1. Channel flow benchmarks
DNS datasets to validate Code_Saturne
Effect of complex grids
 hexa, non-conform, tetra
Low Reynolds number tests Ret = 100
no turbulence model
Ret = 395 tests
subgrid scale model tests
Towards high Reynolds numbers
subgrid scale models at high Reynolds numbers

2. Channel flow benchmarks: « classic » DNS
DNS Ret = 180
Box 4 x 2 x 2, Grid 192 x 128 x 160 (4M cells)
 Same grid as Mansour, Kim & Moin
Results include
velocity, shear and normal stresses (<u>, <u’v’> etc… )
Triple correlations (<v’u’u’> etc…)
Terms in turbulent kinetic energy budget
Terms in the components of each budget

3. Channel flow benchmarks: DNS Ret =180
• Grid adapted for a spectral code
• but applied to a non spectral code

4. Channel flow benchmarks: DNS Ret =180
• Grid adapted for a spectral code
• but applied to a non spectral code

5. Channel flow benchmarks: DNS Ret =180
• Grid adapted for a spectral code
• but applied to a non spectral code

6. Channel flow benchmarks: DNS Ret =180

7. Channel flow benchmarks: DNS Ret =180

8. Channel flow benchmarks: DNS Ret =180

9. Channel flow benchmarks: Code_Saturne test grids
Hexahedral Non-conform (hexa)
Box 2 x 2 x 
440,000 elements
Tetrahedral

10. Channel flow benchmarks: Ret = 100
DNS 880k cells
 for same box size
tests 440k cells
Tetra
poorly resolved
difference in grid on
each wall
Hexa
too coarse at wall

11. Channel flow benchmarks: Ret = 100
turbulence kinetic energy
weaknesses of each case become more clear

12. Channel flow benchmarks: Ret = 395
• velocity

13. Channel flow benchmarks: Ret = 395
• shear stress

14. Channel flow benchmarks: Ret = 395
• normal stresses

15. Channel flow benchmarks: Ret = 395
• tke

16. Channel flow benchmarks: high Reynolds numbers
Box 6 x 2 x2, Grid 11 x 11 x 11 (1.3k cells)

17. Detail of the tubes that make up a bundle inside a SFR reactor
Thermal
radiation
·        Ensure the tubes don’t touch,
Ensure that sodium cannot get trapped (particularly important with respect to the neutronic reactions),
·        Reduce vibrations within the tube bundle,
Improve the mixing near the heater and increase the rate of heat exchange.

18. First attempts to simulate the fluid
A z=100mm
A z=140mm