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CFD AND VIRTUAL REALITY FOR AIRFLOW VISUALISATION Kjeld Svidt

CFD AND VIRTUAL REALITY FOR AIRFLOW VISUALISATION Kjeld Svidt Dept of Building Technology and Structural Engineering Aalborg University. Contents Background Methods Facilities Cases Results and conclusions. The IT in Civil Engineering group at dept of Building Technology.

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CFD AND VIRTUAL REALITY FOR AIRFLOW VISUALISATION Kjeld Svidt

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  1. CFD AND VIRTUAL REALITY FOR AIRFLOW VISUALISATION Kjeld Svidt Dept of Building Technology and Structural Engineering Aalborg University KJELD SVIDT, AALBORG UNIVERSITY

  2. Contents • Background • Methods • Facilities • Cases • Results and conclusions KJELD SVIDT, AALBORG UNIVERSITY

  3. The IT in Civil Engineering groupat dept of Building Technology • Professor Per Christiansson (1998) (former KBS-Media Lab, Lund University and the IT Bygg program in Sweden) • Assistant Prof. Kjeld Svidt • PhD student Yoke-Chin Lai KJELD SVIDT, AALBORG UNIVERSITY

  4. The IT in Civil Engineering group.Research areas and projects • Virtual Buildings and Collaboration • ’Distributed Virtual Workspace for enhancing Communication within the Construction Industry - DIVERCITY’ (EU IST) • ’It in Collaborative Design’ (Danish Centre for Integrated Design, CID) • Knowledge Nodes for Knowledge Transfer • (SERFIN, Merkurius, e-learning) • Digital Cities and Intelligent Buildings KJELD SVIDT, AALBORG UNIVERSITY

  5. CFD at dept of Building Technology • - indoor environmental engineering group • Airflow in and around buildings • Office buildings • Industrial and livestock buildings • Mechanical, natural and hybrid ventilation • Thermal comfort • Air quality • Energy efficiency KJELD SVIDT, AALBORG UNIVERSITY

  6. CFD Model of Incineration Hall, Amagerforbrænding Outdoor Air Supply Case E-H 67 m 21 m Displacement Ventilation Supply Case C-D 50 m KJELD SVIDT, AALBORG UNIVERSITY

  7. Comparison between Calculated and Measured Results- Amagerforbrænding Vertical Plane at Incineration Line Fill Temperature 52 oC 46 oC 40 oC 34 oC 28 oC 22 oC 16 oC 10 oC 43o 35o 34o 53o 12-18o 30-35o KJELD SVIDT, AALBORG UNIVERSITY

  8. Thermal manikins Ref: Erik Bjørn KJELD SVIDT, AALBORG UNIVERSITY

  9. Airborne transmission of respiratory disease between pig units located at close range (CEPROS) 1% Ref: Bjarne Bjerg, KVL KJELD SVIDT, AALBORG UNIVERSITY

  10. Airborne transmission of respiratory disease between pig units located at close range (CEPROS) 0.2% Ref: Bjarne Bjerg, KVL KJELD SVIDT, AALBORG UNIVERSITY

  11. Airborne transmission of respiratory disease between pig units located at close range (CEPROS) 0.1% Ref: Bjarne Bjerg, KVL KJELD SVIDT, AALBORG UNIVERSITY

  12. Test of VR in a specific project • Research project: “Control of Air Movement in Livestock Buildings” • ... a joint research project between three Danish research groups: • The Royal Veterinary and Agricultural University, Department of Animal Science & Animal Health, Copenhagen, Denmark • Danish Institute of Agricultural Sciences, Department of Agricultural Engineering, Research Centre Bygholm, Horsens, Denmark • Aalborg University, Department of Building Technology and Structural Engineering, Aalborg, Denmark KJELD SVIDT, AALBORG UNIVERSITY

  13. Why livestock buildings • Livestock production an important export industry in Denmark • Increased focus on working environment, indoor air quality, animal welfare • New housing types and production systems • New design tools such as Computational Fluid Dynamics KJELD SVIDT, AALBORG UNIVERSITY

  14. The VR part of the project • One-day information seminar for professionals in the ventilation industry and consultants from the agricultural extension service. • For this seminar, a few cases reflecting research results as well as problem-cases from the industry were selected to be presented in the Virtual Reality facilities at Aalborg University. • Airflow was calculated with the commercial CFD-code Fluent version 5.5. Results were displayed with VU visualisation software (www.cerca.umontreal.ca/vu). • The results were displayed with active stereo in the panorama as well as the six-sided CAVE. KJELD SVIDT, AALBORG UNIVERSITY

  15. What is Virtual Reality ? • Presentations that take place at the VR-Centre ? • Convincing your senses that something virtual is real • Realistic visualisation of phenomena which are difficult to see in reality (e.g. airflow) KJELD SVIDT, AALBORG UNIVERSITY

  16. Virtual Reality may include the following elements: • Stereo viewing (different pictures for right and left eye) • Passive (polarized or colour filter) • Active (shutter glasses) • A certain degree of immersion • Wide screens, power walls • Large curved screens • CAVE • Head mounted displays • Realtime interaction with the model/database • Mouse or keyboard • Tracking of persons or interaction devices • Haptic devices KJELD SVIDT, AALBORG UNIVERSITY

  17. VR facilities at Aalborg University (1) Cave Panorama LightwaveMatrix-Hub Onyx2 IR2 (will be replaced by PC cluster 2003) 3D Auditorium KJELD SVIDT, AALBORG UNIVERSITY

  18. VR facilities at Aalborg University (2) • Panorama • Ø 7.1m, 160°, H 3.5m • Mono & aktive stereo • 28 persons • Tracking KJELD SVIDT, AALBORG UNIVERSITY

  19. VR facilities at Aalborg University (3) • 6-sided CAVE • 2.5m x 2.5m x 2.5m • Back projektion • Aktive stereo • 1 person with tracking,+ a few observers without tracking KJELD SVIDT, AALBORG UNIVERSITY

  20. VR facilities at Aalborg University (4) • Portable equipment • 2.5m x 3.5m • Portable projector and PC • Passive stereo • 30 persons + KJELD SVIDT, AALBORG UNIVERSITY

  21. Cases selected for VR presentation in the project • 3D airflow in a laboratory set-up with an isothermal slot inlet • Airflow and CO2-concentrations in a laboratory set-up with 4 wall inlets and “pig simulators” • Simulation of displacement ventilation in a room with closed pen partitions • Airflow in a similar room with a low momentum ceiling inlet • Airflow in a room with a radial inlet device KJELD SVIDT, AALBORG UNIVERSITY

  22. Air inlet Air exhaust Case 1 3D airflow in a laboratory set-up with an isothermal slot inlet KJELD SVIDT, AALBORG UNIVERSITY

  23. Air velocity at different z-positions during 13 hours (5 min average) - 4.5 m from inlet, 0.2 m below ceiling - the flow changes occasionally between two semi-stable conditions - values seem to be mirrored between z = 0.5 m and z = 4.5 m KJELD SVIDT, AALBORG UNIVERSITY

  24. Case 2 Airflow and CO2 concentration in a laboratory set-up with 4 wall inlets and “pig simulators” Air exhaust Airinlet KJELD SVIDT, AALBORG UNIVERSITY

  25. Air exhaust Airinlet Case 3 – 4 Low momentum airflow in a room with closed pen partitions KJELD SVIDT, AALBORG UNIVERSITY

  26. Air exhaust Airinlet Case 5 Airflow in a room with a radial inlet device KJELD SVIDT, AALBORG UNIVERSITY

  27. Methods of flow visualisation • The presenter could scale and position the model in the 3D environment • He could drag filled contour planes and vector planes arbitrarily through themodel • In addition he could place or drag seed points for streamlines or animated particle tracks in an intuitive way by moving physically around in the model KJELD SVIDT, AALBORG UNIVERSITY

  28. Results and Conclusions • The VR facilities proved to be very efficient to visualise the three-dimensional airflow for people with no special background in 3D modelling and fluid motion • Especially the CAVE gave a very persuasive experience of being inside a virtual room with a virtual airflow • It requires some experience to navigate in the models and to scale and position them in a suitable way in relation to the physical surroundings (the audience, the panorama screen, the walls of the CAVE etc.) KJELD SVIDT, AALBORG UNIVERSITY

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