Reference : Comparison of Several RANS Modelling for the Pavia TRIGA Mark II Research Reactor
Scientific congresses, symposiums and conference proceedings : Paper published in a journal
Engineering, computing & technology : Multidisciplinary, general & others
Computational Sciences
http://hdl.handle.net/10993/33321
Comparison of Several RANS Modelling for the Pavia TRIGA Mark II Research Reactor
English
Introini, Carolina mailto [Politecnico di Milano > Energy Dept]
Cammi, Antonio mailto [Politecnico di Milano > Dept. Energy]
Lorenzi, Stefano mailto [Politecnico di Milano > Energy Dept.]
Baroli, Davide mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Peters, Bernhard mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
2018
Journal of Nuclear Engineering and Radiation Science
The American Society of Mechanical Engineers
Yes
International
26-th International Conference Nuclear Energy for New Europe
from 11-09-2017 to 14-09-2017
Nuclear Society of Slovenia
[en] CFD ; turbolence
[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.
Researchers ; Professionals
http://hdl.handle.net/10993/33321

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