1. CFD-2012-01_CAST-Tilted -New mesh generation- 2012-02-23E. Da Riva

2. Summary 2012-02-23E. Da Riva 1.Mesh generation 2.First results 3.Thermal b.c. improvement?

3. 2012-02-23E. Da Riva Symmetry Focus on modeling and understanding physical phenomena (instead of reproducing the exact experimental number of moles) Interconnection between cold-bores neglected (Adiabatic in most simulations + Horizontal -> small influence on natural convection) Axisymmetric fluid domain -> good mesh Symmetry plane b.c. -> better exploitation of computational resources No changes for the thermal b.c. MESH: CAST-15Feb2012.msh 6 10 6 cells

4. 2012-02-23E. Da Riva Wall meshing Cell thickness close to wall: 50 μm Grow ratio: 1.2 # layers: 10 Cell longitudinal size increasing from 1 mm at the windows up to 15 mm at 3.5 m from the cold-bore center

5. 2012-02-23E. Da Riva Polypropylene window Thicker window with fake non-isotropic conductivity did not work. Propylene window modeled with real thickness and conductivity. Non-conformal interface between steel net and poplypropylene.

6. 2012-02-23E. Da Riva First results Ideal Gas. Pressure 37.1 mbar Hot window (T w =63 K, T CB =1.798K)

7. 2012-02-23E. Da Riva Velocity @ MFB Fluent Star-ccm+

8. 2012-02-23E. Da Riva Temperature @ MFB Fluent Star-ccm+ Sleeve not taken into account in the Star-ccm+ simulations. b.c. T = 1.798 K

9. 2012-02-23E. Da Riva First results Ideal Gas. Pressure 37.1 mbar Hot window (T w =63 K, T CB =1.798K)

10. 2012-02-23E. Da Riva Density along axis

11. 2012-02-23E. Da Riva Thermal b.c. improvement?