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CDS 130

CDS 130. Fernando E. Camelli Department of Computational and Data Sciences George Mason University E-mail: fcamelli@gmu.edu Web :. Atmospheric Dispersion. Study flow around buildings Study flow around ships Patterns/footprint of clouds of materials Tools: CAD: Computer Aided Design

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CDS 130

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  1. CDS 130 Fernando E. Camelli Department of Computational and Data Sciences George Mason University E-mail: fcamelli@gmu.edu Web:

  2. Atmospheric Dispersion • Study flow around buildings • Study flow around ships • Patterns/footprint of clouds of materials • Tools: • CAD: Computer Aided Design • CFD: Computational Fluid Dynamics • Visualization

  3. FEFLO Model • Pre-Processing • CAD  FECAD • Grid generation  FRGEN3D • Solution • Flow solution  FEFLO • Post-Processing • Visualization  ZFEM

  4. Some Examples

  5. Inputs for CFD Models • Topography of landscape • Building heights with footprints (locations) • Other characteristics: • Surface roughness • Vegetative covers • Building materials • Data are 3D in nature • Some are commonly stored in GIS

  6. We are here George Mason University, Fairfax, VA

  7. Data • Topographic and Building data for GMU-Fairfax campus, VA • Original data: 5-feet contours • Converted to raster (grid) and TIN

  8. Mesh from Raster Data

  9. Temporal – Raster Concentration 10 sec 50 sec 100 sec Contours of concentration @ 140 m above sea level

  10. Spatial – Raster Concentration 135 meters 140 meters 145 meters Contours of concentration @ 100 sec

  11. Three Dimensional Cloud

  12. Footprint

  13. Concentration Profiles 1 2 Average over 180 s 1 3 2 4 3 4

  14. New York City →

  15. BuildingAirwake

  16. One Penn Plaza BuildingEmpire State Building Velocity vectors One Plaza Building Empire State Building Concentration levels (log scale)

  17. Velocity at 5 m AGL

  18. Comparison: WNW and SW plumes 10 seconds 400 seconds 700 seconds

  19. Iso-concentration

  20. Instantaneous Streamlines Wind direction

  21. Release Location Wind direction Plume – Cut Planes 5.2 m above the ground 1.5 m above the ground

  22. Concentration Level Iso-surface 500 K 4M 31M

  23. LPD 17 – San Antonio Class

  24. Temperature Iso-Surface

  25. Absolute Velocity - Flow Past LPD 17

  26. T-AKE 1 – Dry Cargo/Ammunition Ship

  27. Smoke – 30 deg – Comparison

  28. Particles – 30 deg – No HVAC

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