| Integer | N (from Flow1DBase) | 2 | Number of nodes for thermal variables |
| Integer | Nw (from Flow1DBase) | N - 1 | Number of volumes on the wall interface |
| Integer | Nt (from Flow1DBase) | 1 | Number of tubes in parallel |
| SI.Distance | L (from Flow1DBase) | | Tube length |
| SI.Position | H (from Flow1DBase) | 0 | Elevation of outlet over inlet |
| SI.Area | A (from Flow1DBase) | | Cross-sectional area (single tube) |
| SI.Length | omega (from Flow1DBase) | | Perimeter of heat transfer surface (single tube) |
| SI.Length | Dhyd (from Flow1DBase) | | Hydraulic Diameter (single tube) |
| Medium.MassFlowRate | wnom (from Flow1DBase) | | Nominal mass flowrate (total) |
| ThermoPower.Choices.Flow1D.FFtypes | FFtype (from Flow1DBase) | ThermoPower.Choices.Flow1D.FFtypes.NoFriction | Friction Factor Type |
| SI.PressureDifference | dpnom (from Flow1DBase) | 0 | Nominal pressure drop |
| Real | Kfnom (from Flow1DBase) | 0 | Nominal hydraulic resistance coefficient |
| Medium.Density | rhonom (from Flow1DBase) | 0 | Nominal inlet density |
| SI.PerUnit | Cfnom (from Flow1DBase) | 0 | Nominal Fanning friction factor |
| SI.PerUnit | e (from Flow1DBase) | 0 | Relative roughness (ratio roughness/diameter) |
| Real | Kfc (from Flow1DBase) | 1 | Friction factor correction coefficient |
| Boolean | DynamicMomentum (from Flow1DBase) | false | Inertial phenomena accounted for |
| Boolean | UniformComposition (from Flow1DBase) | true | Uniform gas composition is assumed |
| Boolean | QuasiStatic (from Flow1DBase) | false | Quasi-static model (mass, energy and momentum static balances |
| HCtypes | HydraulicCapacitance (from Flow1DBase) | HCtypes.Downstream | 1: Upstream, 2: Downstream |
| Boolean | avoidInletEnthalpyDerivative (from Flow1DBase) | true | Avoid inlet enthalpy derivative |
| Boolean | allowFlowReversal (from Flow1DBase) | system.allowFlowReversal | = true to allow flow reversal, false restricts to design direction |
| SI.Velocity | unom (from Flow1DBase) | 10 | Nominal velocity for simplified equation |
| Real | wnf (from Flow1DBase) | 0.01 | Fraction of nominal flow rate at which linear friction equals turbulent friction |
| SI.PerUnit | wnm (from Flow1DFV) | 1e-2 | Maximum fraction of the nominal flow rate allowed as reverse flow |
| SI.CoefficientOfHeatTransfer | gamma_nom | | Nominal h.t.c. coefficient |
| Real | kw | | Exponent of the mass flow rate in the h.t.c. correlation |
| Initialisation |
| Medium.AbsolutePressure | pstart (from Flow1DBase) | 1e5 | Pressure start value |
| Medium.Temperature | Tstartbar (from Flow1DBase) | 300 | Avarage temperature start value |
| Medium.Temperature | Tstartin (from Flow1DBase) | Tstartbar | Inlet temperature start value |
| Medium.Temperature | Tstartout (from Flow1DBase) | Tstartbar | Outlet temperature start value |
| Medium.Temperature[N] | Tstart (from Flow1DBase) | linspace(Tstartin, Tstartout, N) | Start value of temperature vector (initialized by default) |
| Medium.MassFraction[nX] | Xstart (from Flow1DBase) | Medium.reference_X | Start gas composition |
| Choices.Init.Options | initOpt (from Flow1DBase) | system.initOpt | Initialisation option |
| Boolean | noInitialPressure (from Flow1DBase) | false | Remove initial equation on pressure |
| Boolean | fixedMassFlowSimplified (from Flow1DFV) | false | Fix flow rate = wnom for simplified homotopy model |
