CFD simulations and boundary conditions.
| Model type . | Single-port toilet . | Double-port toilet . |
|---|---|---|
| Mesh number | 17 708 | 19 135 |
| Materials | Water–liquid (primary phase), air (secondary phase) | |
| Operating conditions | Pressure: 101 325 Pa, air density: 1.225 kg/m3 | |
| Pressure-inlet αa = 1, gauge total pressure 0 Pa. Turbulence specification method: | ||
| Inlet | intensity and hydraulic diameter, with turbulent intensity 5% and hydraulic diameter 0.18 m. | |
| Inlets 1 and 2 have the same boundary conditions for both toilets | ||
| Pressure-outlet αa = 1. Backflow pressure specification: | ||
| Outlet 1 | total pressure. Turbulence specification method: intensity and hydraulic diameter, | |
| with turbulent intensity 5% and hydraulic diameter 0.4 m. Escape boundary type | ||
| Pressure-outlet αa = 1. Backflow pressure specification: | ||
| Outlet 2 | total pressure. Turbulence specification method: intensity and hydraulic diameter, | |
| with turbulent intensity 5% and hydraulic diameter 0.035 m. Escape boundary type | ||
| Bowl | No-slip wall boundary, reflect boundary type | |
| Aerosol particle14,34,35 | Particle diameter 8.6 µm, total number 6000, particle density 1100 kg/m3 | |
| Model type . | Single-port toilet . | Double-port toilet . |
|---|---|---|
| Mesh number | 17 708 | 19 135 |
| Materials | Water–liquid (primary phase), air (secondary phase) | |
| Operating conditions | Pressure: 101 325 Pa, air density: 1.225 kg/m3 | |
| Pressure-inlet αa = 1, gauge total pressure 0 Pa. Turbulence specification method: | ||
| Inlet | intensity and hydraulic diameter, with turbulent intensity 5% and hydraulic diameter 0.18 m. | |
| Inlets 1 and 2 have the same boundary conditions for both toilets | ||
| Pressure-outlet αa = 1. Backflow pressure specification: | ||
| Outlet 1 | total pressure. Turbulence specification method: intensity and hydraulic diameter, | |
| with turbulent intensity 5% and hydraulic diameter 0.4 m. Escape boundary type | ||
| Pressure-outlet αa = 1. Backflow pressure specification: | ||
| Outlet 2 | total pressure. Turbulence specification method: intensity and hydraulic diameter, | |
| with turbulent intensity 5% and hydraulic diameter 0.035 m. Escape boundary type | ||
| Bowl | No-slip wall boundary, reflect boundary type | |
| Aerosol particle14,34,35 | Particle diameter 8.6 µm, total number 6000, particle density 1100 kg/m3 | |