Common Combinations

Pressure-velocity systems

Subsonic

Incompressible

Inlet Outlet Stability
PhysicsOpenFOAMPhysicsOpenFOAM
Volume flow rateflowRateVelocity Static pressurefixedValue Excellent
Total pressuretotalPressure Total pressuretotalPressure Very good
Total pressuretotalPressure Static pressurefixedValue Good
Static pressurefixedValue Static pressurefixedValue Poor

Compressible

Inlet Outlet Stability
PhysicsOpenFOAMPhysicsOpenFOAM
Mass flow rateflowRateVelocity Static pressurefixedValue Excellent
Total pressuretotalPressure Total pressuretotalPressure Very good
Total pressure totalPressure Static pressurefixedValue Good
Static pressurefixedValue Static pressurefixedValue 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

Supersonic

Heat transfer

Walls

Type Condition
Adiabatic zeroGradient
Fixed temperature fixedValue
Fixed heat flux fixedGradient

Mesh motion

Type Condition
Moving wall

movingWallVelocity

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