Comparison of turbulence model predictions in rod bundles with supercritical up-flow

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dc.contributor.authorBergmann, Cale
dc.contributor.examiningcommitteeWang, Bing-Chen (Mechanical Engineering) Hollaender, Hartmut (Civil Engineering)en_US
dc.contributor.supervisorChatoorgoon, Vijay (Mechanical Engineering) Ormiston, Scott (Mechanical Engineering)en_US
dc.date.accessioned2016-01-11T13:59:18Z
dc.date.available2016-01-11T13:59:18Z
dc.date.issued2015en_US
dc.date.issued2016en_US
dc.degree.disciplineMechanical Engineeringen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractVertical up-flow of supercritical fluid in the subchannel of a heated rod bundle was numerically simulated using the Computational Fluid Dynamics (CFD) codes ANSYS CFX and ANSYS FLUENT. A total of seven cases from three different sets of experiments were simulated. Three-dimensional steady-state predictions of fluid velocity, pressure, and temperature were made using five versions of two-equation RANS turbulence models with accompanying wall treatments. In addition, the temperature distribution in a solid region comprising a heater and sheathing was also computed in some cases. The k-epsilon turbulence model, implemented using CFX and scalable wall functions, provided the numerical results that have the smallest overall deviation from experimental results for three of the seven cases, and predicts the experimental data of the remaining four cases reasonably well, unlike other turbulence models that severely over-predict the experimental data for wall surface temperature.en_US
dc.description.noteFebruary 2016en_US
dc.identifier.citationC. Bergmann, S. J. Ormiston and V. Chatoorgoon, "Sensitivity Studies of SST Turbulence Model Parameters on the Prediction of 7-Rod Bundle Benchmark Experiments," in The 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR7), Helsinki, Finland, 2015.en_US
dc.identifier.citationC. Bergmann, S. J. Ormiston and V. Chatoorgoon, "Sensitivity Studies of Shear Stress Transport Turbulence Model Parameters on the Prediction of Seven-Rod Bundle Benchmark Experiments," Journal of Nuclear Engineering and Radiation Sciences, vol. 2, no. 1, 2016.en_US
dc.identifier.urihttp://hdl.handle.net/1993/31016
dc.language.isoengen_US
dc.publisherVTT Technical Research Centre of Finland Ltden_US
dc.publisherASMEen_US
dc.rightsopen accessen_US
dc.subjectSupercriticalen_US
dc.subjectTurbulence modelsen_US
dc.subjectRod bundlesen_US
dc.subjectNumericalen_US
dc.subjectCFDen_US
dc.subjectCFXen_US
dc.subjectFLUENTen_US
dc.subjectHeat transfer deteriorationen_US
dc.titleComparison of turbulence model predictions in rod bundles with supercritical up-flowen_US
dc.typemaster thesisen_US
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