CFD-2012-01_CAST-Tilted -New mesh generation-
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Transcript of CFD-2012-01_CAST-Tilted -New mesh generation-
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CFD-2012-01_CAST-Tilted-New mesh generation-
2012-02-23 E. Da Riva
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Summary
2012-02-23 E. Da Riva
1. Mesh generation2. First results3. Thermal b.c. improvement?
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2012-02-23 E. 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.msh6 106 cells
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2012-02-23 E. 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
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2012-02-23 E. 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.
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2012-02-23 E. Da Riva
First results
• Ideal Gas.• Pressure 37.1 mbar• Hot window (Tw=63 K, TCB=1.798K)
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2012-02-23 E. Da Riva
Velocity @ MFB
Fluent
Star-ccm+
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2012-02-23 E. Da Riva
Temperature @ MFB
Fluent
Star-ccm+
• Sleeve not taken into account in the Star-ccm+ simulations.
b.c. T = 1.798 K
b.c. T = 1.798 K
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2012-02-23 E. Da Riva
First results
• Ideal Gas.• Pressure 37.1 mbar• Hot window (Tw=63 K, TCB=1.798K)
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2012-02-23 E. Da Riva
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Dens
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Axial position [m]
Star-ccm (Van Der Waals)Fluent (ideal gas)
Density along axis
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2012-02-23 E. Da Riva
Thermal b.c. improvement?