulations. Steady flow regime is assumed. SST k-omega and Reynolds Stress turbulent models are used for the simulation of turbulence and MRF approach is used for simulation of impeller motion. VOF model is used to solve multiphase flow. The one geometry of stirred vessel without baffles is solved and the sensitivity analyses of mesh roughness were performed. Higher rotation speeds of 200, 250 and 300 rpm are set to establish a large central vortex. Further experiments were carried out with the same geometry. The shapes of vortices and flow fields are compared for different meshes and turbulent models. Furthermore, the value of power numbers and depth of vortices are compared. The results showed that application of two-equation turbulent models isn’t suitable in this case. Despite the good convergence of the SST k-omega model its solution isn’t correct and the shape of vortex doesn’t correspond with experiment. More realistic shape of the central vortex is achieved by using the model Reynolds Stress, which has worse convergence, but it is preferable in cases, where is the dominant anisotropic turbulence (strong central vortex). Power number obtained by simulations with the model Reynolds Stress coincides with the value obtained by experiment. The results also showed that the obtained shapes of vortices and flow fields aren’t significantly sensitive to mesh roughness. Also power numbers are almost identical. Mesh roughness has the effect on the sharpness of the interface between phases, therefore it is appropriate to use finer mesh where place of the interface is expected. (en)
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| Title
| - Steady CFD simulation of central vortex formation at the free surface in the vessel without baffles stirred by impeller with three curved blades
- Steady CFD simulation of central vortex formation at the free surface in the vessel without baffles stirred by impeller with three curved blades (en)
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| skos:prefLabel
| - Steady CFD simulation of central vortex formation at the free surface in the vessel without baffles stirred by impeller with three curved blades
- Steady CFD simulation of central vortex formation at the free surface in the vessel without baffles stirred by impeller with three curved blades (en)
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| skos:notation
| - RIV/68407700:21220/14:00221522!RIV15-MSM-21220___
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/68407700:21220/14:00221522
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - Numeric simulation; CFD; FLUENT; Mixing; Stirred vessel; Free surface; Vortex; VOF (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
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| http://linked.open...iv/tvurceVysledku
| - Jirout, Tomáš
- Skočilas, Jan
- Vlček, Petr
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| http://localhost/t...ganizacniJednotka
| |
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