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Comparison of Several RANS Modelling for the Pavia TRIGA Mark II Research Reactor
Introini, Carolina; Cammi, Antonio; Lorenzi, Stefano et al.
2018In Journal of Nuclear Engineering and Radiation Science
Peer reviewed
 

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Keywords :
CFD; turbolence
Abstract :
[en] Aim of this work is the comparison of different turbulent models based on the Reynolds Averaged Navier-Stokes (RANS) equations in order to find out which model is the most suitable for the study of the channel thermal-hydraulics of the TRIGA Mark II reactor. Only the steady state behaviour (i.e. the full power stationary operational conditions) of the reactor has been considered. To this end, the RAS (Reynolds-Averaged Simulation) models available in the open source CFD software OpenFOAM have been applied to the most internal channel of the TRIGA and assessed against a Large Eddy Simulation (LES) model. The results of the latter approach, expressed in terms of axial velocity, turbulent viscosity, turbulent kinetic energy, and temperature have been compared with the results obtained by the RAS models available in OpenFOAM (k − ε, k − ω and Reynolds Stress Transport). Heat transfer is taken into account as well by means of the turbulent energy diffusivity parameter. The simulation results demonstrate how, amongst the RAS models, the k − ω SST is the one whose results are closer to the LES simulation. This model seems to be the best one for the treatment of turbulent flow within the TRIGA subchannel, offering a good compromise between accuracy and computational requirements. Since it is much less expensive than an LES model, it can be applied even to full core calculation, in order to obtain accurate results with less computational effort.
Disciplines :
Engineering, computing & technology: Multidisciplinary, general & others
Author, co-author :
Introini, Carolina;  Politecnico di Milano > Energy Dept
Cammi, Antonio;  Politecnico di Milano > Dept. Energy
Lorenzi, Stefano;  Politecnico di Milano > Energy Dept.
Baroli, Davide ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Peters, Bernhard ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
External co-authors :
yes
Language :
English
Title :
Comparison of Several RANS Modelling for the Pavia TRIGA Mark II Research Reactor
Publication date :
2018
Event name :
26-th International Conference Nuclear Energy for New Europe
Event organizer :
Nuclear Society of Slovenia
Event date :
from 11-09-2017 to 14-09-2017
Audience :
International
Journal title :
Journal of Nuclear Engineering and Radiation Science
Publisher :
The American Society of Mechanical Engineers
Peer reviewed :
Peer reviewed
Focus Area :
Computational Sciences
Available on ORBilu :
since 29 November 2017

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