TABLE I.
Implementation of painting facility parameters in CFD simulations
| Bay Velocity m/s (fpm) | Interior Surface | Boundary Type | Velocity m/s | Contaminant mass fraction | Turbulence intensity | Turbulence length-scale | Turbulence Model |
|---|---|---|---|---|---|---|---|
| 0.549 (108) | SUPPLY FILTER | VELOCITY INLET | 0.6338 | zero | 10% | 1 m | Standard k- ε |
| EXHAUST FILTER | VELOCITY INLET | −1.465 | Not specified | Not specified | Not specified | ||
| SPRAYER HAND | VELOCITY INLET | 1.71 | 0.5 | 10% | 0.1 m | ||
| 0.440 (86.6) | SUPPLY FILTER | VELOCITY INLET | 0.4754 | zero | 10% | 1 m | Standard k- ε |
| EXHAUST FILTER | VELOCITY INLET | −1.174 | Not specified | Not specified | Not specified | ||
| SPRAYER HAND | VELOCITY INLET | 1.71 | 0.5 | 10% | 0.1 (m) | ||
| 0.330 (65.0) | SUPPLY FILTER | VELOCITY INLET | 0.381 | zero | 10% | 1 m | Standard k- ε |
| EXHAUST FILTER | VELOCITY INLET | −0.8816 | Not specified | Not specified | Not specified | ||
| SPRAYER HAND | VELOCITY INLET | 1.71 | 0.5 | 10% | 0.1 m | ||
| 0.220 (43.3) | SUPPLY FILTER | VELOCITY INLET | 0.2540 | 10% | 1 m | Standard k- ε | |
| EXHAUST FILTER | VELOCITY INLET | −0.5877 | Not specified | Not specified | Not specified | ||
| SPRAYER HAND | VELOCITY INLET | 1.71 | 0.5 | 10% | 0.1 (m) | ||
| 0.549/0.330 (108/65.0) | SUPPLY FILTER | VELOCITY INLET | 0.6338 | zero | 10% | 1 m | Standard k- ε |
| EXHAUST FILTER | VELOCITY INLET | −0.8816 | Not specified | Not specified | Not specified | ||
| SPRAYER HAND | VELOCITY INLET | 1.71 | 0.5 | 10% | 0.1 (m) | ||
| 0.508 (100) | SUPPLY FILTER | VELOCITY INLET | 0.5865 | zero | 10% | 1 m | RNG k-ε |
| EXHAUST FILTER | VELOCITY INLET | −1.3563 | Not specified | Not specified | Not specified | ||
| SPRAYER HAND | VELOCITY INLET | 1.71 | 0.5 | 10% | 0.1 m | ||
| 0.381 (75) | SUPPLY FILTER | VELOCITY INLET | 0.4399 | zero | 10% | 1 m | RNG k- ε |
| EXHAUST FILTER | VELOCITY INLET | −1.017 | Not specified | Not specified | Not specified | ||
| SPRAYER HAND | VELOCITY INLET | 1.71 | 0.5 | 10% | 0.1 m | ||
| 0.254 (50) | SUPPLY FILTER | VELOCITY INLET | 0.2933 | zero | 10% | 1 m | RNG k- ε |
| EXHAUST FILTER | VELOCITY INLET | −0.6782 | Not specified | Not specified | Not specified | ||
| SPRAYER HAND | VELOCITY INLET | 1.71 | 0.5 | 10% | 0.1 m |
Notes: The grid of 9,476,802 cells was adapted to a fine grid of 16,241,731 cells (a 42% increase) to test grid independence. Spray nozzle velocity was taken from the manufacturer’s specification of 11 cfm: V = Q/A = 11 cfm/0.00304 m2. Aircraft surfaces and hangar wall, floor, and ceiling were modeled as no-slip walls, except that for the unbalanced flow condition, the ceiling was modeled as a zero-gauge pressure boundary.