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The development of surface vortices in strongly rotating flow in a cylindrical vessel : numerical simulation
Publikationstyp
Conference Paper
Date Issued
2015
Sprache
English
Institut
Start Page
2020
End Page
2033
Citation
International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015. - Red Hook, NY. - Vol. 3 (2015): pp. 2020-2033 (2015)
Contribution to Conference
Scopus ID
Publisher
Curran
In many industrial applications, e.g. the emergency core cooling in nuclear power plants, the reliable operation of pumps is an indispensable requirement which can only be guaranteed when gas entrainment into the pumps is avoided. One of the main sources of gas entrainment are surface vortices which may develop at surfaces between a liquid and a gas if the liquid level is below a critical submergence of the pump intake. Thus, the determination of the critical submergence is a safety relevant matter for the design of pump intakes. Therefore, a test facility was built at the Hamburg University of Technology which provides experimental data on the shape of surface vortices in vertical vessels and strongly rotating flow. In this paper CFD results are presented concerning these experiments. The CFD simulations include a single phase approach as well as free surface simulations. To obtain the surface deformation in the single phase case the corresponding simulations are combined with an analytical vortex model whose applicability is discussed. The results from the single phase and the free surface simulations are then compared with each other and the experiment in order to assess the efficiency of the different strategies to compute the shape of surface vortices.
Subjects
Burgers-rott model
CFD simulations
Necessary submergence
Surface deformation
Surface vortices
DDC Class
530: Physik
600: Technik
620: Ingenieurwissenschaften