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11
Peak shelter zone (~5–
–1,500 ft): Maximum near-surface suppression (50–80% or
greater reduction), forming broad low-shear recirculation ideal for minimizing entrainment from
30–50 ft high stockpiles.
Gradual recovery (beyond 15H): Velocities increase progressively as higher-level momentum
–
–2,000 ft), reductions may fall to 20–40% or less—still
offering partial benefits but with diminishing returns on dust generation control.
In the Newport News terminal context:
A 100 ft fence along southern/southwestern perimeters would provide stronger, more uniform
central/northern stockpiles and extending toward northeast/east receptors.
The gradual velocity recovery ensures that even at the farther edges of the site, near-surface
winds remain notably lower than baseline, further reducing fugitive dust potential compared to the
80 ft option.
CFD simulations will directly compare the two heights, quantifying velocity fields, turbulent kinetic
energy, shear stress on pile surfaces, and particle dispersion trajectories across configurations
(full enclosure, U-shaped, targeted segments).
This comparative analysis evaluates whether the additional height yields proportional gains in dust
transport reduction, balanced against increased structural demands, and operational considerations—
providing data-driven insights for optimal fence design at the coal terminals.
A 3-D model of the area was created by DSI for implementation in Solidworks Flow. This can be seen on
the next page.
Figure 2 (Wind direction related to the pile)
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