.ThermoCycle.Components.FluidFlow.Pipes.Flow1Dim_MD

Information

Model Flow1Dim_2ph describes the flow of fluid through a discretized one dimentional tube.

Enthalpy and pressure are selected as state variable

In the model the node variables are characterized by the following syntax: _node.

The model is discretized using the collocated grid method: the nodes variable are the state variables and the cell variable are deduced

UpWind discretization is considered i.e. h_node[j+1] = h_node[j].

Numerical options

In this tab several options are available to make the model more robust:

• Mdotconst: assume constant mass flow rate at each node.
• max_der: if true the density derivative is truncated during phase change
• filter_dMdt: if true a first order filter is applied to the fast variations of the density with respect to time
• max_drhodt: it represents the maximum value of the density derivative. It activates when using max_der is set to true
• TT: it represents the integration time of the first order filter. It activates when filter_dMdt is set to true

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

• Temperature at the center of each cell
• Temperature at each node
• 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 each nodes
• Pressure in the tube

The model is based on:

Casella, F. Object-oriented modelling of two-phase fluid flows by the finite volume method. Proceedings 5th Mathmod Vienna, Austria, Sep 2006, p. 68.

Contents

Name	Description
Medium
SummaryClass