CDS 130 Fernando E. Camelli Department of Computational and Data Sciences George Mason University Web:

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

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

CDS 130 Some Examples

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

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

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

CDS 130 Mesh from Raster Data

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

CDS 130 Spatial – Raster Contours of 100 sec 135 meters145 meters140 meters Concentration

CDS 130 Three Dimensional Cloud

CDS 130 Footprint

CDS 130 Concentration Profiles Average over 180 s

CDS 130 New York City →

CDS 130 Building Airwake

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

CDS 130 Velocity at 5 m AGL

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

CDS 130 Iso-concentration

CDS 130 Instantaneous Streamlines Wind direction

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

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

CDS 130 LPD 17 – San Antonio Class

CDS 130 Temperature Iso-Surface

CDS 130 Absolute Velocity - Flow Past LPD 17

CDS 130

T-AKE 1 – Dry Cargo/Ammunition Ship

CDS 130 Smoke – 30 deg – Comparison

CDS 130 Particles – 30 deg – No HVAC