Common combinations
Pressure-velocity systems
Incompressible
| Inlet | Outlet | Stability | ||
|---|---|---|---|---|
| Physics | OpenFOAM | Physics | OpenFOAM | |
| Volume flow rate | flowRateInletVelocity | Static pressure | fixedValue | Excellent |
| Total pressure | totalPressure | Total pressure | totalPressure | Very good |
| Total pressure | totalPressure | Static pressure | fixedValue | Good |
| Static pressure | fixedValue | Static pressure | fixedValue | Poor |
Compressible
| Inlet | Outlet | Stability | ||
|---|---|---|---|---|
| Physics | OpenFOAM | Physics | OpenFOAM | |
| Mass flow rate | flowRateInletVelocity | Static pressure | fixedValue | Excellent |
| Total pressure | totalPressure | Total pressure | totalPressure | Very good |
| Total pressure | totalPressure | Static pressure | fixedValue | Good |
| Static pressure | fixedValue | Static pressure | fixedValue | Poor |
Return flow options
| Type | Condition | Stability |
|---|---|---|
| Outflow | zeroGradient | Unstable if flow reverses |
| Blocked | inletOutlet | Good, but unphysical |
| Return flow I | pressureInletOutlet | Good |
| Return flow II | totalPressure | Very good |
Heat transfer
Walls
| Type | Condition |
|---|---|
| Adiabatic | zeroGradient |
| Fixed temperature | fixedValue |
| Fixed heat flux | fixedGradient |
Mesh motion
Walls
| Type | Condition |
|---|---|
| Moving wall | movingWallVelocity |