# Boundary Conditions Specification
# Centrifugal Blood Pump CFD Analysis
# Morrison et al. (2019)
# ──────────────────────────────────────────────────────

## Operating Conditions

| Parameter              | COU1 (CPB)           | COU2 (VAD)           |
|------------------------|----------------------|----------------------|
| Intended Use           | Cardiopulmonary      | Ventricular Assist   |
|                        | Bypass (short-term)  | Device (long-term)   |
| Device Classification  | Class II             | Class III            |
| Flow Rate              | 5.0 LPM             | 5.0 LPM             |
| Rotational Speed       | 3000 RPM             | 3000 RPM             |
| Blood Temperature      | 37°C                 | 37°C                 |
| Duration of Use        | Hours                | Months–Years         |
| Hemolysis Threshold    | MIH relative to      | MIH absolute, with   |
|                        | predicate device     | long-term cumulative |
|                        |                      | damage consideration |

## Dimensional Tolerance Variations Studied

| Component Feature       | Nominal (mm) | Tolerance (mm) | Configurations Tested |
|------------------------|--------------|----------------|-----------------------|
| Impeller-Housing Gap   | 0.50         | ±0.10          | 5 levels              |
| Volute Cutwater Gap    | 1.20         | ±0.20          | 5 levels              |
| Inlet Guide Angle      | 30.0°        | ±3.0°          | 3 levels              |
| Impeller Blade Tip     | 0.30         | ±0.05          | 3 levels              |

## Fluid Properties (Blood Analog)

| Property               | Value                | Source                |
|------------------------|----------------------|-----------------------|
| Density                | 1056 kg/m³           | Published literature  |
| Dynamic Viscosity      | 0.0035 Pa·s          | Newtonian assumption  |
| Hematocrit             | 40%                  | Standard test value   |
| Temperature            | 37°C ± 0.5°C         | Controlled water bath |

## Notes
- Newtonian blood model used; non-Newtonian effects assumed negligible
  at shear rates > 100 s⁻¹ (typical in centrifugal pumps)
- Rigid wall assumption; vessel compliance not modeled
- Gravity effects neglected (horizontal pump orientation)
