STUDY OF THE AIR TEMPERATURE AND VELOCITY AROUND THE ATLAS MUON CHAMBERS Emma Vigo Castellvi ST/CV Design.

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Presentation transcript:

STUDY OF THE AIR TEMPERATURE AND VELOCITY AROUND THE ATLAS MUON CHAMBERS Emma Vigo Castellvi ST/CV Design

CONTENTS Situation of the Problem Solution methodology (CFD) Boundary Conditions The Previous Model The LMCh5 Model The Closed Model Conclusions Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001

SITUATION OF THE PROBLEM Types: – BIS, BIL – BMS, BML – BOS, BOL Concerned by: – Temperature – Air velocities THE ATLAS BARREL MUON CHAMBERS Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001

CONTENTS Situation of the Problem Solution methodology (CFD) Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001

SOLUTION METHODOLOGY (CFD) CFD (Computational Fluid Dynamic) is a method allowing to simulate on computer a wide range of phenomena linked to fluid mechanic (flow analysis, thermodynamic, heat transfer...) Fluid mechanics equations numerically solved Domain splitted into cells Flow behaviour spatially uniform Physical gradients Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001 cell+neighbours discretisation or mesh

THE MESH 100’000 elements Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001

CONTENTS Situation of the Problem Solution Methodology (CFD) Boundary Conditions Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001

THE UX15 VENTILATION SYSTEM BOUNDARY CONDITIONS Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001

BOUNDARY CONDITIONS THE 2D “SECTION” Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001

CONTENTS Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001 Situation of the Problem Solution methodology (CFD) Boundary Conditions The Previous Model

Results: Quite optimistic Middle axis chambers: most solicitated Minor influence of the racks Problems: MDT’s heat load: 30mmW/channel Not distributed inlet THE PREVIOUS MODEL (LMCh3) Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001

CONTENTS Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001 Situation of the Problem Solution methodology (CFD) Boundary Conditions The Previous Model The LMCh5 Model

NEWS LMCh5 MODEL Heat load of the MDTs’ electronics Distributed inlet Transient calculation Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001

BOUNDARY CONDITIONS LMCh5 MODEL Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001

BOUNDARY CONDITIONS LMCh5 MODEL ( * ) corresponding to 65mW/channel Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001

6000sec : TEMPERATURE MAP LMCh5 MODEL

Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October sec : VELOCITY MAP LMCh5 MODEL

CONTENTS Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001 Situation of the Problem Solution methodology (CFD) Boundary Conditions The Previous Model The LMCh5 Model The Closed Model

WHAT’S NEXT? Gaps between chambers: closed + porosity MCh: solids with conduction RPC’s non conducting heating surfaces Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001 Status: - Geometry completely finished - Geometry successfully transferred to StarCD - At present: definition of new boundary conditions

CMCh MODEL Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001

CONTENTS Situation of the Problem Solution methodology (CFD) Boundary Conditions The Previous Model The LMCh5 Model The Closed Model Conclusions Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001

CONCLUSIONS Global understanding of the case study Velocity doesn’t reach high values Temperature gradients could be over the constraints Medium axis chambers: most solicitated being done Closed Muon Chambers (CMCh) study being done Next step Next step: 3D simplified model Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001

STUDY OF THE AIR TEMPERATURE AND VELOCITY AROUND THE ATLAS MUON CHAMBERS Emma Vigo Castellvi ST/CV Design Study of the Air Temperature and Velocity Around the ATLAS Muon Chambers Emma Vigo, ST/CV, 15 October 2001 See also: