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Statements

Subject Item
n2:RIV%2F68407700%3A21220%2F14%3A00217464%21RIV15-MSM-21220___
rdf:type
skos:Concept n8:Vysledek
dcterms: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 from 200 to 350 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 from 200 to 350 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.
dcterms: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
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
skos:notation
RIV/68407700:21220/14:00217464!RIV15-MSM-21220___
n3:aktivita
n16:S
n3:aktivity
S
n3:dodaniDat
n7:2015
n3:domaciTvurceVysledku
n11:9635440 n11:8419515
n3:druhVysledku
n20:D
n3:duvernostUdaju
n12:S
n3:entitaPredkladatele
n19:predkladatel
n3:idSjednocenehoVysledku
47471
n3:idVysledku
RIV/68407700:21220/14:00217464
n3:jazykVysledku
n18:eng
n3:klicovaSlova
Numeric simulation; CFD; FLUENT; Mixing; Stirred vessel; Free surface; Vortex; VOF
n3:klicoveSlovo
n4:Stirred%20vessel n4:VOF n4:FLUENT n4:Numeric%20simulation n4:Vortex n4:Free%20surface n4:Mixing n4:CFD
n3:kontrolniKodProRIV
[D1632927EB2D]
n3:mistoKonaniAkce
Praha
n3:mistoVydani
Praha
n3:nazevZdroje
Studentská tvůrčí činnost 2014
n3:obor
n10:JP
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
2
n3:rokUplatneniVysledku
n7:2014
n3:tvurceVysledku
Jirout, Tomáš Vlček, Petr
n3:typAkce
n5:EUR
n3:zahajeniAkce
2014-04-08+02:00
s:numberOfPages
14
n13:hasPublisher
České vysoké učení technické v Praze. Fakulta strojní
n9:isbn
978-80-01-05484-0
n14:organizacniJednotka
21220