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CFD-2012-01_CAST-Tilted -New mesh generation-

CFD-2012-01_CAST-Tilted -New mesh generation-. Summary. Mesh generation First resul ts Thermal b.c . improvement?. Symmetry. MESH: CAST-15Feb2012.msh 6 10 6 cells. Focus on modeling and understanding physical phenomena (instead of reproducing the exact experimental number of moles)

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CFD-2012-01_CAST-Tilted -New mesh generation-

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

  2. Summary • Mesh generation • First results • Thermalb.c. improvement? E. Da Riva

  3. Symmetry • MESH:CAST-15Feb2012.msh • 6 106 cells • 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. E. Da Riva

  4. 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 E. Da Riva

  5. 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. E. Da Riva

  6. First results • Ideal Gas. • Pressure 37.1 mbar • Hot window (Tw=63 K, TCB=1.798K) E. Da Riva

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

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

  9. First results • Ideal Gas. • Pressure 37.1 mbar • Hot window (Tw=63 K, TCB=1.798K) E. Da Riva

  10. Density along axis E. Da Riva

  11. Thermal b.c. improvement? E. Da Riva

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