CFD-2012-01_CAST-Tilted
-New mesh generation-
2012-02-23
E. Da Riva
Summary
1.
2.
3.
Mesh generation
First results
Thermal b.c. improvement?
2012-02-23
E. Da Riva
Symmetry
MESH:CAST-15Feb2012.msh
6 106 cells
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•
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•
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.
2012-02-23
E. Da Riva
Wall meshing
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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
2012-02-23
E. Da Riva
Polypropylene window
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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.
2012-02-23
E. Da Riva
First results
• Ideal Gas.
• Pressure 37.1 mbar
• Hot window (Tw=63 K, TCB=1.798K)
2012-02-23
E. Da Riva
Velocity @ MFB
Fluent
Star-ccm+
2012-02-23
E. Da Riva
Temperature @ MFB
b.c. T = 1.798 K
Fluent
b.c. T = 1.798 K
Star-ccm+
• Sleeve not taken
simulations.
2012-02-23
into
E. Da Riva
account
in
the Star-ccm+
First results
• Ideal Gas.
• Pressure 37.1 mbar
• Hot window (Tw=63 K, TCB=1.798K)
2012-02-23
E. Da Riva
Density along axis
0.9
Star-ccm (Van Der Waals)
Fluent (ideal gas)
0.8
0.7
Density [kg m-3]
0.6
0.5
0.4
0.3
0.2
0.1
0
-6
2012-02-23
-4
-2
0
Axial position [m]
E. Da Riva
2
4
6
Thermal b.c.
improvement?
2012-02-23
E. Da Riva