Development of a two-way fluid-structure interaction model for pipe system analysis
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Typ
Examensarbete för masterexamen
Master Thesis
Master Thesis
Program
Nuclear engineering, MSc
Publicerad
2014
Författare
Hempel, Janna
Lindgren, Oskar
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Pipe systems in nuclear power plants must be able to withstand forces caused by changes in the system conditions. To investigate how the pipe system reacts due to these changes mechanics and structural mechanics calculations are performed . At Ringhals AB, a two step simulation is performed where the output from the uid mechanics calculations is used as an input for the structural mechanics calculations. This one-way uid-structure interaction does not take into account that the structural movement can in uence the ow and pressure of the uid, which may yield higher forces that the system has to withstand. This master thesis develops a method for modelling two-way uid-structure interaction, by using the method of characteristics to transform the partial differential equations of mass and momentum into ordinary differential equations yielding the pressure and ow of the uid. Matlab is used for calculating these properties, and the toolbox CalFEM is used when calculating the structural mechanics, the two solvers are coupled to obtain the two-way interaction. The developed Matlab program show satisfactory results both when comparing the two solvers separately to software used at Ringhals AB, and when comparing with results obtained from Adina, a software for calculating two-way uid-structure interaction. The Matlab program provides the user a familiar and easy way of building pipe systems and evaluating how the uid properties changes and how the pipe system reacts on these changess.
Beskrivning
Ämne/nyckelord
Grundläggande vetenskaper , Energi , Fysik , Hållbar utveckling , Basic Sciences , Energy , Physical Sciences , Sustainable Development