Universities Nuclear Technology Forum – University of Cambridge 18 th -20 th March 2009 CFD...
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Universities Nuclear Technology Forum – University of Cambridge
18th-20th March 2009
CFD Analysis of Operating CFD Analysis of Operating Reactor Systems and a Reactor Systems and a
Proposed “Generation IV” Proposed “Generation IV” DesignsDesigns
by
S. Rolfo & A. Keshmiri
Colleagues:
D.R. Laurence, M.A. Cotton and Y. Addad
School of Mechanical, Aerospace & Civil Engineering (MACE)
The University of Manchester
Manchester, M60 1QD
www.CFDtm.org
Summary
Fuel Pins in Current AGR reactors
Code_Saturne
A proposal for next generation IV reactors: Sodium Fast Reactor (SFR) fuel assembly
Conclusions
Fuel Elements in AGRs
Various Configurations
1)Multi-start
2)Transverse
3) Hoop
4) Smooth
2-dimensional approach
Test CasesSquare Rib Profile (SRP)
Transverse Rib Profile (TRP)
Multi-Start Rib Profile (MSRP)
Turbulence models:1) Chen & Kim LRN k-ε model2) Wilcox LRN k-ω model3) Lien & Durbin v2f model
STAR-CD Results: contoursStreamwise velcity contour: LRN Chen & Kim k-ε model
Relative Pressure contour: LRN Wilcox k-ω model
STAR-CD Results: Lien & Durbin v2f model
y/k=1
y/k=0.1
STAR-CD Results: Lien & Durbin v2f model
Code_Saturne
Code developed by EdF and now open source downloadable from:
www.code-saturne.org
Unstructured
Co-located, Finite Volume Formulation
Different turbulent models (both RANS and LES)
Incompressible or expandable flows with or without heat transfer
Different modules: radiative heat transfer, combustion, magneto-hydrodynamics, compressible flows, two-phase flows
Possible coupling with Code_Aster for structural analysis and with Syrthes for thermal analysis.
Parallel code coupling capabilities (awarded the Gold medal on HPCx)
TWiki collaborative website with forum and developments: http://cfd.mace.manchester.ac.uk/twiki/bin/view/Saturne/WebHome
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SFR fuel assembly: Case presentation Flow parameters:• P/D = 1.1 • Re = 11000 (Bulk vel = 1 m/s)• Working fluid liquid sodium
• = 847 kg/m3• µ = 2.55 10-4 Kg/m/s• Pr = 5 10-3
SFR test case
SFR test case: comparison k- and Rij
Rij (SSG)k-
Conclusions
SFR fuel assemblyPreliminary RANS calculations shows a completely
different flow field respect to rod bundle in smooth configuration (no wire).
k- and Rij SSG models give very similar results from a qualitatively point of view, but very different quantitatively
Possible LES or Hybrid RANS/LES calculationsAGR
Three different rib profiles have been tested and they all showed similar profiles for velocity, temperature and pressure.
Lien & Durbin v2f model was proved to be the best model for this test case.