PS Ventilation Duct simulation Sylwia Wojnarska 12 th
- Slides: 11
PS Ventilation Duct simulation Sylwia Wojnarska 12 th July 2012 1
PS Ventilation Sylwia Wojnarska 12 th July 2012 2
Duct in the ceiling – mesh and boundary conditions • Geometry – half of a crossection of a duct – symmetry • 1/16 of the whole tunnel – 39 m • Hole Ø 0, 05 m, every 0, 5 m • Mass flux – 30000 m³/h • Surface 2, 6 m x 0, 55 m • Velocity in the inlet – 2, 91 m/s • Viscosity model K-ɛ • 1 mln elements Sylwia Wojnarska 12 th July 2012 3
Duct in the ceiling – results Covergence monitors: • Mass balance – inlet+outlet = 0 • Pressure in the inlet - stable Mass distribution Almost uniform distribution The same mass flux every hole The same velocity every hole No pressure drop along the duct Only pressure drop in the holes 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 -0. 005000000 • • • -0. 010000000 kg/s -0. 015000000 -0. 020000000 -0. 025000000 -0. 030000000 -0. 031709053 -0. 035000000 Sylwia Wojnarska outlet 12 th July 2012 -0. 033064028 4
Duct in the ceiling – results Sylwia Wojnarska 12 th July 2012 5
Duct in the ceiling – results Sylwia Wojnarska 12 th July 2012 6
Duct on the bottom – mesh and boundary conditions • • Sylwia Wojnarska Geometry – whole crossection of the duct 1/16 of the whole tunnel – 39 m Hole Ø 0, 05 m, every 0, 5 m Mass flux – 30000 m³/h Surface 0, 64 m² Velocity in the inlet – 5, 1 m/s Viscosity model K-ɛ 4 mln elements 12 th July 2012 7
Duct on the bottom – results Covergence monitors: • Mass balance – inlet+outlet = 0 • Pressure in the inlet - stable -0. 0050 Mass distribution • • • Almost uniform distribution The same mass flux every hole The same velocity every hole No pressure drop along the duct Only pressure drop in the holes 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 -0. 0100 -0. 0150 -0. 0200 Kg/s -0. 0250 -0. 0300 -0. 0350 -0. 0400 -0. 0450 -0. 0500 -0. 051213989 -0. 0550 Sylwia Wojnarska -0. 054389514 12 th July 2012 8
Duct on the bottom – results Sylwia Wojnarska 12 th July 2012 9
Duct on the bottom – results Sylwia Wojnarska 12 th July 2012 10
Thank you for attention! Any questions? Sylwia Wojnarska 12 th July 2012 11
