modelFlow1Dim

1-D fluid flow model (finite volume discretization - real fluid model). Based on the cell component

Information

This model describes the flow of fluid through a discretized one dimentional tube. It is obtained by connecting in series N Cell1Dim. The resulting discretization scheme is of the staggered type i.e. state variables are computed at the center of each cell and the node variables are calculated depending on the local discretization (Upwind or Central difference).

The Modelling options and the Numerical options are the same as the one presented in the Cell1D model documentation.

The model is characterized by a SummaryClass that provide a quick access to the following variables once the model is simulated:

Enthalpy at each node
Enthalpy at the center of each cell
Density at the center of each cell
Massflow at each nodes
Vapor quality at the center of each cell
Pressure in the tube

Parameters

Type	Name	Default	Description
Integer	Nt	1	Number of cells in parallel
Real	pi	Modelica.Constants.pi	pi-greco
Integer	N	10	Number of cells
Modelica.SIunits.Area	A	16.18	Lateral surface of the tube: heat exchange area
Modelica.SIunits.Volume	V	0.03781	Volume of the tube
Modelica.SIunits.Volume	Vi	V/N	Volume of a single cell
Modelica.SIunits.Area	Ai	A/N	Lateral surface of a single cell
Modelica.SIunits.MassFlowRate	Mdotnom	0.2588	Nominal fluid flow rate
Modelica.SIunits.CoefficientOfHeatTransfer	Unom_l	100	if HTtype = LiqVap : Heat transfer coefficient, liquid zone
Modelica.SIunits.CoefficientOfHeatTransfer	Unom_tp	100	if HTtype = LiqVap : heat transfer coefficient, two-phase zone
Modelica.SIunits.CoefficientOfHeatTransfer	Unom_v	100	if HTtype = LiqVap : heat transfer coefficient, vapor zone
Initialization
Modelica.SIunits.Pressure	pstart		Fluid pressure start value
Medium.Temperature	Tstart_inlet		Inlet temperature start value
Medium.Temperature	Tstart_outlet		Outlet temperature start value
Medium.SpecificEnthalpy[N]	hstart	linspace(Medium.specificEnthalpy_pT(pstart, Tstart_inlet), Medium.specificEnthalpy_pT(pstart, Tstart_outlet), N)	Start value of enthalpy vector (initialized by default)
Numerical options
Discretizations	Discretization	ThermoCycle.Functions.Enumerations.Discretizations.centr_diff	Selection of the spatial discretization scheme
Boolean	Mdotconst	false	Set to yes to assume constant mass flow rate at each node (easier convergence)
Boolean	max_der	false	Set to yes to limit the density derivative during phase transitions
Boolean	filter_dMdt	false	Set to yes to filter dMdt with a first-order filter
Real	max_drhodt	100	Maximum value for the density derivative
Modelica.SIunits.Time	TT	1	Integration time of the first-order filter
Initialization › Intialization options
Boolean	steadystate	true	if true, sets the derivative of h (working fluids enthalpy in each cell) to zero during Initialization

Connectors

Type	Name	Default	Description
ThermoCycle.Interfaces.Fluid.FlangeA	InFlow
ThermoCycle.Interfaces.Fluid.FlangeB	OutFlow
ThermoCycle.Interfaces.HeatTransfer.ThermalPort	Wall_int

Components

Type	Name	Description
SummaryClass	Summary
Modelica.SIunits.Power	Q_tot	Total heat flux exchanged by the thermal port
Modelica.SIunits.Mass	M_tot	Total mass of the fluid in the component
Medium.SaturationProperties	sat	Calculation of the saturation properties here to avoid calculating in every cell
ThermoCycle.Components.FluidFlow.Pipes.Cell1Dim[N]	Cells
Interfaces.HeatTransfer.ThermalPortConverter	thermalPortConverter

Name	Description
Medium
SummaryClass
Flow1DimHeatTransferModel

modelFlow1Dim

Information

Parameters

Connectors

Components

Contents