PS Ventilation Flush mode results with degraded mode

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PS Ventilation - Flush mode results with degraded mode - E. Da Riva, S.

PS Ventilation - Flush mode results with degraded mode - E. Da Riva, S. E. Wojnarska 2013 -02 -07 1

1. CFD simulation set-up E. Da Riva, S. E. Wojnarska 2013 -02 -07 2

1. CFD simulation set-up E. Da Riva, S. E. Wojnarska 2013 -02 -07 2

Boundary conditions / assumptions: Ø Flush mode - Outlet at TR 1 is not

Boundary conditions / assumptions: Ø Flush mode - Outlet at TR 1 is not working. Ø Air flow rates: 21500 m 3 h-1 at Technical Rooms inlets, 5000 m 3 h-1 at the center of the ring. Ø Same pressure at all the air outlets. Ø Air recirculation system off during flushing. Ø Tunnels leaks not taken into account. Ø Buoyancy and heat transfer neglected. Ø Flushing simulations: activated air uniformly distributed at time 0, radiation decay neglected. Ø Turbulence and its influence on diffusivity taken into account. Ø Flushing time – 1 hour Solution strategy: 1. Steady-state simulation to compute the flow field 2. Unsteady simulations taking into account only the flushing of activated air. E. Da Riva, S. E. Wojnarska 2013 -02 -07 3

2. Results for flush mode with TR 1 not working E. Da Riva, S.

2. Results for flush mode with TR 1 not working E. Da Riva, S. E. Wojnarska 2013 -02 -07 4

Conventions Nominal flow rates + + Ø “r 45” means flow rate in the

Conventions Nominal flow rates + + Ø “r 45” means flow rate in the tunnel between the technical room 4 and 5. Ø Flow rate in tunnels (r 12, r 23, etc. ) is positive when counter-clockwise. Ø Flow rate in galleries is positive when moving radially from the ring center to the outside. E. Da Riva, S. E. Wojnarska 2013 -02 -07 5

Inlet layouts Standard Magnet-15 q Flow oriented 15° to the left in the left-half.

Inlet layouts Standard Magnet-15 q Flow oriented 15° to the left in the left-half. q Flow oriented 15° to the right in the right-half. q Flow perpendicular to the inlet. q Flow directed downwards in order to impinge the bottom of the magnet. E. Da Riva, S. E. Wojnarska 2013 -02 -07 6

Pathlines Magnet-15 Standard Ø Air flow rates completely depends on the local geometry in

Pathlines Magnet-15 Standard Ø Air flow rates completely depends on the local geometry in front of technical rooms. Ø Air diffusers are suggested. E. Da Riva, S. E. Wojnarska 2013 -02 -07 7

Pathlines Magnet-15 Standard Ø In Standard very big swirl all around the tunnel Ø

Pathlines Magnet-15 Standard Ø In Standard very big swirl all around the tunnel Ø In Magnet – 15 no flow around the tunnel, and almost no flow near TR 1 E. Da Riva, S. E. Wojnarska 2013 -02 -07 8

Velocities Magnet-15 Standard Ø In Standard model velocity values are much higher. E. Da

Velocities Magnet-15 Standard Ø In Standard model velocity values are much higher. E. Da Riva, S. E. Wojnarska 2013 -02 -07 9

Tunnels flow rates 70000 Nominal case Magnet-15 Standard 60000 Air Flow Rate [m 3/h]

Tunnels flow rates 70000 Nominal case Magnet-15 Standard 60000 Air Flow Rate [m 3/h] 50000 40000 30000 20000 10000 0 -10000 r 12 r 23 r 34 r 45 r 56 r 67 r 78 r 81 -20000 -30000 Ø Magnet is closer to nominal case (except or r 12) Ø Standard – the flow is all counter clock wise, but there is high flow rate. E. Da Riva, S. E. Wojnarska 2013 -02 -07 10

Galleries flow rates and velocities 4000 Magnet-15 3000 Standard 1000 0, 6000 ry 8

Galleries flow rates and velocities 4000 Magnet-15 3000 Standard 1000 0, 6000 ry 8 ry 7 Magnet-15 Standard ga lle ga ry 6 lle ga ry 5 lle ga ry 4 lle ga ry 3 lle ga ga lle -1000 ry 2 0 ry 1 Air Flow Rate [m 3/h] 2000 -2000 0, 5000 -4000 -5000 -6000 Ø The flow rate in the galleries is not stable Ø We can not really trust results for galleries Ø Average velocity is higher in Magnet – 15 Air Velocity [m/s] -3000 0, 4000 0, 3000 0, 2000 0, 1000 E. Da Riva, S. E. Wojnarska 2013 -02 -07 8 lle ga ry lle ry 7 6 ga lle ga ry lle ry 5 4 ga lle ry 3 ga lle ry 2 ga ry lle ga ga lle ry 1 0, 0000 11

Flushing acctivated air - movie Magnet-15 Standard E. Da Riva, S. E. Wojnarska 2013

Flushing acctivated air - movie Magnet-15 Standard E. Da Riva, S. E. Wojnarska 2013 -02 -07 12

Flushing acctivated air Magnet – 15 Standard 0, 9 0, 8 0, 7 0,

Flushing acctivated air Magnet – 15 Standard 0, 9 0, 8 0, 7 0, 6 20, 0 Magnet – 15 0, 5 Standard 18, 0 0, 4 0, 3 0, 2 0, 1 0, 0 0 600 1200 1800 Time [s] 2400 3000 3600 Ø After 30 minutes both models pretend to work well Ø After 1 h much better is Standard with high velocity Volume-Average Dilution Factor [-] Volume-average User Defined Scalar [-] 1, 0 16, 0 14, 0 12, 0 10, 0 8, 0 6, 0 4, 0 2, 0 0 E. Da Riva, S. E. Wojnarska 2013 -02 -07 600 1200 1800 Time [s] 2400 3000 3600 13

Conclusions: Ø Magnet – 15 gives almost no flow in r 12 Ø Standard

Conclusions: Ø Magnet – 15 gives almost no flow in r 12 Ø Standard with high velocities and big swril gives good result Ø We can not trust resutls for the galleries, but flow in the galleries is not so important because there is no air acctivation Ø With Magnet – 15 inlfow layout there is still high amount of acctivated air in the tunnel after 1 hour (specially in the big volume), even though during first 30 minut in this case the part of the tunnel between TR 2 and TR 8 is cleaned better E. Da Riva, S. E. Wojnarska 2013 -02 -07 14

END E. Da Riva, S. E. Wojnarska 2013 -02 -07 15

END E. Da Riva, S. E. Wojnarska 2013 -02 -07 15

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