modelDynamicTwoPhaseFlowRiser

Riser: Dynamic two-phase flow pipe

Information

## Copyright © EDF 2002 - 2026   
## ThermoSysPro Version 4.2

Parameters

Type	Name	Default	Description
Units.SI.Length	L	10.	Pipe length
Units.SI.Diameter	D	0.02	Hydraulic diameter
Units.SI.Length	rugosrel	0.0007	Pipe relative roughness
Integer	ntubes	1	Number of pipes in parallel
Units.SI.Position	z1	0	Pipe inlet altitude
Units.SI.Position	z2	0	Pipe outlet altitude
Real	rgliss	1	Phase slip coefficient
Integer	a	4200	Phase pressure loss coefficient
Real	dpfCorr	1.00	Corrective term for the friction pressure loss (dpf) for each node
Real	hcCorr	1.00	Corrective term for the heat exchange coefficient (hc) for each node
Integer	Ns	10	Number of segments
Units.SI.Temperature[Ns]	T0	fill(300, Ns)	Initial fluid temperature (active if steady_state = false and option_temperature = 1)
Units.SI.SpecificEnthalpy[Ns]	h0	fill(1e5, Ns)	Initial fluid specific enthalpy (active if steady_state = false and option_temperature = 2)
Boolean	inertia	true	true: momentum balance equation with inertia - false: without inertia
Boolean	advection	false	true: momentum balance equation with advection terme - false: without advection terme
Boolean	dynamic_mass_balance	true	true: dynamic mass balance equation - false: static mass balance equation
Boolean	simplified_dynamic_energy_balance	true	true: simplified dynamic energy balance equation - false: full dynamic energy balance equation (active if dynamic_mass_balance=true)
Boolean	steady_state	true	true: start from steady state - false: start from T0 (if option_temperature=1) or h0 (if option_temperature=2)
Integer	option_temperature	1	1:initial temperature is fixed - 2:initial specific enthalpy is fixed (active if steady_state = false)
Boolean	continuous_flow_reversal	true	true: continuous flow reversal - false: discontinuous flow reversal
Integer	mode	0	IF97 region. 1:liquid - 2:steam - 4:saturation line - 0:automatic

Connectors

Type	Name	Default	Description
Connectors.FluidInlet	C1
ThermoSysPro.Thermal.Connectors.ThermalPort[Ns]	CTh1
Connectors.FluidOutlet	C2
ThermoSysPro.Thermal.Connectors.ThermalPort[Ns]	CTh2

Components

Type	Name	Description
Units.SI.AbsolutePressure[N + 1]	P	Fluid pressure in node i
Units.SI.MassFlowRate[N]	Q	Mass flow rate in node i
Units.SI.SpecificEnthalpy[N + 1]	h	Fluid specific enthalpy in node i
Units.SI.SpecificEnthalpy[N]	hb	Fluid specific enthalpy at the boundary of node i
Units.SI.AbsolutePressure[N + 1]	Pb	Bounded fluid pressure in node i
Units.SI.Density[N - 1]	rho1	Fluid density in thermal node i
Units.SI.Density[N]	rho2	Fluid density in hydraulic node i
Units.SI.Density[N + 1]	rhoc	Fluid density at the boudary of node i
Units.SI.Power[N - 1]	dW1	Thermal power exchanged on the liquid side for node i
Units.SI.Power[N - 1]	dW2	Thermal power exchanged on the liquid side for node i
Units.SI.Power	W1t	Total power exchanged on the liquid side
Units.SI.Temperature[N - 1]	Tp1	Wall temperature in node i
Units.SI.Temperature[N - 1]	Tp2	Wall temperature in node i
Units.SI.CoefficientOfHeatTransfer[N - 1]	hi	Fluid heat exchange coefficient in node i
Units.SI.CoefficientOfHeatTransfer[N - 1]	hcl	Fluid heat exchange coefficient in node i for the liquid fraction
Units.SI.CoefficientOfHeatTransfer[N - 1]	hcv	Fluid heat exchange coefficient in node i for the vapor fraction
Real[N - 1]	S	Corrective terme correctif for nucleation removal
Real[N - 1]	E	Corrective term for hcl
Units.SI.CoefficientOfHeatTransfer[N - 1]	heb	Fluid heat exchange coefficient for vaporization in thermal node i
Units.SI.ReynoldsNumber[N - 1]	Rel1	Reynolds number in thermal node i for the liquid
Units.SI.ReynoldsNumber[N]	Rel2	Reynolds number in hydraulic node i for the liquid
Units.SI.ReynoldsNumber[N - 1]	Rev1	Reynolds number in thermal node i for the vapor
Units.SI.ReynoldsNumber[N]	Rev2	Reynolds number in hydraulic node i for the vapor
Real[N - 1]	Prl	Fluid Prandtl number in node i for the liquid
Real[N - 1]	Prv	Fluid Prandtl number in node i for the vapor
Units.SI.ThermalConductivity[N - 1]	kl	Thermal conductivity in node i for the liquid
Units.SI.ThermalConductivity[N - 1]	kv	Thermal conductivity in node i for the vapor
Real[N - 1]	xv1	Vapor mass fraction in thermal node i
Real[N]	xv2	Vapor mass fraction in hydraulic node i
Real[N - 1]	xbs	Bounded upper value for the vapor mass fraction
Real[N - 1]	xbi	Bounded lower value for the vapor mass fraction
Units.SI.DynamicViscosity[N - 1]	mul1	Dynamic viscosity in thermal node i for the liquid
Units.SI.DynamicViscosity[N]	mul2	Dynamic viscosity in hydraulic node i for the liquid
Units.SI.DynamicViscosity[N - 1]	muv1	Dynamic viscosity in thermal node i for the vapor
Units.SI.DynamicViscosity[N]	muv2	Dynamic viscosity in hydraulic node i for the vapor
Units.SI.SpecificHeatCapacity[N - 1]	cpl	Specific heat capacity for the liquid
Units.SI.SpecificHeatCapacity[N - 1]	cpv	Specific heat capacity for the vapor
Real[N - 1]	Bo	Boiling number
Real[N - 1]	Xtt	Martinelli number
Units.SI.SpecificEnthalpy[N - 1]	lv	Specific enthalpy for vaporisation
Units.SI.Density[N - 1]	rhol1	Fluid density in thermal node i for the liquid
Units.SI.Density[N]	rhol2	Fluid density in hydraulic node i for the liquid
Units.SI.Density[N - 1]	rhov1	Fluid density in thermal node i for the vapor
Units.SI.Density[N]	rhov2	Fluid density in hydraulic node i for the vapor
Units.SI.Temperature[N - 1]	T1	Fluid temperature in thermal node i
Units.SI.Temperature[N]	T2	Fluid temperature in hydraulic node i
ThermoSysPro.Units.SI.PressureDifference[N]	dpa	Advection term for the mass balance equation in node i
ThermoSysPro.Units.SI.PressureDifference[N]	dpf	Friction pressure loss in node i
ThermoSysPro.Units.SI.PressureDifference[N]	dpg	Gravity pressure loss in node i
Real[N]	khi	Hydraulic pressure loss coefficient in node i
Real[N]	lambdal	Friction pressure loss coefficient in node i for the liquid
Real[N]	lambdav	Friction pressure loss coefficient in node i for the vapor)
Real[N]	filo	Pressure loss coefficient for two-phase flow
ThermoSysPro.Properties.WaterSteam.Common.ThermoProperties_ph[N - 1]	pro1
ThermoSysPro.Properties.WaterSteam.Common.ThermoProperties_ph[2]	proc
ThermoSysPro.Properties.WaterSteam.Common.ThermoProperties_ph[N]	pro2
ThermoSysPro.Properties.WaterSteam.Common.PropThermoSat[N]	vsat2
ThermoSysPro.Properties.WaterSteam.Common.PropThermoSat[N]	lsat2
ThermoSysPro.Properties.WaterSteam.Common.PropThermoSat[N - 1]	vsat1
ThermoSysPro.Properties.WaterSteam.Common.PropThermoSat[N - 1]	lsat1

Revisions

Authors  

Baligh El Hefni  
Daniel Bouskela