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

2. CDS 130 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. CDS 130 FEFLO Model Pre-Processing – CAD  FECAD – Grid generation  FRGEN3D Solution – Flow solution  FEFLO Post-Processing – Visualization  ZFEM

4. CDS 130 Some Examples

5. CDS 130 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. CDS 130 George Mason University, Fairfax, VA We are here

7. CDS 130 Data Topographic and Building data for GMU-Fairfax campus, VA Original data: 5-feet contours Converted to raster (grid) and TIN

8. CDS 130 Mesh from Raster Data

9. CDS 130 Temporal – Raster Contours of concentration @ 140 m above sea level 10 sec100 sec50 sec Concentration

10. CDS 130 Spatial – Raster Contours of concentration @ 100 sec 135 meters145 meters140 meters Concentration

11. CDS 130 Three Dimensional Cloud

12. CDS 130 Footprint

13. CDS 130 Concentration Profiles 1 2 3 4 Average over 180 s 1 2 3 4

14. CDS 130 New York City →

15. CDS 130 Building Airwake

16. CDS 130 One Penn Plaza Building Empire State Building Concentration levels (log scale) Velocity vectors One Plaza Building Empire State Building

17. CDS 130 Velocity at 5 m AGL

18. CDS 130 Comparison: WNW and SW plumes 10 seconds400 seconds700 seconds

19. CDS 130 Iso-concentration

20. CDS 130 Instantaneous Streamlines Wind direction

21. CDS 130 Release Location Plume – Cut Planes Wind direction 1.5 m above the ground 5.2 m above the ground

22. CDS 130 Concentration Level Iso-surface 500 K 4M 31M

23. CDS 130 LPD 17 – San Antonio Class

24. CDS 130 Temperature Iso-Surface

25. CDS 130 Absolute Velocity - Flow Past LPD 17

26. CDS 130

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

28. CDS 130 Smoke – 30 deg – Comparison

29. CDS 130 Particles – 30 deg – No HVAC